add: basic webrtc is working

buf.gen.yaml

@@ -10,5 +10,6 @@ plugins:
   - plugin: buf.build/connectrpc/go
     out: gen
     opt: paths=source_relative
-  - plugin: buf.build/protocolbuffers/dart:v21.1.1
+  - plugin: dart
-    out: gen
+    out: ui/lib/gen
+    opt: grpc

cmd/signaler/main.go

@@ -8,6 +8,9 @@ import (
 	"connectrpc.com/grpcreflect"
 	servicepb "github.com/chathaway-codes/home-sensors/v2/gen/genconnect"
 	"github.com/chathaway-codes/home-sensors/v2/pkg/signaler"
+	"github.com/rs/cors"
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/h2c"
 )
 
 func main() {
@@ -26,7 +29,40 @@ func main() {
 	fmt.Printf("Got path %s\n", path)
 	mux.Handle(servicepb.NewSignalerServiceHandler(signaler.New()))
 
-	if err := http.ListenAndServe("127.0.0.1:8080", mux); err != nil {
+	corsHandler := cors.New(cors.Options{
+		AllowedMethods: []string{
+			http.MethodGet,
+			http.MethodPost,
+		},
+		AllowedOrigins: []string{"example.com"},
+		AllowedHeaders: []string{
+			"Accept-Encoding",
+			"Authorization",
+			"Content-Encoding",
+			"Content-Type",
+			"Connect-Protocol-Version",
+			"Connect-Timeout-Ms",
+			"Connect-Accept-Encoding",  // Unused in web browsers, but added for future-proofing
+			"Connect-Content-Encoding", // Unused in web browsers, but added for future-proofing
+			"Grpc-Timeout",             // Used for gRPC-web
+			"X-Grpc-Web",               // Used for gRPC-web
+			"X-User-Agent",             // Used for gRPC-web
+		},
+		ExposedHeaders: []string{
+			"Content-Encoding",         // Unused in web browsers, but added for future-proofing
+			"Connect-Content-Encoding", // Unused in web browsers, but added for future-proofing
+			"Grpc-Status",              // Required for gRPC-web
+			"Grpc-Message",             // Required for gRPC-web
+		},
+	})
+	handler := corsHandler.Handler(mux)
+
+	server := &http.Server{
+		Addr:    "0.0.0.0:8080",
+		Handler: h2c.NewHandler(handler, &http2.Server{}),
+	}
+
+	if err := server.ListenAndServe(); err != nil {
 		log.Fatalf("Failed to listen for HTTP traffic: %v", err)
 	}
 }

cmd/watcher/main.go

@@ -5,39 +5,61 @@ package main
 
 import (
 	"context"
+	"errors"
+	"flag"
 	"fmt"
 	"io"
 	"log"
 	"net/http"
 	"os"
+	"sync"
 	"time"
 
 	"connectrpc.com/connect"
 	pb "github.com/chathaway-codes/home-sensors/v2/gen"
 	servicepb "github.com/chathaway-codes/home-sensors/v2/gen/genconnect"
+	"github.com/google/uuid"
 	"github.com/pion/webrtc/v3"
 	"github.com/pion/webrtc/v3/pkg/media"
-	"github.com/pion/webrtc/v3/pkg/media/h264reader"
+	"github.com/pion/webrtc/v3/pkg/media/ivfreader"
+	"google.golang.org/protobuf/encoding/prototext"
 	"google.golang.org/protobuf/proto"
 )
 
-const (
+var (
-	videoFileName     = "/home/charles/Downloads/simpsons_movie_1080p_hddvd_trailer/The Simpsons Movie - 1080p Trailer.mp4"
+	videoFileName = flag.String("in", "/home/charles/Downloads/simpsons_movie_1080p_hddvd_trailer/output.ivf", "Where to load data from; if set to -, stdin will be used")
-	oggPageDuration   = time.Millisecond * 20
-	h264FrameDuration = time.Millisecond * 33
 )
 
 func withAuth[T any](token string, v *T) *connect.Request[T] {
 	req := connect.NewRequest[T](v)
-	req.Header().Add("authorization", "Bearer "+token)
+	req.Header().Add("Authorization", "Bearer "+token)
 	return req
 }
 
 func main() { //nolint
+	flag.Parse()
 	ctx := context.Background()
-	httpClient := &http.Client{}
+
-	client := servicepb.NewSignalerServiceClient(httpClient, "http://localhost:8080/")
+	/*httpClient := &http.Client{
+		Transport: &http2.Transport{
+			AllowHTTP: true,
+			DialTLS: func(network, addr string, _ *tls.Config) (net.Conn, error) {
+				// If you're also using this client for non-h2c traffic, you may want
+				// to delegate to tls.Dial if the network isn't TCP or the addr isn't
+				// in an allowlist.
+				log.Printf("Connecting to %s : %s", network, addr)
+				return net.Dial(network, addr)
+			},
+			// Don't forget timeouts!
+		},
+	}*/
+	vid, err := newVideo(ctx)
+	if err != nil {
+		log.Fatalf("Failed to start video: %v", err)
+	}
+	client := servicepb.NewSignalerServiceClient(http.DefaultClient, "http://192.168.0.65:8080/")
 	authToken, err := client.CreateAuthToken(ctx, connect.NewRequest(&pb.CreateAuthTokenRequest{
+		Home: "home1234",
 		Type: &pb.CreateAuthTokenRequest_Camera_{
 			Camera: &pb.CreateAuthTokenRequest_Camera{
 				Id: "movie",
@@ -48,20 +70,113 @@ func main() { //nolint
 		log.Fatalf("Failed to get auth token: %v", err)
 	}
 	token := authToken.Msg.GetToken()
-
+	log.Printf("Got token %s", prototext.Format(authToken.Msg))
-	// Assert that we have an audio or video file
-	_, err = os.Stat(videoFileName)
-	haveVideoFile := !os.IsNotExist(err)
-
-	iceConnectedCtx, iceConnectedCtxCancel := context.WithCancel(context.Background())
 
 	// Create a new RTCPeerConnection
+	log.Printf("Waiting for connections")
 
+	for {
 		// Wait for a session request
 		session, err := client.PopSession(ctx, withAuth(token, &pb.PopSessionRequest{}))
 		if err != nil {
 			log.Fatalf("error creating session: %v", err)
 		}
+		go handleSession(ctx, client, token, session, vid)
+	}
+}
+
+type video struct {
+	mu        sync.Mutex
+	listeners map[string]chan<- []byte
+	codec     string
+}
+
+func newVideo(ctx context.Context) (*video, error) {
+	var err error
+	// Assert that we have an audio or video file
+	videoFileName := *videoFileName
+	var videoIn io.Reader
+	if videoFileName == "-" {
+		videoIn = os.Stdin
+	} else {
+		videoIn, err = os.Open(videoFileName)
+		if err != nil {
+			return nil, fmt.Errorf("failed to open %q: %v", videoFileName, err)
+		}
+
+	}
+
+	ivf, header, err := ivfreader.NewWith(videoIn)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read video: %v", err)
+	}
+
+	// Determine video codec
+	var trackCodec string
+	switch header.FourCC {
+	case "AV01":
+		trackCodec = webrtc.MimeTypeAV1
+	case "VP90":
+		trackCodec = webrtc.MimeTypeVP9
+	case "VP80":
+		trackCodec = webrtc.MimeTypeVP8
+	default:
+		return nil, fmt.Errorf("unable to handle FourCC %s", header.FourCC)
+	}
+
+	vid := &video{
+		listeners: make(map[string]chan<- []byte),
+		codec:     trackCodec,
+	}
+	go func() {
+		// Send our video file frame at a time. Pace our sending so we send it at the same speed it should be played back as.
+		// This isn't required since the video is timestamped, but we will such much higher loss if we send all at once.
+		//
+		// It is important to use a time.Ticker instead of time.Sleep because
+		// * avoids accumulating skew, just calling time.Sleep didn't compensate for the time spent parsing the data
+		// * works around latency issues with Sleep (see https://github.com/golang/go/issues/44343)
+		ticker := time.NewTicker(time.Millisecond * time.Duration((float32(header.TimebaseNumerator)/float32(header.TimebaseDenominator))*1000))
+		for ; true; <-ticker.C {
+			frame, _, ivfErr := ivf.ParseNextFrame()
+			if errors.Is(ivfErr, io.EOF) {
+				fmt.Printf("All video frames parsed and sent")
+			}
+
+			if ivfErr != nil {
+				panic(ivfErr)
+			}
+
+			vid.mu.Lock()
+			for _, lis := range vid.listeners {
+				lis <- frame
+			}
+			vid.mu.Unlock()
+		}
+	}()
+
+	return vid, nil
+}
+
+func (v *video) Join() (<-chan []byte, string, func()) {
+	v.mu.Lock()
+	defer v.mu.Unlock()
+
+	myID := uuid.New().String()
+	ch := make(chan []byte)
+	v.listeners[myID] = ch
+
+	return ch, v.codec, func() {
+		v.mu.Lock()
+		defer v.mu.Unlock()
+
+		delete(v.listeners, myID)
+	}
+}
+
+func handleSession(ctx context.Context, client servicepb.SignalerServiceClient, token string, session *connect.Response[pb.Session], vid *video) {
+	var err error
+	log.Printf("New session")
+
 	peerConnection, err := webrtc.NewPeerConnection(webrtc.Configuration{
 		ICEServers: []webrtc.ICEServer{
 			{
@@ -69,25 +184,27 @@ func main() { //nolint
 			},
 		},
 	})
-	if err != nil {
+
-		panic(err)
+	// We use the cancel func to signal that the stream is ready
-	}
+	iceConnectedCtx, iceConnectedCtxCancel := context.WithCancel(context.Background())
 	defer func() {
-		if cErr := peerConnection.Close(); cErr != nil {
+		if err := peerConnection.Close(); err != nil {
-			fmt.Printf("cannot close peerConnection: %v\n", cErr)
+			fmt.Printf("cannot close peerConnection: %v\n", err)
 		}
 	}()
 
-	if haveVideoFile {
+	// connect to the video stream; the cleanup is done in the goroutine which
+	// consumes the framess
+	ch, trackCodec, cleanUp := vid.Join()
 	// Create a video track
-		videoTrack, videoTrackErr := webrtc.NewTrackLocalStaticSample(webrtc.RTPCodecCapability{MimeType: webrtc.MimeTypeH264}, "video", "pion")
+	videoTrack, videoTrackErr := webrtc.NewTrackLocalStaticSample(webrtc.RTPCodecCapability{MimeType: trackCodec}, "video", "pion")
 	if videoTrackErr != nil {
-			panic(videoTrackErr)
+		log.Printf("Failed to create video track: %v", err)
 	}
 
-		rtpSender, videoTrackErr := peerConnection.AddTrack(videoTrack)
+	rtpSender, err := peerConnection.AddTrack(videoTrack)
-		if videoTrackErr != nil {
+	if err != nil {
-			panic(videoTrackErr)
+		log.Printf("Failed to add track to connection: %v", err)
 	}
 
 	// Read incoming RTCP packets
@@ -96,50 +213,30 @@ func main() { //nolint
 	go func() {
 		rtcpBuf := make([]byte, 1500)
 		for {
-				if _, _, rtcpErr := rtpSender.Read(rtcpBuf); rtcpErr != nil {
+			if _, _, err := rtpSender.Read(rtcpBuf); err != nil {
 				return
 			}
 		}
 	}()
 
 	go func() {
-			// Open a H264 file and start reading using our IVFReader
+		defer cleanUp()
-			file, h264Err := os.Open(videoFileName)
+		readyToSend := false
-			if h264Err != nil {
+		for frame := range ch {
-				panic(h264Err)
+			select {
+			case <-iceConnectedCtx.Done():
+				readyToSend = true
+			default:
+				// do nothing
 			}
-
+			if !readyToSend {
-			h264, h264Err := h264reader.NewReader(file)
+				continue
-			if h264Err != nil {
-				panic(h264Err)
 			}
-
+			if err := videoTrack.WriteSample(media.Sample{Data: frame, Duration: time.Second}); err != nil {
-			// Wait for connection established
+				panic(err)
-			<-iceConnectedCtx.Done()
-
-			// Send our video file frame at a time. Pace our sending so we send it at the same speed it should be played back as.
-			// This isn't required since the video is timestamped, but we will such much higher loss if we send all at once.
-			//
-			// It is important to use a time.Ticker instead of time.Sleep because
-			// * avoids accumulating skew, just calling time.Sleep didn't compensate for the time spent parsing the data
-			// * works around latency issues with Sleep (see https://github.com/golang/go/issues/44343)
-			ticker := time.NewTicker(h264FrameDuration)
-			for ; true; <-ticker.C {
-				nal, h264Err := h264.NextNAL()
-				if h264Err == io.EOF {
-					fmt.Printf("All video frames parsed and sent")
-					os.Exit(0)
-				}
-				if h264Err != nil {
-					panic(h264Err)
-				}
-
-				if h264Err = videoTrack.WriteSample(media.Sample{Data: nal.Data, Duration: h264FrameDuration}); h264Err != nil {
-					panic(h264Err)
 			}
 		}
 	}()
-	}
 
 	// Set the handler for ICE connection state
 	// This will notify you when the peer has connected/disconnected
@@ -160,15 +257,27 @@ func main() { //nolint
 			// Use webrtc.PeerConnectionStateDisconnected if you are interested in detecting faster timeout.
 			// Note that the PeerConnection may come back from PeerConnectionStateDisconnected.
 			fmt.Println("Peer Connection has gone to failed exiting")
-			os.Exit(0)
+			return
 		}
 	})
 
 	peerConnection.OnICECandidate(func(i *webrtc.ICECandidate) {
 		if i == nil {
+			if _, err := client.CreateIceMessage(ctx, withAuth(token, &pb.CreateIceMessageRequest{
+				SessionIdentifier: session.Msg.GetId(),
+				IceMessage: &pb.IceMessage{
+					Type: &pb.IceMessage_NoMoreCandidates{},
+				},
+			})); err != nil {
+				log.Fatalf("Error sending done w/ candidates: %v", err)
+			}
 			return
 		}
 		c := i.ToJSON()
+		var usernameFragment *string
+		if c.UsernameFragment != nil {
+			usernameFragment = proto.String(*c.UsernameFragment)
+		}
 		client.CreateIceMessage(ctx, withAuth(token, &pb.CreateIceMessageRequest{
 			SessionIdentifier: session.Msg.GetId(),
 			IceMessage: &pb.IceMessage{
@@ -177,22 +286,25 @@ func main() { //nolint
 						Candidate:        c.Candidate,
 						SdpMid:           c.SDPMid,
 						SdpLineIndex:     proto.Int32(int32(*c.SDPMLineIndex)),
-						UsernameFragment: proto.String(*c.UsernameFragment),
+						UsernameFragment: usernameFragment,
 					},
 				},
 			},
 		}))
 	})
+	log.Printf("Spawning helper")
+
+	// helper which sends answers, waits for
 
 	// Add ICE candidates from remote
-	go func() {
 	for {
 		msg, err := client.PopIceMessage(ctx, withAuth(token, &pb.PopIceMessageRequest{
 			SessionIdentifier: session.Msg.GetId(),
 		}))
 		if err != nil {
-				log.Fatalf("failed to pop ice message: %v", err)
+			log.Printf("failed to pop ice message: %v", err)
 		}
+		//log.Printf("Got ice message: %v", prototext.Format(msg.Msg))
 		switch msg.Msg.Type.(type) {
 		case *pb.IceMessage_Candidate:
 			candidate := msg.Msg.GetCandidate()
@@ -208,27 +320,20 @@ func main() { //nolint
 			}); err != nil {
 				log.Fatalf("Failed to add ice candidate: %v", err)
 			}
-			case *pb.IceMessage_Session:
-				session := msg.Msg.GetSession()
-
-				offer := webrtc.SessionDescription{
-					Type: webrtc.SDPType(session.SdpType),
-					SDP:  session.Sdp,
-				}
-				if err := peerConnection.SetLocalDescription(offer); err != nil {
-					log.Fatalf("Failed to set location description: %v", err)
-				}
 
 			// Send back an answer
 			answer, err := peerConnection.CreateAnswer(nil)
 			if err != nil {
-					log.Fatalf("Failed to create an answer: %v", err)
+				log.Printf("Candidate failed")
+				continue
 			}
-				if err := peerConnection.SetRemoteDescription(answer); err != nil {
+
-					log.Fatalf("Failed to set remote description: %v", err)
+			if err := peerConnection.SetLocalDescription(answer); err != nil {
+				log.Printf("Failed to set local description: %v", err)
 			}
 
 			_, err = client.CreateIceMessage(ctx, withAuth(token, &pb.CreateIceMessageRequest{
+				SessionIdentifier: session.Msg.GetId(),
 				IceMessage: &pb.IceMessage{
 					Type: &pb.IceMessage_Session{
 						Session: &pb.IceSessionDescription{
@@ -239,12 +344,27 @@ func main() { //nolint
 				},
 			}))
 			if err != nil {
-					log.Fatalf("Failed to send answer: %v", err)
+				log.Printf("Failed to send answer: %v", err)
 			}
-			}
+		case *pb.IceMessage_Session:
-		}
+			iceSession := msg.Msg.GetSession()
-	}()
 
-	// Block forever
+			switch iceSession.SdpType {
-	select {}
+			case int64(webrtc.SDPTypeOffer):
+				offer := webrtc.SessionDescription{
+					Type: webrtc.SDPType(iceSession.SdpType),
+					SDP:  iceSession.Sdp,
+				}
+
+				if err := peerConnection.SetRemoteDescription(offer); err != nil {
+					log.Fatalf("Failed to set remote description: %v", err)
+				}
+			default:
+				log.Printf("unexpected sdp type: %v", webrtc.SDPType(iceSession.SdpType).String())
+			}
+			log.Printf("Accepted promise!")
+		case *pb.IceMessage_NoMoreCandidates:
+			// do nothing
+		}
+	}
 }

gen/signaler_service.pb.go

@@ -601,6 +601,7 @@ type IceMessage struct {
 	//
 	//	*IceMessage_Candidate
 	//	*IceMessage_Session
+	//	*IceMessage_NoMoreCandidates
 	Type isIceMessage_Type `protobuf_oneof:"type"`
 }
 
@@ -657,6 +658,13 @@ func (x *IceMessage) GetSession() *IceSessionDescription {
 	return nil
 }
 
+func (x *IceMessage) GetNoMoreCandidates() *NoMoreCandidates {
+	if x, ok := x.GetType().(*IceMessage_NoMoreCandidates); ok {
+		return x.NoMoreCandidates
+	}
+	return nil
+}
+
 type isIceMessage_Type interface {
 	isIceMessage_Type()
 }
@@ -669,10 +677,54 @@ type IceMessage_Session struct {
 	Session *IceSessionDescription `protobuf:"bytes,2,opt,name=session,proto3,oneof"`
 }
 
+type IceMessage_NoMoreCandidates struct {
+	NoMoreCandidates *NoMoreCandidates `protobuf:"bytes,3,opt,name=no_more_candidates,json=noMoreCandidates,proto3,oneof"`
+}
+
 func (*IceMessage_Candidate) isIceMessage_Type() {}
 
 func (*IceMessage_Session) isIceMessage_Type() {}
 
+func (*IceMessage_NoMoreCandidates) isIceMessage_Type() {}
+
+type NoMoreCandidates struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *NoMoreCandidates) Reset() {
+	*x = NoMoreCandidates{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_signaler_service_proto_msgTypes[12]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *NoMoreCandidates) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*NoMoreCandidates) ProtoMessage() {}
+
+func (x *NoMoreCandidates) ProtoReflect() protoreflect.Message {
+	mi := &file_signaler_service_proto_msgTypes[12]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use NoMoreCandidates.ProtoReflect.Descriptor instead.
+func (*NoMoreCandidates) Descriptor() ([]byte, []int) {
+	return file_signaler_service_proto_rawDescGZIP(), []int{12}
+}
+
 type IceCandidate struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -688,7 +740,7 @@ type IceCandidate struct {
 func (x *IceCandidate) Reset() {
 	*x = IceCandidate{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_signaler_service_proto_msgTypes[12]
+		mi := &file_signaler_service_proto_msgTypes[13]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -701,7 +753,7 @@ func (x *IceCandidate) String() string {
 func (*IceCandidate) ProtoMessage() {}
 
 func (x *IceCandidate) ProtoReflect() protoreflect.Message {
-	mi := &file_signaler_service_proto_msgTypes[12]
+	mi := &file_signaler_service_proto_msgTypes[13]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -714,7 +766,7 @@ func (x *IceCandidate) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use IceCandidate.ProtoReflect.Descriptor instead.
 func (*IceCandidate) Descriptor() ([]byte, []int) {
-	return file_signaler_service_proto_rawDescGZIP(), []int{12}
+	return file_signaler_service_proto_rawDescGZIP(), []int{13}
 }
 
 func (x *IceCandidate) GetCandidate() string {
@@ -758,7 +810,7 @@ type IceSessionDescription struct {
 func (x *IceSessionDescription) Reset() {
 	*x = IceSessionDescription{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_signaler_service_proto_msgTypes[13]
+		mi := &file_signaler_service_proto_msgTypes[14]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -771,7 +823,7 @@ func (x *IceSessionDescription) String() string {
 func (*IceSessionDescription) ProtoMessage() {}
 
 func (x *IceSessionDescription) ProtoReflect() protoreflect.Message {
-	mi := &file_signaler_service_proto_msgTypes[13]
+	mi := &file_signaler_service_proto_msgTypes[14]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -784,7 +836,7 @@ func (x *IceSessionDescription) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use IceSessionDescription.ProtoReflect.Descriptor instead.
 func (*IceSessionDescription) Descriptor() ([]byte, []int) {
-	return file_signaler_service_proto_rawDescGZIP(), []int{13}
+	return file_signaler_service_proto_rawDescGZIP(), []int{14}
 }
 
 func (x *IceSessionDescription) GetSdpType() int64 {
@@ -813,7 +865,7 @@ type Session struct {
 func (x *Session) Reset() {
 	*x = Session{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_signaler_service_proto_msgTypes[14]
+		mi := &file_signaler_service_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -826,7 +878,7 @@ func (x *Session) String() string {
 func (*Session) ProtoMessage() {}
 
 func (x *Session) ProtoReflect() protoreflect.Message {
-	mi := &file_signaler_service_proto_msgTypes[14]
+	mi := &file_signaler_service_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -839,7 +891,7 @@ func (x *Session) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Session.ProtoReflect.Descriptor instead.
 func (*Session) Descriptor() ([]byte, []int) {
-	return file_signaler_service_proto_rawDescGZIP(), []int{14}
+	return file_signaler_service_proto_rawDescGZIP(), []int{15}
 }
 
 func (x *Session) GetId() *Session_Identifier {
@@ -867,7 +919,7 @@ type AuthToken struct {
 func (x *AuthToken) Reset() {
 	*x = AuthToken{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_signaler_service_proto_msgTypes[15]
+		mi := &file_signaler_service_proto_msgTypes[16]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -880,7 +932,7 @@ func (x *AuthToken) String() string {
 func (*AuthToken) ProtoMessage() {}
 
 func (x *AuthToken) ProtoReflect() protoreflect.Message {
-	mi := &file_signaler_service_proto_msgTypes[15]
+	mi := &file_signaler_service_proto_msgTypes[16]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -893,7 +945,7 @@ func (x *AuthToken) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use AuthToken.ProtoReflect.Descriptor instead.
 func (*AuthToken) Descriptor() ([]byte, []int) {
-	return file_signaler_service_proto_rawDescGZIP(), []int{15}
+	return file_signaler_service_proto_rawDescGZIP(), []int{16}
 }
 
 func (x *AuthToken) GetToken() string {
@@ -916,7 +968,7 @@ type CreateAuthTokenRequest_Camera struct {
 func (x *CreateAuthTokenRequest_Camera) Reset() {
 	*x = CreateAuthTokenRequest_Camera{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_signaler_service_proto_msgTypes[16]
+		mi := &file_signaler_service_proto_msgTypes[17]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -929,7 +981,7 @@ func (x *CreateAuthTokenRequest_Camera) String() string {
 func (*CreateAuthTokenRequest_Camera) ProtoMessage() {}
 
 func (x *CreateAuthTokenRequest_Camera) ProtoReflect() protoreflect.Message {
-	mi := &file_signaler_service_proto_msgTypes[16]
+	mi := &file_signaler_service_proto_msgTypes[17]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -961,7 +1013,7 @@ type CreateAuthTokenRequest_Client struct {
 func (x *CreateAuthTokenRequest_Client) Reset() {
 	*x = CreateAuthTokenRequest_Client{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_signaler_service_proto_msgTypes[17]
+		mi := &file_signaler_service_proto_msgTypes[18]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -974,7 +1026,7 @@ func (x *CreateAuthTokenRequest_Client) String() string {
 func (*CreateAuthTokenRequest_Client) ProtoMessage() {}
 
 func (x *CreateAuthTokenRequest_Client) ProtoReflect() protoreflect.Message {
-	mi := &file_signaler_service_proto_msgTypes[17]
+	mi := &file_signaler_service_proto_msgTypes[18]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1001,7 +1053,7 @@ type Camera_Identifier struct {
 func (x *Camera_Identifier) Reset() {
 	*x = Camera_Identifier{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_signaler_service_proto_msgTypes[18]
+		mi := &file_signaler_service_proto_msgTypes[19]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1014,7 +1066,7 @@ func (x *Camera_Identifier) String() string {
 func (*Camera_Identifier) ProtoMessage() {}
 
 func (x *Camera_Identifier) ProtoReflect() protoreflect.Message {
-	mi := &file_signaler_service_proto_msgTypes[18]
+	mi := &file_signaler_service_proto_msgTypes[19]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1048,7 +1100,7 @@ type Session_Identifier struct {
 func (x *Session_Identifier) Reset() {
 	*x = Session_Identifier{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_signaler_service_proto_msgTypes[19]
+		mi := &file_signaler_service_proto_msgTypes[20]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1061,7 +1113,7 @@ func (x *Session_Identifier) String() string {
 func (*Session_Identifier) ProtoMessage() {}
 
 func (x *Session_Identifier) ProtoReflect() protoreflect.Message {
-	mi := &file_signaler_service_proto_msgTypes[19]
+	mi := &file_signaler_service_proto_msgTypes[20]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1074,7 +1126,7 @@ func (x *Session_Identifier) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Session_Identifier.ProtoReflect.Descriptor instead.
 func (*Session_Identifier) Descriptor() ([]byte, []int) {
-	return file_signaler_service_proto_rawDescGZIP(), []int{14, 0}
+	return file_signaler_service_proto_rawDescGZIP(), []int{15, 0}
 }
 
 func (x *Session_Identifier) GetId() string {
@@ -1155,7 +1207,7 @@ var file_signaler_service_proto_rawDesc = []byte{
 	0x74, 0x69, 0x66, 0x69, 0x65, 0x72, 0x52, 0x0a, 0x69, 0x64, 0x65, 0x6e, 0x74, 0x69, 0x66, 0x69,
 	0x65, 0x72, 0x1a, 0x1c, 0x0a, 0x0a, 0x49, 0x64, 0x65, 0x6e, 0x74, 0x69, 0x66, 0x69, 0x65, 0x72,
 	0x12, 0x0e, 0x0a, 0x02, 0x69, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x02, 0x69, 0x64,
-	0x22, 0x89, 0x01, 0x0a, 0x0a, 0x49, 0x63, 0x65, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x12,
+	0x22, 0xd5, 0x01, 0x0a, 0x0a, 0x49, 0x63, 0x65, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x12,
 	0x36, 0x0a, 0x09, 0x63, 0x61, 0x6e, 0x64, 0x69, 0x64, 0x61, 0x74, 0x65, 0x18, 0x01, 0x20, 0x01,
 	0x28, 0x0b, 0x32, 0x16, 0x2e, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x65, 0x72, 0x2e, 0x49, 0x63,
 	0x65, 0x43, 0x61, 0x6e, 0x64, 0x69, 0x64, 0x61, 0x74, 0x65, 0x48, 0x00, 0x52, 0x09, 0x63, 0x61,
@@ -1163,7 +1215,13 @@ var file_signaler_service_proto_rawDesc = []byte{
 	0x6f, 0x6e, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1f, 0x2e, 0x73, 0x69, 0x67, 0x6e, 0x61,
 	0x6c, 0x65, 0x72, 0x2e, 0x49, 0x63, 0x65, 0x53, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x44, 0x65,
 	0x73, 0x63, 0x72, 0x69, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x48, 0x00, 0x52, 0x07, 0x73, 0x65, 0x73,
-	0x73, 0x69, 0x6f, 0x6e, 0x42, 0x06, 0x0a, 0x04, 0x74, 0x79, 0x70, 0x65, 0x22, 0xdc, 0x01, 0x0a,
+	0x73, 0x69, 0x6f, 0x6e, 0x12, 0x4a, 0x0a, 0x12, 0x6e, 0x6f, 0x5f, 0x6d, 0x6f, 0x72, 0x65, 0x5f,
+	0x63, 0x61, 0x6e, 0x64, 0x69, 0x64, 0x61, 0x74, 0x65, 0x73, 0x18, 0x03, 0x20, 0x01, 0x28, 0x0b,
+	0x32, 0x1a, 0x2e, 0x73, 0x69, 0x67, 0x6e, 0x61, 0x6c, 0x65, 0x72, 0x2e, 0x4e, 0x6f, 0x4d, 0x6f,
+	0x72, 0x65, 0x43, 0x61, 0x6e, 0x64, 0x69, 0x64, 0x61, 0x74, 0x65, 0x73, 0x48, 0x00, 0x52, 0x10,
+	0x6e, 0x6f, 0x4d, 0x6f, 0x72, 0x65, 0x43, 0x61, 0x6e, 0x64, 0x69, 0x64, 0x61, 0x74, 0x65, 0x73,
+	0x42, 0x06, 0x0a, 0x04, 0x74, 0x79, 0x70, 0x65, 0x22, 0x12, 0x0a, 0x10, 0x4e, 0x6f, 0x4d, 0x6f,
+	0x72, 0x65, 0x43, 0x61, 0x6e, 0x64, 0x69, 0x64, 0x61, 0x74, 0x65, 0x73, 0x22, 0xdc, 0x01, 0x0a,
 	0x0c, 0x49, 0x63, 0x65, 0x43, 0x61, 0x6e, 0x64, 0x69, 0x64, 0x61, 0x74, 0x65, 0x12, 0x1c, 0x0a,
 	0x09, 0x63, 0x61, 0x6e, 0x64, 0x69, 0x64, 0x61, 0x74, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09,
 	0x52, 0x09, 0x63, 0x61, 0x6e, 0x64, 0x69, 0x64, 0x61, 0x74, 0x65, 0x12, 0x1c, 0x0a, 0x07, 0x73,
@@ -1245,7 +1303,7 @@ func file_signaler_service_proto_rawDescGZIP() []byte {
 	return file_signaler_service_proto_rawDescData
 }
 
-var file_signaler_service_proto_msgTypes = make([]protoimpl.MessageInfo, 20)
+var file_signaler_service_proto_msgTypes = make([]protoimpl.MessageInfo, 21)
 var file_signaler_service_proto_goTypes = []interface{}{
 	(*CreateAuthTokenRequest)(nil),        // 0: signaler.CreateAuthTokenRequest
 	(*ListCamerasRequest)(nil),            // 1: signaler.ListCamerasRequest
@@ -1259,48 +1317,50 @@ var file_signaler_service_proto_goTypes = []interface{}{
 	(*PopIceMessageRequest)(nil),          // 9: signaler.PopIceMessageRequest
 	(*Camera)(nil),                        // 10: signaler.Camera
 	(*IceMessage)(nil),                    // 11: signaler.IceMessage
-	(*IceCandidate)(nil),                  // 12: signaler.IceCandidate
+	(*NoMoreCandidates)(nil),              // 12: signaler.NoMoreCandidates
-	(*IceSessionDescription)(nil),         // 13: signaler.IceSessionDescription
+	(*IceCandidate)(nil),                  // 13: signaler.IceCandidate
-	(*Session)(nil),                       // 14: signaler.Session
+	(*IceSessionDescription)(nil),         // 14: signaler.IceSessionDescription
-	(*AuthToken)(nil),                     // 15: signaler.AuthToken
+	(*Session)(nil),                       // 15: signaler.Session
-	(*CreateAuthTokenRequest_Camera)(nil), // 16: signaler.CreateAuthTokenRequest.Camera
+	(*AuthToken)(nil),                     // 16: signaler.AuthToken
-	(*CreateAuthTokenRequest_Client)(nil), // 17: signaler.CreateAuthTokenRequest.Client
+	(*CreateAuthTokenRequest_Camera)(nil), // 17: signaler.CreateAuthTokenRequest.Camera
-	(*Camera_Identifier)(nil),             // 18: signaler.Camera.Identifier
+	(*CreateAuthTokenRequest_Client)(nil), // 18: signaler.CreateAuthTokenRequest.Client
-	(*Session_Identifier)(nil),            // 19: signaler.Session.Identifier
+	(*Camera_Identifier)(nil),             // 19: signaler.Camera.Identifier
+	(*Session_Identifier)(nil),            // 20: signaler.Session.Identifier
 }
 var file_signaler_service_proto_depIdxs = []int32{
-	16, // 0: signaler.CreateAuthTokenRequest.camera:type_name -> signaler.CreateAuthTokenRequest.Camera
+	17, // 0: signaler.CreateAuthTokenRequest.camera:type_name -> signaler.CreateAuthTokenRequest.Camera
-	17, // 1: signaler.CreateAuthTokenRequest.client:type_name -> signaler.CreateAuthTokenRequest.Client
+	18, // 1: signaler.CreateAuthTokenRequest.client:type_name -> signaler.CreateAuthTokenRequest.Client
 	10, // 2: signaler.ListCamerasResponse.cameras:type_name -> signaler.Camera
-	14, // 3: signaler.CreateSessionRequest.session:type_name -> signaler.Session
+	15, // 3: signaler.CreateSessionRequest.session:type_name -> signaler.Session
-	14, // 4: signaler.PopSessionRequest.session:type_name -> signaler.Session
+	15, // 4: signaler.PopSessionRequest.session:type_name -> signaler.Session
-	14, // 5: signaler.UpdateSessionRequest.session:type_name -> signaler.Session
+	15, // 5: signaler.UpdateSessionRequest.session:type_name -> signaler.Session
-	14, // 6: signaler.ListSessionsResponse.sessions:type_name -> signaler.Session
+	15, // 6: signaler.ListSessionsResponse.sessions:type_name -> signaler.Session
-	19, // 7: signaler.CreateIceMessageRequest.session_identifier:type_name -> signaler.Session.Identifier
+	20, // 7: signaler.CreateIceMessageRequest.session_identifier:type_name -> signaler.Session.Identifier
 	11, // 8: signaler.CreateIceMessageRequest.ice_message:type_name -> signaler.IceMessage
-	19, // 9: signaler.PopIceMessageRequest.session_identifier:type_name -> signaler.Session.Identifier
+	20, // 9: signaler.PopIceMessageRequest.session_identifier:type_name -> signaler.Session.Identifier
-	18, // 10: signaler.Camera.identifier:type_name -> signaler.Camera.Identifier
+	19, // 10: signaler.Camera.identifier:type_name -> signaler.Camera.Identifier
-	12, // 11: signaler.IceMessage.candidate:type_name -> signaler.IceCandidate
+	13, // 11: signaler.IceMessage.candidate:type_name -> signaler.IceCandidate
-	13, // 12: signaler.IceMessage.session:type_name -> signaler.IceSessionDescription
+	14, // 12: signaler.IceMessage.session:type_name -> signaler.IceSessionDescription
-	19, // 13: signaler.Session.id:type_name -> signaler.Session.Identifier
+	12, // 13: signaler.IceMessage.no_more_candidates:type_name -> signaler.NoMoreCandidates
-	18, // 14: signaler.Session.camera:type_name -> signaler.Camera.Identifier
+	20, // 14: signaler.Session.id:type_name -> signaler.Session.Identifier
-	0,  // 15: signaler.SignalerService.CreateAuthToken:input_type -> signaler.CreateAuthTokenRequest
+	19, // 15: signaler.Session.camera:type_name -> signaler.Camera.Identifier
-	1,  // 16: signaler.SignalerService.ListCameras:input_type -> signaler.ListCamerasRequest
+	0,  // 16: signaler.SignalerService.CreateAuthToken:input_type -> signaler.CreateAuthTokenRequest
-	3,  // 17: signaler.SignalerService.CreateSession:input_type -> signaler.CreateSessionRequest
+	1,  // 17: signaler.SignalerService.ListCameras:input_type -> signaler.ListCamerasRequest
-	4,  // 18: signaler.SignalerService.PopSession:input_type -> signaler.PopSessionRequest
+	3,  // 18: signaler.SignalerService.CreateSession:input_type -> signaler.CreateSessionRequest
-	8,  // 19: signaler.SignalerService.CreateIceMessage:input_type -> signaler.CreateIceMessageRequest
+	4,  // 19: signaler.SignalerService.PopSession:input_type -> signaler.PopSessionRequest
-	9,  // 20: signaler.SignalerService.PopIceMessage:input_type -> signaler.PopIceMessageRequest
+	8,  // 20: signaler.SignalerService.CreateIceMessage:input_type -> signaler.CreateIceMessageRequest
-	15, // 21: signaler.SignalerService.CreateAuthToken:output_type -> signaler.AuthToken
+	9,  // 21: signaler.SignalerService.PopIceMessage:input_type -> signaler.PopIceMessageRequest
-	2,  // 22: signaler.SignalerService.ListCameras:output_type -> signaler.ListCamerasResponse
+	16, // 22: signaler.SignalerService.CreateAuthToken:output_type -> signaler.AuthToken
-	14, // 23: signaler.SignalerService.CreateSession:output_type -> signaler.Session
+	2,  // 23: signaler.SignalerService.ListCameras:output_type -> signaler.ListCamerasResponse
-	14, // 24: signaler.SignalerService.PopSession:output_type -> signaler.Session
+	15, // 24: signaler.SignalerService.CreateSession:output_type -> signaler.Session
-	11, // 25: signaler.SignalerService.CreateIceMessage:output_type -> signaler.IceMessage
+	15, // 25: signaler.SignalerService.PopSession:output_type -> signaler.Session
-	11, // 26: signaler.SignalerService.PopIceMessage:output_type -> signaler.IceMessage
+	11, // 26: signaler.SignalerService.CreateIceMessage:output_type -> signaler.IceMessage
-	21, // [21:27] is the sub-list for method output_type
+	11, // 27: signaler.SignalerService.PopIceMessage:output_type -> signaler.IceMessage
-	15, // [15:21] is the sub-list for method input_type
+	22, // [22:28] is the sub-list for method output_type
-	15, // [15:15] is the sub-list for extension type_name
+	16, // [16:22] is the sub-list for method input_type
-	15, // [15:15] is the sub-list for extension extendee
+	16, // [16:16] is the sub-list for extension type_name
-	0,  // [0:15] is the sub-list for field type_name
+	16, // [16:16] is the sub-list for extension extendee
+	0,  // [0:16] is the sub-list for field type_name
 }
 
 func init() { file_signaler_service_proto_init() }
@@ -1454,7 +1514,7 @@ func file_signaler_service_proto_init() {
 			}
 		}
 		file_signaler_service_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*IceCandidate); i {
+			switch v := v.(*NoMoreCandidates); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1466,7 +1526,7 @@ func file_signaler_service_proto_init() {
 			}
 		}
 		file_signaler_service_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*IceSessionDescription); i {
+			switch v := v.(*IceCandidate); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1478,7 +1538,7 @@ func file_signaler_service_proto_init() {
 			}
 		}
 		file_signaler_service_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Session); i {
+			switch v := v.(*IceSessionDescription); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1490,7 +1550,7 @@ func file_signaler_service_proto_init() {
 			}
 		}
 		file_signaler_service_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*AuthToken); i {
+			switch v := v.(*Session); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1502,7 +1562,7 @@ func file_signaler_service_proto_init() {
 			}
 		}
 		file_signaler_service_proto_msgTypes[16].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CreateAuthTokenRequest_Camera); i {
+			switch v := v.(*AuthToken); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1514,7 +1574,7 @@ func file_signaler_service_proto_init() {
 			}
 		}
 		file_signaler_service_proto_msgTypes[17].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CreateAuthTokenRequest_Client); i {
+			switch v := v.(*CreateAuthTokenRequest_Camera); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1526,7 +1586,7 @@ func file_signaler_service_proto_init() {
 			}
 		}
 		file_signaler_service_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Camera_Identifier); i {
+			switch v := v.(*CreateAuthTokenRequest_Client); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1538,6 +1598,18 @@ func file_signaler_service_proto_init() {
 			}
 		}
 		file_signaler_service_proto_msgTypes[19].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Camera_Identifier); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_signaler_service_proto_msgTypes[20].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Session_Identifier); i {
 			case 0:
 				return &v.state
@@ -1557,15 +1629,16 @@ func file_signaler_service_proto_init() {
 	file_signaler_service_proto_msgTypes[11].OneofWrappers = []interface{}{
 		(*IceMessage_Candidate)(nil),
 		(*IceMessage_Session)(nil),
+		(*IceMessage_NoMoreCandidates)(nil),
 	}
-	file_signaler_service_proto_msgTypes[12].OneofWrappers = []interface{}{}
+	file_signaler_service_proto_msgTypes[13].OneofWrappers = []interface{}{}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_signaler_service_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   20,
+			NumMessages:   21,
 			NumExtensions: 0,
 			NumServices:   1,
 		},

go.mod

@@ -6,8 +6,9 @@ require (
 	connectrpc.com/connect v1.11.1
 	connectrpc.com/grpcreflect v1.2.0
 	github.com/gofrs/uuid/v5 v5.0.0
-	github.com/pion/example-webrtc-applications/v3 v3.0.5
 	github.com/pion/webrtc/v3 v3.2.20
+	github.com/rs/cors v1.10.0
+	golang.org/x/net v0.14.0
 	google.golang.org/grpc v1.58.1
 	google.golang.org/protobuf v1.31.0
 )
@@ -34,8 +35,8 @@ require (
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/stretchr/testify v1.8.4 // indirect
 	golang.org/x/crypto v0.12.0 // indirect
-	golang.org/x/net v0.14.0 // indirect
 	golang.org/x/sys v0.11.0 // indirect
+	golang.org/x/text v0.12.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20230711160842-782d3b101e98 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -2,7 +2,6 @@ connectrpc.com/connect v1.11.1 h1:dqRwblixqkVh+OFBOOL1yIf1jS/yP0MSJLijRj29bFg=
 connectrpc.com/connect v1.11.1/go.mod h1:3AGaO6RRGMx5IKFfqbe3hvK1NqLosFNP2BxDYTPmNPo=
 connectrpc.com/grpcreflect v1.2.0 h1:Q6og1S7HinmtbEuBvARLNwYmTbhEGRpHDhqrPNlmK+U=
 connectrpc.com/grpcreflect v1.2.0/go.mod h1:nwSOKmE8nU5u/CidgHtPYk1PFI3U9ignz7iDMxOYkSY=
-github.com/at-wat/ebml-go v0.16.0/go.mod h1:w1cJs7zmGsb5nnSvhWGKLCxvfu4FVx5ERvYDIalj1ww=
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@@ -18,7 +17,6 @@ github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrU
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@@ -29,102 +27,69 @@ github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
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@@ -133,19 +98,15 @@ github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcU
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 golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
@@ -153,16 +114,9 @@ golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73r
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200520004742-59133d7f0dd7/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
-golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
-golang.org/x/net v0.0.0-20201201195509-5d6afe98e0b7/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
-golang.org/x/net v0.0.0-20201202161906-c7110b5ffcbb/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
-golang.org/x/net v0.0.0-20210119194325-5f4716e94777/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
-golang.org/x/net v0.0.0-20210331212208-0fccb6fa2b5c/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.0.0-20210428140749-89ef3d95e781/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
-golang.org/x/net v0.0.0-20210726213435-c6fcb2dbf985/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.0.0-20210805182204-aaa1db679c0d/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/net v0.1.0/go.mod h1:Cx3nUiGt4eDBEyega/BKRp+/AlGL8hYe7U9odMt2Cco=
 golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
@@ -187,10 +141,8 @@ golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210112080510-489259a85091/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

pkg/signaler/signaler.go

@@ -5,6 +5,7 @@ import (
 	"context"
 	"encoding/base64"
 	"fmt"
+	"log"
 	"strings"
 	"sync"
 	"time"
@@ -51,22 +52,25 @@ func New() *Server {
 func (s *Server) CreateAuthToken(ctx context.Context, request *connect.Request[pb.CreateAuthTokenRequest]) (*connect.Response[pb.AuthToken], error) {
 	req := request.Msg
 
+	log.Printf("Creating auth token")
+	defer log.Printf("Done creating auth token")
 	var id string
 	switch req.Type.(type) {
 	case *pb.CreateAuthTokenRequest_Camera_:
 		id = req.GetCamera().GetId()
-		s.mu.Lock()
 		thisCamera := &camera{
 			id: id,
 		}
 		home := req.GetHome()
+		s.mu.Lock()
 		if _, ok := s.camerasByHome[home]; !ok {
 			s.camerasByHome[home] = make(map[string]*camera)
 		}
 		s.camerasByHome[home][id] = thisCamera
-		if _, ok := s.sessionsByCamera[id]; !ok {
+		if _, ok := s.sessionsByCamera[id]; ok {
-			s.sessionsByCamera[id] = make(chan *session, 100)
+			close(s.sessionsByCamera[id])
 		}
+		s.sessionsByCamera[id] = make(chan *session, 100)
 		s.mu.Unlock()
 	case *pb.CreateAuthTokenRequest_Client_:
 		myUUID, err := uuid.NewV4()
@@ -113,6 +117,9 @@ func (s *Server) ListCameras(ctx context.Context, request *connect.Request[pb.Li
 // Optionally, wait_for_update can be set to prevent returning until the Camera has seen the
 // session request, populated candidates, and returned a session offer.
 func (s *Server) CreateSession(ctx context.Context, request *connect.Request[pb.CreateSessionRequest]) (*connect.Response[pb.Session], error) {
+
+	log.Printf("Creating session")
+	defer log.Printf("Done session")
 	thisSession := request.Msg.Session
 	if thisSession == nil {
 		return nil, status.Errorf(codes.InvalidArgument, "nil session")
@@ -125,8 +132,6 @@ func (s *Server) CreateSession(ctx context.Context, request *connect.Request[pb.
 	id := myUUID.String()
 	thisSession.Id = &pb.Session_Identifier{Id: id}
 	cameraID := thisSession.GetCamera().GetId()
-	s.mu.Lock()
-	defer s.mu.Unlock()
 
 	sess := &session{
 		id:         id,
@@ -135,8 +140,13 @@ func (s *Server) CreateSession(ctx context.Context, request *connect.Request[pb.
 		toCamera:   make(chan *pb.IceMessage, 100),
 		toClient:   make(chan *pb.IceMessage, 100),
 	}
-	s.sessionsByCamera[cameraID] <- sess
+
+	s.mu.Lock()
+	ch := s.sessionsByCamera[cameraID]
 	s.sessionsById[id] = sess
+	s.mu.Unlock()
+
+	ch <- sess
 
 	return connect.NewResponse(thisSession), nil
 }
@@ -161,6 +171,10 @@ func (s *Server) PopSession(ctx context.Context, request *connect.Request[pb.Pop
 
 	sess := <-ch
 
+	if sess == nil {
+		return nil, status.Errorf(codes.DataLoss, "someone else stole the session")
+	}
+
 	return connect.NewResponse(&pb.Session{
 		Id: &pb.Session_Identifier{
 			Id: sess.id,
@@ -228,8 +242,10 @@ func (s *Server) cleanup() {
 	ticker := time.NewTicker(time.Minute * 5)
 	for t := range ticker.C {
 		func() {
+			log.Printf("Starting cleanup")
 			s.mu.Lock()
 			defer s.mu.Unlock()
+			log.Printf("Cleanup locked")
 
 			// Look for any stale sessions
 			staleSessionsByCamera := make(map[string]*session)
@@ -245,16 +261,9 @@ func (s *Server) cleanup() {
 					}
 				}
 			}
+			log.Printf("Removing stale sessions")
 
-			for camera, lastSession := range staleSessionsByCamera {
+			// TODO: how do we prevent sessions from accumlating if cameras don't pick up on the request?
-				// Consume from the chanel until we remove all stale sessions
-				for sess := range s.sessionsByCamera[camera] {
-					if sess == lastSession {
-						// We consumed all stale channels; break
-						break
-					}
-				}
-			}
 		}()
 	}
 }

proto/signaler_service.proto

@@ -96,9 +96,12 @@ message IceMessage {
     oneof type {
         IceCandidate candidate = 1;
         IceSessionDescription session = 2;
+        NoMoreCandidates no_more_candidates = 3;
     }
 }
 
+message NoMoreCandidates {}
+
 message IceCandidate {
     // Copied from https://pkg.go.dev/github.com/pion/webrtc/v4#ICECandidateInit
     string candidate = 1;

ui/android/app/build.gradle

@@ -45,7 +45,7 @@ android {
         applicationId "com.example.ui"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
-        minSdkVersion flutter.minSdkVersion
+        minSdkVersion 21
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName

ui/android/app/src/main/AndroidManifest.xml

@@ -30,4 +30,6 @@
             android:name="flutterEmbedding"
             android:value="2" />
     </application>
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
 </manifest>

ui/lib/call.dart

@@ -1,22 +1,60 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:flutter_webrtc/flutter_webrtc.dart';
+import 'package:grpc/grpc.dart';
 import 'package:logger/logger.dart';
+import 'package:ui/gen/signaler_service.pb.dart';
+import 'package:ui/gen/signaler_service.pbgrpc.dart' as pb;
+import 'package:fixnum/fixnum.dart';
+import 'package:ui/session_service.dart';
 
 class Call extends StatefulWidget {
-  final String host;
+  final pb.SignalerServiceClient client;
-  const Call({required this.host, super.key});
+  final SessionService sessionService;
+  final pb.Camera_Identifier cameraID;
+  final String home;
+  const Call(this.client, this.sessionService,
+      {required this.cameraID, required this.home, super.key});
 
   @override
-  _CallState createState() => _CallState();
+  CallState createState() => CallState();
 }
 
-class _CallState extends State<Call> {
+class CallState extends State<Call> {
   Logger logger = Logger();
-  RTCVideoRenderer _remoteRenderer = RTCVideoRenderer();
+  final RTCVideoRenderer _remoteRenderer = RTCVideoRenderer();
+  bool _ready = false;
+  String statusLine = "Building...";
 
-  void _connect(BuildContext context) async {}
+  @override
+  initState() {
+    super.initState();
+    _connect();
+  }
 
-  Future<Session> _createSesson() async {
+  _connect() async {
+    _ready = false;
+    logger.i("Init remote renderer");
+    await _remoteRenderer.initialize();
+    logger.i("Creating session");
+    await _createSesson();
+  }
+
+  _createSesson() async {
+    var callOptions = CallOptions(metadata: {
+      'Authorization': await widget.sessionService.getAuthToken(widget.home)
+    });
+
+    var cancelCreate = Completer();
+
+    var clientSession = await widget.client.createSession(
+        pb.CreateSessionRequest(
+          session: pb.Session(
+            camera: widget.cameraID,
+          ),
+        ),
+        options: callOptions);
     RTCPeerConnection peerConnection = await createPeerConnection({
       // Ice servers; just use the Google one for now
       'iceServers': [
@@ -28,47 +66,129 @@ class _CallState extends State<Call> {
 
     peerConnection.onAddStream = (stream) {
       // Stream has been added; connect it to our renderer
+      logger.i("Got stream from remote; connecting it");
       _remoteRenderer.srcObject = stream;
+      _ready = true;
+      setState(() {});
     };
 
-    peerConnection.onIceCandidate = (candidate) {
+    peerConnection.onIceCandidate = (candidate) async {
       if (candidate.candidate == null) {
-        logger.i("Out of candidates");
+        await widget.client.createIceMessage(
+            CreateIceMessageRequest(
+                sessionIdentifier: clientSession.id,
+                iceMessage: IceMessage(
+                  noMoreCandidates: NoMoreCandidates(),
+                )),
+            options: callOptions);
         return;
       }
 
-      // Send the candidate on to the signaling server
+      await widget.client.createIceMessage(
+          pb.CreateIceMessageRequest(
+            sessionIdentifier: clientSession.id,
+            iceMessage: pb.IceMessage(
+              candidate: pb.IceCandidate(
+                candidate: candidate.candidate,
+                sdpMid: candidate.sdpMid,
+                sdpLineIndex: candidate.sdpMLineIndex,
+              ),
+            ),
+          ),
+          options: callOptions);
     };
 
-    peerConnection.onIceConnectionState = (state) {};
+    peerConnection.onIceConnectionState = (state) {
+      statusLine = "Ice state now $state";
+      setState(() {});
+      logger.i("Ice state now $state");
+
+      switch (state) {
+        case RTCIceConnectionState.RTCIceConnectionStateClosed:
+        case RTCIceConnectionState.RTCIceConnectionStateDisconnected:
+        case RTCIceConnectionState.RTCIceConnectionStateFailed:
+          cancelCreate.complete(CallCancelled());
+          _connect();
+        default:
+        // do nothing
+      }
+    };
+
+    peerConnection.onIceGatheringState = (state) async {
+      logger.i("ICE gathering state $state");
+      if (state == RTCIceGatheringState.RTCIceGatheringStateComplete) {
+        await widget.client.createIceMessage(
+            CreateIceMessageRequest(
+                sessionIdentifier: clientSession.id,
+                iceMessage: IceMessage(
+                  noMoreCandidates: NoMoreCandidates(),
+                )),
+            options: callOptions);
+      }
+    };
 
     peerConnection.onRemoveStream = (stream) {};
 
     peerConnection.onDataChannel = (channel) {};
 
-    // Get list of candidates from signaling server
-    for (final remoteCandidate in []) {
-      peerConnection.addCandidate(remoteCandidate);
-    }
     // This will find the intersection of my candidates and the remote,
     // then propose one to use
-    var offer = peerConnection.createOffer();
+    var offer = await peerConnection.createOffer();
+    await peerConnection.setLocalDescription(offer);
     // Send offer through signaling server
     logger.i("Offer is $offer");
+    await widget.client.createIceMessage(
+        pb.CreateIceMessageRequest(
+          sessionIdentifier: clientSession.id,
+          iceMessage: pb.IceMessage(
+            session: pb.IceSessionDescription(
+              sdp: offer.sdp,
+              sdpType: Int64(1), // offer
+            ),
+          ),
+        ),
+        options: callOptions);
 
-    var session = Session(peerConnection);
+    // Get candidates from remote
-    return session;
+    while (true) {
+      var someResponse = await Future.any([
+        widget.client.popIceMessage(
+            pb.PopIceMessageRequest(sessionIdentifier: clientSession.id),
+            options: callOptions),
+        cancelCreate.future,
+      ]);
+      if (someResponse is CallCancelled) {
+        break;
+      }
+      var resp = someResponse as pb.IceMessage;
+      if (resp.hasCandidate()) {
+        await peerConnection.addCandidate(RTCIceCandidate(
+            resp.candidate.candidate,
+            resp.candidate.sdpMid,
+            resp.candidate.sdpLineIndex));
+      } else if (resp.hasNoMoreCandidates()) {
+        logger.i("No more candidates from remote");
+      } else if (resp.hasSession()) {
+        var session = resp.session;
+        await peerConnection
+            .setRemoteDescription(RTCSessionDescription(session.sdp, "answer"));
+        break;
+      }
+    }
   }
 
   @override
   Widget build(BuildContext context) {
-    return RTCVideoView(_remoteRenderer);
+    return Column(children: [
+      Text(widget.cameraID.id),
+      Text(statusLine),
+      SizedBox(
+          height: 480,
+          child: _ready
+              ? RTCVideoView(_remoteRenderer)
+              : const Text("Loading...")),
+    ]);
   }
 }
 
-class Session {
+class CallCancelled {}
-  RTCPeerConnection peerConnection;
-
-  Session(this.peerConnection);
-  List<RTCIceCandidate> remoteCandidates = [];
-}

ui/lib/gen/signaler_service.pbenum.dart

@@ -0,0 +1,11 @@
+//
+//  Generated code. Do not modify.
+//  source: signaler_service.proto
+//
+// @dart = 2.12
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
+

ui/lib/gen/signaler_service.pbgrpc.dart

@@ -0,0 +1,159 @@
+//
+//  Generated code. Do not modify.
+//  source: signaler_service.proto
+//
+// @dart = 2.12
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
+
+import 'dart:async' as $async;
+import 'dart:core' as $core;
+
+import 'package:grpc/service_api.dart' as $grpc;
+import 'package:protobuf/protobuf.dart' as $pb;
+
+import 'signaler_service.pb.dart' as $0;
+
+export 'signaler_service.pb.dart';
+
+@$pb.GrpcServiceName('signaler.SignalerService')
+class SignalerServiceClient extends $grpc.Client {
+  static final _$createAuthToken = $grpc.ClientMethod<$0.CreateAuthTokenRequest, $0.AuthToken>(
+      '/signaler.SignalerService/CreateAuthToken',
+      ($0.CreateAuthTokenRequest value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.AuthToken.fromBuffer(value));
+  static final _$listCameras = $grpc.ClientMethod<$0.ListCamerasRequest, $0.ListCamerasResponse>(
+      '/signaler.SignalerService/ListCameras',
+      ($0.ListCamerasRequest value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.ListCamerasResponse.fromBuffer(value));
+  static final _$createSession = $grpc.ClientMethod<$0.CreateSessionRequest, $0.Session>(
+      '/signaler.SignalerService/CreateSession',
+      ($0.CreateSessionRequest value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.Session.fromBuffer(value));
+  static final _$popSession = $grpc.ClientMethod<$0.PopSessionRequest, $0.Session>(
+      '/signaler.SignalerService/PopSession',
+      ($0.PopSessionRequest value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.Session.fromBuffer(value));
+  static final _$createIceMessage = $grpc.ClientMethod<$0.CreateIceMessageRequest, $0.IceMessage>(
+      '/signaler.SignalerService/CreateIceMessage',
+      ($0.CreateIceMessageRequest value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.IceMessage.fromBuffer(value));
+  static final _$popIceMessage = $grpc.ClientMethod<$0.PopIceMessageRequest, $0.IceMessage>(
+      '/signaler.SignalerService/PopIceMessage',
+      ($0.PopIceMessageRequest value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.IceMessage.fromBuffer(value));
+
+  SignalerServiceClient($grpc.ClientChannel channel,
+      {$grpc.CallOptions? options,
+      $core.Iterable<$grpc.ClientInterceptor>? interceptors})
+      : super(channel, options: options,
+        interceptors: interceptors);
+
+  $grpc.ResponseFuture<$0.AuthToken> createAuthToken($0.CreateAuthTokenRequest request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$createAuthToken, request, options: options);
+  }
+
+  $grpc.ResponseFuture<$0.ListCamerasResponse> listCameras($0.ListCamerasRequest request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$listCameras, request, options: options);
+  }
+
+  $grpc.ResponseFuture<$0.Session> createSession($0.CreateSessionRequest request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$createSession, request, options: options);
+  }
+
+  $grpc.ResponseFuture<$0.Session> popSession($0.PopSessionRequest request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$popSession, request, options: options);
+  }
+
+  $grpc.ResponseFuture<$0.IceMessage> createIceMessage($0.CreateIceMessageRequest request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$createIceMessage, request, options: options);
+  }
+
+  $grpc.ResponseFuture<$0.IceMessage> popIceMessage($0.PopIceMessageRequest request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$popIceMessage, request, options: options);
+  }
+}
+
+@$pb.GrpcServiceName('signaler.SignalerService')
+abstract class SignalerServiceBase extends $grpc.Service {
+  $core.String get $name => 'signaler.SignalerService';
+
+  SignalerServiceBase() {
+    $addMethod($grpc.ServiceMethod<$0.CreateAuthTokenRequest, $0.AuthToken>(
+        'CreateAuthToken',
+        createAuthToken_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.CreateAuthTokenRequest.fromBuffer(value),
+        ($0.AuthToken value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.ListCamerasRequest, $0.ListCamerasResponse>(
+        'ListCameras',
+        listCameras_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.ListCamerasRequest.fromBuffer(value),
+        ($0.ListCamerasResponse value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.CreateSessionRequest, $0.Session>(
+        'CreateSession',
+        createSession_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.CreateSessionRequest.fromBuffer(value),
+        ($0.Session value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.PopSessionRequest, $0.Session>(
+        'PopSession',
+        popSession_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.PopSessionRequest.fromBuffer(value),
+        ($0.Session value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.CreateIceMessageRequest, $0.IceMessage>(
+        'CreateIceMessage',
+        createIceMessage_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.CreateIceMessageRequest.fromBuffer(value),
+        ($0.IceMessage value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.PopIceMessageRequest, $0.IceMessage>(
+        'PopIceMessage',
+        popIceMessage_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.PopIceMessageRequest.fromBuffer(value),
+        ($0.IceMessage value) => value.writeToBuffer()));
+  }
+
+  $async.Future<$0.AuthToken> createAuthToken_Pre($grpc.ServiceCall call, $async.Future<$0.CreateAuthTokenRequest> request) async {
+    return createAuthToken(call, await request);
+  }
+
+  $async.Future<$0.ListCamerasResponse> listCameras_Pre($grpc.ServiceCall call, $async.Future<$0.ListCamerasRequest> request) async {
+    return listCameras(call, await request);
+  }
+
+  $async.Future<$0.Session> createSession_Pre($grpc.ServiceCall call, $async.Future<$0.CreateSessionRequest> request) async {
+    return createSession(call, await request);
+  }
+
+  $async.Future<$0.Session> popSession_Pre($grpc.ServiceCall call, $async.Future<$0.PopSessionRequest> request) async {
+    return popSession(call, await request);
+  }
+
+  $async.Future<$0.IceMessage> createIceMessage_Pre($grpc.ServiceCall call, $async.Future<$0.CreateIceMessageRequest> request) async {
+    return createIceMessage(call, await request);
+  }
+
+  $async.Future<$0.IceMessage> popIceMessage_Pre($grpc.ServiceCall call, $async.Future<$0.PopIceMessageRequest> request) async {
+    return popIceMessage(call, await request);
+  }
+
+  $async.Future<$0.AuthToken> createAuthToken($grpc.ServiceCall call, $0.CreateAuthTokenRequest request);
+  $async.Future<$0.ListCamerasResponse> listCameras($grpc.ServiceCall call, $0.ListCamerasRequest request);
+  $async.Future<$0.Session> createSession($grpc.ServiceCall call, $0.CreateSessionRequest request);
+  $async.Future<$0.Session> popSession($grpc.ServiceCall call, $0.PopSessionRequest request);
+  $async.Future<$0.IceMessage> createIceMessage($grpc.ServiceCall call, $0.CreateIceMessageRequest request);
+  $async.Future<$0.IceMessage> popIceMessage($grpc.ServiceCall call, $0.PopIceMessageRequest request);
+}

ui/lib/gen/signaler_service.pbjson.dart

@@ -0,0 +1,286 @@
+//
+//  Generated code. Do not modify.
+//  source: signaler_service.proto
+//
+// @dart = 2.12
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
+
+import 'dart:convert' as $convert;
+import 'dart:core' as $core;
+import 'dart:typed_data' as $typed_data;
+
+@$core.Deprecated('Use createAuthTokenRequestDescriptor instead')
+const CreateAuthTokenRequest$json = {
+  '1': 'CreateAuthTokenRequest',
+  '2': [
+    {'1': 'home', '3': 1, '4': 1, '5': 9, '10': 'home'},
+    {'1': 'camera', '3': 2, '4': 1, '5': 11, '6': '.signaler.CreateAuthTokenRequest.Camera', '9': 0, '10': 'camera'},
+    {'1': 'client', '3': 3, '4': 1, '5': 11, '6': '.signaler.CreateAuthTokenRequest.Client', '9': 0, '10': 'client'},
+  ],
+  '3': [CreateAuthTokenRequest_Camera$json, CreateAuthTokenRequest_Client$json],
+  '8': [
+    {'1': 'type'},
+  ],
+};
+
+@$core.Deprecated('Use createAuthTokenRequestDescriptor instead')
+const CreateAuthTokenRequest_Camera$json = {
+  '1': 'Camera',
+  '2': [
+    {'1': 'id', '3': 1, '4': 1, '5': 9, '10': 'id'},
+  ],
+};
+
+@$core.Deprecated('Use createAuthTokenRequestDescriptor instead')
+const CreateAuthTokenRequest_Client$json = {
+  '1': 'Client',
+};
+
+/// Descriptor for `CreateAuthTokenRequest`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List createAuthTokenRequestDescriptor = $convert.base64Decode(
+    'ChZDcmVhdGVBdXRoVG9rZW5SZXF1ZXN0EhIKBGhvbWUYASABKAlSBGhvbWUSQQoGY2FtZXJhGA'
+    'IgASgLMicuc2lnbmFsZXIuQ3JlYXRlQXV0aFRva2VuUmVxdWVzdC5DYW1lcmFIAFIGY2FtZXJh'
+    'EkEKBmNsaWVudBgDIAEoCzInLnNpZ25hbGVyLkNyZWF0ZUF1dGhUb2tlblJlcXVlc3QuQ2xpZW'
+    '50SABSBmNsaWVudBoYCgZDYW1lcmESDgoCaWQYASABKAlSAmlkGggKBkNsaWVudEIGCgR0eXBl');
+
+@$core.Deprecated('Use listCamerasRequestDescriptor instead')
+const ListCamerasRequest$json = {
+  '1': 'ListCamerasRequest',
+};
+
+/// Descriptor for `ListCamerasRequest`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List listCamerasRequestDescriptor = $convert.base64Decode(
+    'ChJMaXN0Q2FtZXJhc1JlcXVlc3Q=');
+
+@$core.Deprecated('Use listCamerasResponseDescriptor instead')
+const ListCamerasResponse$json = {
+  '1': 'ListCamerasResponse',
+  '2': [
+    {'1': 'cameras', '3': 1, '4': 3, '5': 11, '6': '.signaler.Camera', '10': 'cameras'},
+  ],
+};
+
+/// Descriptor for `ListCamerasResponse`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List listCamerasResponseDescriptor = $convert.base64Decode(
+    'ChNMaXN0Q2FtZXJhc1Jlc3BvbnNlEioKB2NhbWVyYXMYASADKAsyEC5zaWduYWxlci5DYW1lcm'
+    'FSB2NhbWVyYXM=');
+
+@$core.Deprecated('Use createSessionRequestDescriptor instead')
+const CreateSessionRequest$json = {
+  '1': 'CreateSessionRequest',
+  '2': [
+    {'1': 'session', '3': 1, '4': 1, '5': 11, '6': '.signaler.Session', '10': 'session'},
+    {'1': 'wait_for_update', '3': 2, '4': 1, '5': 8, '10': 'waitForUpdate'},
+  ],
+};
+
+/// Descriptor for `CreateSessionRequest`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List createSessionRequestDescriptor = $convert.base64Decode(
+    'ChRDcmVhdGVTZXNzaW9uUmVxdWVzdBIrCgdzZXNzaW9uGAEgASgLMhEuc2lnbmFsZXIuU2Vzc2'
+    'lvblIHc2Vzc2lvbhImCg93YWl0X2Zvcl91cGRhdGUYAiABKAhSDXdhaXRGb3JVcGRhdGU=');
+
+@$core.Deprecated('Use popSessionRequestDescriptor instead')
+const PopSessionRequest$json = {
+  '1': 'PopSessionRequest',
+  '2': [
+    {'1': 'session', '3': 1, '4': 1, '5': 11, '6': '.signaler.Session', '10': 'session'},
+  ],
+};
+
+/// Descriptor for `PopSessionRequest`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List popSessionRequestDescriptor = $convert.base64Decode(
+    'ChFQb3BTZXNzaW9uUmVxdWVzdBIrCgdzZXNzaW9uGAEgASgLMhEuc2lnbmFsZXIuU2Vzc2lvbl'
+    'IHc2Vzc2lvbg==');
+
+@$core.Deprecated('Use updateSessionRequestDescriptor instead')
+const UpdateSessionRequest$json = {
+  '1': 'UpdateSessionRequest',
+  '2': [
+    {'1': 'session', '3': 1, '4': 1, '5': 11, '6': '.signaler.Session', '10': 'session'},
+    {'1': 'wait_for_update', '3': 2, '4': 1, '5': 8, '10': 'waitForUpdate'},
+  ],
+};
+
+/// Descriptor for `UpdateSessionRequest`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List updateSessionRequestDescriptor = $convert.base64Decode(
+    'ChRVcGRhdGVTZXNzaW9uUmVxdWVzdBIrCgdzZXNzaW9uGAEgASgLMhEuc2lnbmFsZXIuU2Vzc2'
+    'lvblIHc2Vzc2lvbhImCg93YWl0X2Zvcl91cGRhdGUYAiABKAhSDXdhaXRGb3JVcGRhdGU=');
+
+@$core.Deprecated('Use listSessionsRequestDescriptor instead')
+const ListSessionsRequest$json = {
+  '1': 'ListSessionsRequest',
+};
+
+/// Descriptor for `ListSessionsRequest`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List listSessionsRequestDescriptor = $convert.base64Decode(
+    'ChNMaXN0U2Vzc2lvbnNSZXF1ZXN0');
+
+@$core.Deprecated('Use listSessionsResponseDescriptor instead')
+const ListSessionsResponse$json = {
+  '1': 'ListSessionsResponse',
+  '2': [
+    {'1': 'sessions', '3': 1, '4': 3, '5': 11, '6': '.signaler.Session', '10': 'sessions'},
+  ],
+};
+
+/// Descriptor for `ListSessionsResponse`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List listSessionsResponseDescriptor = $convert.base64Decode(
+    'ChRMaXN0U2Vzc2lvbnNSZXNwb25zZRItCghzZXNzaW9ucxgBIAMoCzIRLnNpZ25hbGVyLlNlc3'
+    'Npb25SCHNlc3Npb25z');
+
+@$core.Deprecated('Use createIceMessageRequestDescriptor instead')
+const CreateIceMessageRequest$json = {
+  '1': 'CreateIceMessageRequest',
+  '2': [
+    {'1': 'session_identifier', '3': 1, '4': 1, '5': 11, '6': '.signaler.Session.Identifier', '10': 'sessionIdentifier'},
+    {'1': 'ice_message', '3': 2, '4': 1, '5': 11, '6': '.signaler.IceMessage', '10': 'iceMessage'},
+  ],
+};
+
+/// Descriptor for `CreateIceMessageRequest`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List createIceMessageRequestDescriptor = $convert.base64Decode(
+    'ChdDcmVhdGVJY2VNZXNzYWdlUmVxdWVzdBJLChJzZXNzaW9uX2lkZW50aWZpZXIYASABKAsyHC'
+    '5zaWduYWxlci5TZXNzaW9uLklkZW50aWZpZXJSEXNlc3Npb25JZGVudGlmaWVyEjUKC2ljZV9t'
+    'ZXNzYWdlGAIgASgLMhQuc2lnbmFsZXIuSWNlTWVzc2FnZVIKaWNlTWVzc2FnZQ==');
+
+@$core.Deprecated('Use popIceMessageRequestDescriptor instead')
+const PopIceMessageRequest$json = {
+  '1': 'PopIceMessageRequest',
+  '2': [
+    {'1': 'session_identifier', '3': 1, '4': 1, '5': 11, '6': '.signaler.Session.Identifier', '10': 'sessionIdentifier'},
+  ],
+};
+
+/// Descriptor for `PopIceMessageRequest`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List popIceMessageRequestDescriptor = $convert.base64Decode(
+    'ChRQb3BJY2VNZXNzYWdlUmVxdWVzdBJLChJzZXNzaW9uX2lkZW50aWZpZXIYASABKAsyHC5zaW'
+    'duYWxlci5TZXNzaW9uLklkZW50aWZpZXJSEXNlc3Npb25JZGVudGlmaWVy');
+
+@$core.Deprecated('Use cameraDescriptor instead')
+const Camera$json = {
+  '1': 'Camera',
+  '2': [
+    {'1': 'identifier', '3': 1, '4': 1, '5': 11, '6': '.signaler.Camera.Identifier', '10': 'identifier'},
+  ],
+  '3': [Camera_Identifier$json],
+};
+
+@$core.Deprecated('Use cameraDescriptor instead')
+const Camera_Identifier$json = {
+  '1': 'Identifier',
+  '2': [
+    {'1': 'id', '3': 1, '4': 1, '5': 9, '10': 'id'},
+  ],
+};
+
+/// Descriptor for `Camera`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List cameraDescriptor = $convert.base64Decode(
+    'CgZDYW1lcmESOwoKaWRlbnRpZmllchgBIAEoCzIbLnNpZ25hbGVyLkNhbWVyYS5JZGVudGlmaW'
+    'VyUgppZGVudGlmaWVyGhwKCklkZW50aWZpZXISDgoCaWQYASABKAlSAmlk');
+
+@$core.Deprecated('Use iceMessageDescriptor instead')
+const IceMessage$json = {
+  '1': 'IceMessage',
+  '2': [
+    {'1': 'candidate', '3': 1, '4': 1, '5': 11, '6': '.signaler.IceCandidate', '9': 0, '10': 'candidate'},
+    {'1': 'session', '3': 2, '4': 1, '5': 11, '6': '.signaler.IceSessionDescription', '9': 0, '10': 'session'},
+    {'1': 'no_more_candidates', '3': 3, '4': 1, '5': 11, '6': '.signaler.NoMoreCandidates', '9': 0, '10': 'noMoreCandidates'},
+  ],
+  '8': [
+    {'1': 'type'},
+  ],
+};
+
+/// Descriptor for `IceMessage`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List iceMessageDescriptor = $convert.base64Decode(
+    'CgpJY2VNZXNzYWdlEjYKCWNhbmRpZGF0ZRgBIAEoCzIWLnNpZ25hbGVyLkljZUNhbmRpZGF0ZU'
+    'gAUgljYW5kaWRhdGUSOwoHc2Vzc2lvbhgCIAEoCzIfLnNpZ25hbGVyLkljZVNlc3Npb25EZXNj'
+    'cmlwdGlvbkgAUgdzZXNzaW9uEkoKEm5vX21vcmVfY2FuZGlkYXRlcxgDIAEoCzIaLnNpZ25hbG'
+    'VyLk5vTW9yZUNhbmRpZGF0ZXNIAFIQbm9Nb3JlQ2FuZGlkYXRlc0IGCgR0eXBl');
+
+@$core.Deprecated('Use noMoreCandidatesDescriptor instead')
+const NoMoreCandidates$json = {
+  '1': 'NoMoreCandidates',
+};
+
+/// Descriptor for `NoMoreCandidates`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List noMoreCandidatesDescriptor = $convert.base64Decode(
+    'ChBOb01vcmVDYW5kaWRhdGVz');
+
+@$core.Deprecated('Use iceCandidateDescriptor instead')
+const IceCandidate$json = {
+  '1': 'IceCandidate',
+  '2': [
+    {'1': 'candidate', '3': 1, '4': 1, '5': 9, '10': 'candidate'},
+    {'1': 'sdp_mid', '3': 2, '4': 1, '5': 9, '9': 0, '10': 'sdpMid', '17': true},
+    {'1': 'sdp_line_index', '3': 3, '4': 1, '5': 5, '9': 1, '10': 'sdpLineIndex', '17': true},
+    {'1': 'username_fragment', '3': 4, '4': 1, '5': 9, '9': 2, '10': 'usernameFragment', '17': true},
+  ],
+  '8': [
+    {'1': '_sdp_mid'},
+    {'1': '_sdp_line_index'},
+    {'1': '_username_fragment'},
+  ],
+};
+
+/// Descriptor for `IceCandidate`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List iceCandidateDescriptor = $convert.base64Decode(
+    'CgxJY2VDYW5kaWRhdGUSHAoJY2FuZGlkYXRlGAEgASgJUgljYW5kaWRhdGUSHAoHc2RwX21pZB'
+    'gCIAEoCUgAUgZzZHBNaWSIAQESKQoOc2RwX2xpbmVfaW5kZXgYAyABKAVIAVIMc2RwTGluZUlu'
+    'ZGV4iAEBEjAKEXVzZXJuYW1lX2ZyYWdtZW50GAQgASgJSAJSEHVzZXJuYW1lRnJhZ21lbnSIAQ'
+    'FCCgoIX3NkcF9taWRCEQoPX3NkcF9saW5lX2luZGV4QhQKEl91c2VybmFtZV9mcmFnbWVudA==');
+
+@$core.Deprecated('Use iceSessionDescriptionDescriptor instead')
+const IceSessionDescription$json = {
+  '1': 'IceSessionDescription',
+  '2': [
+    {'1': 'sdp_type', '3': 1, '4': 1, '5': 3, '10': 'sdpType'},
+    {'1': 'sdp', '3': 2, '4': 1, '5': 9, '10': 'sdp'},
+  ],
+};
+
+/// Descriptor for `IceSessionDescription`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List iceSessionDescriptionDescriptor = $convert.base64Decode(
+    'ChVJY2VTZXNzaW9uRGVzY3JpcHRpb24SGQoIc2RwX3R5cGUYASABKANSB3NkcFR5cGUSEAoDc2'
+    'RwGAIgASgJUgNzZHA=');
+
+@$core.Deprecated('Use sessionDescriptor instead')
+const Session$json = {
+  '1': 'Session',
+  '2': [
+    {'1': 'id', '3': 1, '4': 1, '5': 11, '6': '.signaler.Session.Identifier', '10': 'id'},
+    {'1': 'camera', '3': 2, '4': 1, '5': 11, '6': '.signaler.Camera.Identifier', '10': 'camera'},
+  ],
+  '3': [Session_Identifier$json],
+};
+
+@$core.Deprecated('Use sessionDescriptor instead')
+const Session_Identifier$json = {
+  '1': 'Identifier',
+  '2': [
+    {'1': 'id', '3': 1, '4': 1, '5': 9, '10': 'id'},
+  ],
+};
+
+/// Descriptor for `Session`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List sessionDescriptor = $convert.base64Decode(
+    'CgdTZXNzaW9uEiwKAmlkGAEgASgLMhwuc2lnbmFsZXIuU2Vzc2lvbi5JZGVudGlmaWVyUgJpZB'
+    'IzCgZjYW1lcmEYAiABKAsyGy5zaWduYWxlci5DYW1lcmEuSWRlbnRpZmllclIGY2FtZXJhGhwK'
+    'CklkZW50aWZpZXISDgoCaWQYASABKAlSAmlk');
+
+@$core.Deprecated('Use authTokenDescriptor instead')
+const AuthToken$json = {
+  '1': 'AuthToken',
+  '2': [
+    {'1': 'token', '3': 1, '4': 1, '5': 9, '10': 'token'},
+  ],
+};
+
+/// Descriptor for `AuthToken`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List authTokenDescriptor = $convert.base64Decode(
+    'CglBdXRoVG9rZW4SFAoFdG9rZW4YASABKAlSBXRva2Vu');
+

ui/lib/gen/token/token.pb.dart

@@ -0,0 +1,82 @@
+//
+//  Generated code. Do not modify.
+//  source: token/token.proto
+//
+// @dart = 2.12
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
+
+import 'dart:core' as $core;
+
+import 'package:protobuf/protobuf.dart' as $pb;
+
+class AuthToken extends $pb.GeneratedMessage {
+  factory AuthToken({
+    $core.String? uid,
+    $core.String? home,
+  }) {
+    final $result = create();
+    if (uid != null) {
+      $result.uid = uid;
+    }
+    if (home != null) {
+      $result.home = home;
+    }
+    return $result;
+  }
+  AuthToken._() : super();
+  factory AuthToken.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory AuthToken.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(_omitMessageNames ? '' : 'AuthToken', package: const $pb.PackageName(_omitMessageNames ? '' : 'token'), createEmptyInstance: create)
+    ..aOS(1, _omitFieldNames ? '' : 'uid')
+    ..aOS(2, _omitFieldNames ? '' : 'home')
+    ..hasRequiredFields = false
+  ;
+
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  AuthToken clone() => AuthToken()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  AuthToken copyWith(void Function(AuthToken) updates) => super.copyWith((message) => updates(message as AuthToken)) as AuthToken;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static AuthToken create() => AuthToken._();
+  AuthToken createEmptyInstance() => create();
+  static $pb.PbList<AuthToken> createRepeated() => $pb.PbList<AuthToken>();
+  @$core.pragma('dart2js:noInline')
+  static AuthToken getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<AuthToken>(create);
+  static AuthToken? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  $core.String get uid => $_getSZ(0);
+  @$pb.TagNumber(1)
+  set uid($core.String v) { $_setString(0, v); }
+  @$pb.TagNumber(1)
+  $core.bool hasUid() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearUid() => clearField(1);
+
+  @$pb.TagNumber(2)
+  $core.String get home => $_getSZ(1);
+  @$pb.TagNumber(2)
+  set home($core.String v) { $_setString(1, v); }
+  @$pb.TagNumber(2)
+  $core.bool hasHome() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearHome() => clearField(2);
+}
+
+
+const _omitFieldNames = $core.bool.fromEnvironment('protobuf.omit_field_names');
+const _omitMessageNames = $core.bool.fromEnvironment('protobuf.omit_message_names');

ui/lib/gen/token/token.pbenum.dart

@@ -0,0 +1,11 @@
+//
+//  Generated code. Do not modify.
+//  source: token/token.proto
+//
+// @dart = 2.12
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
+

ui/lib/gen/token/token.pbjson.dart

@@ -0,0 +1,28 @@
+//
+//  Generated code. Do not modify.
+//  source: token/token.proto
+//
+// @dart = 2.12
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
+
+import 'dart:convert' as $convert;
+import 'dart:core' as $core;
+import 'dart:typed_data' as $typed_data;
+
+@$core.Deprecated('Use authTokenDescriptor instead')
+const AuthToken$json = {
+  '1': 'AuthToken',
+  '2': [
+    {'1': 'uid', '3': 1, '4': 1, '5': 9, '10': 'uid'},
+    {'1': 'home', '3': 2, '4': 1, '5': 9, '10': 'home'},
+  ],
+};
+
+/// Descriptor for `AuthToken`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List authTokenDescriptor = $convert.base64Decode(
+    'CglBdXRoVG9rZW4SEAoDdWlkGAEgASgJUgN1aWQSEgoEaG9tZRgCIAEoCVIEaG9tZQ==');
+

ui/lib/main.dart

@@ -1,12 +1,30 @@
 import 'package:flutter/material.dart';
+//import 'package:grpc/grpc_web.dart';
+import 'package:grpc/grpc.dart';
+import 'package:logger/logger.dart';
 import 'package:ui/call.dart';
+import 'package:ui/gen/signaler_service.pbgrpc.dart';
+import 'package:ui/session_service.dart';
 
-void main() {
+void main() async {
-  runApp(const MyApp());
+  Logger logger = Logger();
+  logger.i("Establishing connection...");
+  final channel = ClientChannel(
+    '192.168.0.65',
+    port: 8080,
+    options: const ChannelOptions(credentials: ChannelCredentials.insecure()),
+    channelShutdownHandler: () {
+      logger.e("Channel shutdown unexpectedly");
+    },
+  );
+  final stub = SignalerServiceClient(channel);
+  runApp(MyApp(stub, SessionService(stub)));
 }
 
 class MyApp extends StatelessWidget {
-  const MyApp({super.key});
+  final SignalerServiceClient client;
+  final SessionService sessionService;
+  const MyApp(this.client, this.sessionService, {super.key});
 
   // This widget is the root of your application.
   @override
@@ -32,13 +50,22 @@ class MyApp extends StatelessWidget {
         colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
         useMaterial3: true,
       ),
-      home: const MyHomePage(title: 'Flutter Demo Home Page'),
+      home: MyHomePage(
+        client,
+        sessionService,
+        title: 'Home Sensors',
+        home: "home1234",
+      ),
     );
   }
 }
 
 class MyHomePage extends StatefulWidget {
-  const MyHomePage({super.key, required this.title});
+  final SignalerServiceClient client;
+  final SessionService sessionService;
+  final String home;
+  const MyHomePage(this.client, this.sessionService,
+      {super.key, required this.title, required this.home});
 
   // This widget is the home page of your application. It is stateful, meaning
   // that it has a State object (defined below) that contains fields that affect
@@ -56,17 +83,38 @@ class MyHomePage extends StatefulWidget {
 }
 
 class _MyHomePageState extends State<MyHomePage> {
-  int _counter = 0;
+  String topMessage = "Creating session...";
+  List<Call> camerasToRender = [];
 
-  void _incrementCounter() {
+  @override
-    setState(() {
+  void initState() {
-      // This call to setState tells the Flutter framework that something has
+    super.initState();
-      // changed in this State, which causes it to rerun the build method below
+    _getSession();
-      // so that the display can reflect the updated values. If we changed
+    _listCameras();
-      // _counter without calling setState(), then the build method would not be
+  }
-      // called again, and so nothing would appear to happen.
+
-      _counter++;
+  _getSession() async {
+    var token = await widget.sessionService.getAuthToken(widget.home);
+    topMessage = "Created session $token";
+    setState(() {});
+  }
+
+  _listCameras() async {
+    var callOptions = CallOptions(metadata: {
+      'Authorization': await widget.sessionService.getAuthToken(widget.home)
     });
+    var cameras = await widget.client
+        .listCameras(ListCamerasRequest(), options: callOptions);
+
+    for (var camera in cameras.cameras) {
+      camerasToRender.add(Call(
+        widget.client,
+        widget.sessionService,
+        cameraID: camera.identifier,
+        home: widget.home,
+      ));
+    }
+    setState(() {});
   }
 
   @override
@@ -87,18 +135,15 @@ class _MyHomePageState extends State<MyHomePage> {
         // the App.build method, and use it to set our appbar title.
         title: Text(widget.title),
       ),
-      body: const Center(
+      body: Column(
         // Center is a layout widget. It takes a single child and positions it
         // in the middle of the parent.
-        child: Call(
+
-          host: '',
+        children: <Widget>[
+              Text(topMessage),
+            ] +
+            camerasToRender,
       ),
-      ),
-      floatingActionButton: FloatingActionButton(
-        onPressed: _incrementCounter,
-        tooltip: 'Increment',
-        child: const Icon(Icons.add),
-      ), // This trailing comma makes auto-formatting nicer for build methods.
     );
   }
 }

ui/lib/session_service.dart

@@ -0,0 +1,15 @@
+import 'package:grpc/grpc_or_grpcweb.dart';
+import 'package:ui/gen/signaler_service.pbgrpc.dart';
+
+class SessionService {
+  final SignalerServiceClient _stub;
+  final Map<String, ResponseFuture<AuthToken>> _authTokens = {};
+
+  SessionService(this._stub);
+
+  Future<String> getAuthToken(String cameraID) async {
+    var val = await _authTokens.putIfAbsent(cameraID,
+        () => _stub.createAuthToken(CreateAuthTokenRequest(home: cameraID)));
+    return "Bearer ${val.token}";
+  }
+}

ui/pubspec.lock

@@ -1,6 +1,22 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  archive:
+    dependency: transitive
+    description:
+      name: archive
+      sha256: "1227dc3efc4ea571eebb2dfb814506ed2cfb1d4b1b89fb918abdddde617ead3c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.4.0"
+  args:
+    dependency: transitive
+    description:
+      name: args
+      sha256: eef6c46b622e0494a36c5a12d10d77fb4e855501a91c1b9ef9339326e58f0596
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.4.2"
   async:
     dependency: transitive
     description:
@@ -41,6 +57,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.17.2"
+  convert:
+    dependency: transitive
+    description:
+      name: convert
+      sha256: "0f08b14755d163f6e2134cb58222dd25ea2a2ee8a195e53983d57c075324d592"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.1"
+  crypto:
+    dependency: transitive
+    description:
+      name: crypto
+      sha256: ff625774173754681d66daaf4a448684fb04b78f902da9cb3d308c19cc5e8bab
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.3"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -73,6 +105,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.0"
+  fixnum:
+    dependency: "direct main"
+    description:
+      name: fixnum
+      sha256: "25517a4deb0c03aa0f32fd12db525856438902d9c16536311e76cdc57b31d7d1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -99,6 +139,46 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.9.42+hotfix.1"
+  googleapis_auth:
+    dependency: transitive
+    description:
+      name: googleapis_auth
+      sha256: af7c3a3edf9d0de2e1e0a77e994fae0a581c525fa7012af4fa0d4a52ed9484da
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.1"
+  grpc:
+    dependency: "direct main"
+    description:
+      name: grpc
+      sha256: e93ee3bce45c134bf44e9728119102358c7cd69de7832d9a874e2e74eb8cab40
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.2.4"
+  http:
+    dependency: transitive
+    description:
+      name: http
+      sha256: "759d1a329847dd0f39226c688d3e06a6b8679668e350e2891a6474f8b4bb8525"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
+  http2:
+    dependency: transitive
+    description:
+      name: http2
+      sha256: "38db0c4aa9f1cd238a5d2e86aa0cc7cc91c77e0c6c94ba64bbe85e4ff732a952"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.0"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      sha256: "2aa08ce0341cc9b354a498388e30986515406668dbcc4f7c950c3e715496693b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.0.2"
   js:
     dependency: transitive
     description:
@@ -227,6 +307,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.6"
+  pointycastle:
+    dependency: transitive
+    description:
+      name: pointycastle
+      sha256: "7c1e5f0d23c9016c5bbd8b1473d0d3fb3fc851b876046039509e18e0c7485f2c"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.7.3"
+  protobuf:
+    dependency: "direct main"
+    description:
+      name: protobuf
+      sha256: "68645b24e0716782e58948f8467fd42a880f255096a821f9e7d0ec625b00c84d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.1.0"
   pub_semver:
     dependency: transitive
     description:
@@ -288,6 +384,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.6.0"
+  typed_data:
+    dependency: transitive
+    description:
+      name: typed_data
+      sha256: facc8d6582f16042dd49f2463ff1bd6e2c9ef9f3d5da3d9b087e244a7b564b3c
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.2"
   vector_math:
     dependency: transitive
     description:

ui/pubspec.yaml

@@ -37,6 +37,9 @@ dependencies:
   cupertino_icons: ^1.0.2
   flutter_webrtc: ^0.9.42+hotfix.1
   logger: ^2.0.2
+  protobuf: '>=2.0.0 <4.0.0'
+  grpc: ^3.2.4
+  fixnum: ^1.1.0
 
 dev_dependencies:
   flutter_test: