add: sensors

cmd/watcher/watcher.go

@@ -14,6 +14,7 @@ import (
 	"connectrpc.com/connect"
 	pb "github.com/chathaway-codes/home-sensors/v2/gen"
 	servicepb "github.com/chathaway-codes/home-sensors/v2/gen/genconnect"
+	"github.com/chathaway-codes/home-sensors/v2/internal/sensors"
 	"github.com/chathaway-codes/home-sensors/v2/internal/video"
 	"github.com/pion/webrtc/v3"
 	"github.com/pion/webrtc/v3/pkg/media"
@@ -37,6 +38,11 @@ func main() {
 	if err != nil {
 		log.Fatal().Err(err).Msg("failed to get default video")
 	}
+
+	sensors, err := sensors.Default.Get()
+	if err != nil {
+		log.Fatal().Err(err).Msg("failed to get default sensor")
+	}
 	client := servicepb.NewSignalerServiceClient(http.DefaultClient, "http://192.168.0.65:8080/")
 	authToken, err := client.CreateAuthToken(ctx, connect.NewRequest(&pb.CreateAuthTokenRequest{
 		Home: "home1234",
@@ -54,6 +60,14 @@ func main() {
 	go vid.Run()
 	defer vid.Done()
 
+	go sensors.Run()
+	defer sensors.Done()
+
+	sensorCh, sensorDone := sensors.Join()
+	defer sensorDone()
+
+	go handleSensor(ctx, client, token, sensorCh)
+
 	// Create a new RTCPeerConnection
 	log.Info().Msg("waiting for connections")
 
@@ -67,6 +81,23 @@ func main() {
 	}
 }
 
+func handleSensor(ctx context.Context, client servicepb.SignalerServiceClient, token string, ch <-chan *pb.Sample) {
+	for {
+		var sample *pb.Sample
+		select {
+		case sample = <-ch:
+			// proceed
+		case <-ctx.Done():
+			return
+		}
+		if _, err := client.CreateSample(ctx, withAuth(token, &pb.CreateSampleRequest{
+			Sample: sample,
+		})); err != nil {
+			log.Error().Err(err).Msg("failed to create sample")
+		}
+	}
+}
+
 func handleSession(ctx context.Context, client servicepb.SignalerServiceClient, token string, session *connect.Response[pb.Session], vid *video.Video) {
 	var err error
 	log.Debug().Msg("new session")

gen/genconnect/signaler_service.connect.go

@@ -51,6 +51,12 @@ const (
 	// SignalerServicePopIceMessageProcedure is the fully-qualified name of the SignalerService's
 	// PopIceMessage RPC.
 	SignalerServicePopIceMessageProcedure = "/signaler.SignalerService/PopIceMessage"
+	// SignalerServiceCreateSampleProcedure is the fully-qualified name of the SignalerService's
+	// CreateSample RPC.
+	SignalerServiceCreateSampleProcedure = "/signaler.SignalerService/CreateSample"
+	// SignalerServiceListSamplesProcedure is the fully-qualified name of the SignalerService's
+	// ListSamples RPC.
+	SignalerServiceListSamplesProcedure = "/signaler.SignalerService/ListSamples"
 )
 
 // SignalerServiceClient is a client for the signaler.SignalerService service.
@@ -72,6 +78,12 @@ type SignalerServiceClient interface {
 	//
 	// If there are no messages, this blocks until one becomes available.
 	PopIceMessage(context.Context, *connect.Request[gen.PopIceMessageRequest]) (*connect.Response[gen.IceMessage], error)
+	// CreateSample creates a sample for the given camera.
+	// If called without an auth token indicating a camera, an error
+	// is returned.
+	// TODO: this should be moved to a seperate service
+	CreateSample(context.Context, *connect.Request[gen.CreateSampleRequest]) (*connect.Response[gen.Sample], error)
+	ListSamples(context.Context, *connect.Request[gen.ListSamplesRequest]) (*connect.Response[gen.ListSamplesResponse], error)
 }
 
 // NewSignalerServiceClient constructs a client for the signaler.SignalerService service. By
@@ -114,6 +126,16 @@ func NewSignalerServiceClient(httpClient connect.HTTPClient, baseURL string, opt
 			baseURL+SignalerServicePopIceMessageProcedure,
 			opts...,
 		),
+		createSample: connect.NewClient[gen.CreateSampleRequest, gen.Sample](
+			httpClient,
+			baseURL+SignalerServiceCreateSampleProcedure,
+			opts...,
+		),
+		listSamples: connect.NewClient[gen.ListSamplesRequest, gen.ListSamplesResponse](
+			httpClient,
+			baseURL+SignalerServiceListSamplesProcedure,
+			opts...,
+		),
 	}
 }
 
@@ -125,6 +147,8 @@ type signalerServiceClient struct {
 	popSession       *connect.Client[gen.PopSessionRequest, gen.Session]
 	createIceMessage *connect.Client[gen.CreateIceMessageRequest, gen.IceMessage]
 	popIceMessage    *connect.Client[gen.PopIceMessageRequest, gen.IceMessage]
+	createSample     *connect.Client[gen.CreateSampleRequest, gen.Sample]
+	listSamples      *connect.Client[gen.ListSamplesRequest, gen.ListSamplesResponse]
 }
 
 // CreateAuthToken calls signaler.SignalerService.CreateAuthToken.
@@ -157,6 +181,16 @@ func (c *signalerServiceClient) PopIceMessage(ctx context.Context, req *connect.
 	return c.popIceMessage.CallUnary(ctx, req)
 }
 
+// CreateSample calls signaler.SignalerService.CreateSample.
+func (c *signalerServiceClient) CreateSample(ctx context.Context, req *connect.Request[gen.CreateSampleRequest]) (*connect.Response[gen.Sample], error) {
+	return c.createSample.CallUnary(ctx, req)
+}
+
+// ListSamples calls signaler.SignalerService.ListSamples.
+func (c *signalerServiceClient) ListSamples(ctx context.Context, req *connect.Request[gen.ListSamplesRequest]) (*connect.Response[gen.ListSamplesResponse], error) {
+	return c.listSamples.CallUnary(ctx, req)
+}
+
 // SignalerServiceHandler is an implementation of the signaler.SignalerService service.
 type SignalerServiceHandler interface {
 	CreateAuthToken(context.Context, *connect.Request[gen.CreateAuthTokenRequest]) (*connect.Response[gen.AuthToken], error)
@@ -176,6 +210,12 @@ type SignalerServiceHandler interface {
 	//
 	// If there are no messages, this blocks until one becomes available.
 	PopIceMessage(context.Context, *connect.Request[gen.PopIceMessageRequest]) (*connect.Response[gen.IceMessage], error)
+	// CreateSample creates a sample for the given camera.
+	// If called without an auth token indicating a camera, an error
+	// is returned.
+	// TODO: this should be moved to a seperate service
+	CreateSample(context.Context, *connect.Request[gen.CreateSampleRequest]) (*connect.Response[gen.Sample], error)
+	ListSamples(context.Context, *connect.Request[gen.ListSamplesRequest]) (*connect.Response[gen.ListSamplesResponse], error)
 }
 
 // NewSignalerServiceHandler builds an HTTP handler from the service implementation. It returns the
@@ -214,6 +254,16 @@ func NewSignalerServiceHandler(svc SignalerServiceHandler, opts ...connect.Handl
 		svc.PopIceMessage,
 		opts...,
 	)
+	signalerServiceCreateSampleHandler := connect.NewUnaryHandler(
+		SignalerServiceCreateSampleProcedure,
+		svc.CreateSample,
+		opts...,
+	)
+	signalerServiceListSamplesHandler := connect.NewUnaryHandler(
+		SignalerServiceListSamplesProcedure,
+		svc.ListSamples,
+		opts...,
+	)
 	return "/signaler.SignalerService/", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		switch r.URL.Path {
 		case SignalerServiceCreateAuthTokenProcedure:
@@ -228,6 +278,10 @@ func NewSignalerServiceHandler(svc SignalerServiceHandler, opts ...connect.Handl
 			signalerServiceCreateIceMessageHandler.ServeHTTP(w, r)
 		case SignalerServicePopIceMessageProcedure:
 			signalerServicePopIceMessageHandler.ServeHTTP(w, r)
+		case SignalerServiceCreateSampleProcedure:
+			signalerServiceCreateSampleHandler.ServeHTTP(w, r)
+		case SignalerServiceListSamplesProcedure:
+			signalerServiceListSamplesHandler.ServeHTTP(w, r)
 		default:
 			http.NotFound(w, r)
 		}
@@ -260,3 +314,11 @@ func (UnimplementedSignalerServiceHandler) CreateIceMessage(context.Context, *co
 func (UnimplementedSignalerServiceHandler) PopIceMessage(context.Context, *connect.Request[gen.PopIceMessageRequest]) (*connect.Response[gen.IceMessage], error) {
 	return nil, connect.NewError(connect.CodeUnimplemented, errors.New("signaler.SignalerService.PopIceMessage is not implemented"))
 }
+
+func (UnimplementedSignalerServiceHandler) CreateSample(context.Context, *connect.Request[gen.CreateSampleRequest]) (*connect.Response[gen.Sample], error) {
+	return nil, connect.NewError(connect.CodeUnimplemented, errors.New("signaler.SignalerService.CreateSample is not implemented"))
+}
+
+func (UnimplementedSignalerServiceHandler) ListSamples(context.Context, *connect.Request[gen.ListSamplesRequest]) (*connect.Response[gen.ListSamplesResponse], error) {
+	return nil, connect.NewError(connect.CodeUnimplemented, errors.New("signaler.SignalerService.ListSamples is not implemented"))
+}

internal/sensors/sensors.go

@@ -0,0 +1,144 @@
+package sensors
+
+import (
+	"bufio"
+	"context"
+	"os/exec"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	pb "github.com/chathaway-codes/home-sensors/v2/gen"
+	"github.com/chathaway-codes/home-sensors/v2/internal/pipespy"
+	"github.com/chathaway-codes/home-sensors/v2/internal/watcher/config"
+	"github.com/google/uuid"
+	"github.com/rs/zerolog/log"
+)
+
+var Default = &Mod{}
+
+type Sensors struct {
+	mu         sync.Mutex
+	ctx        context.Context
+	readCmd    *exec.Cmd
+	cancelFunc func()
+	ticker     time.Ticker
+
+	listeners map[string]chan<- *pb.Sample
+}
+
+func New(cfg *config.Config) (*Sensors, error) {
+	ctx, cancelFunc := context.WithCancel(context.Background())
+	readCmd := exec.CommandContext(ctx, cfg.SensorCmd.Binary, cfg.SensorCmd.Arguments...)
+
+	ticker := time.NewTicker(time.Duration(cfg.SensorRateMS) * time.Millisecond)
+	return &Sensors{
+		ctx:        ctx,
+		cancelFunc: cancelFunc,
+		readCmd:    readCmd,
+		ticker:     *ticker,
+		// it would be better if sensors.Run handled sending to the server; to do that,
+		// it needs a connection and the auth token. I don't have a clean way of getting that
+		// right now.
+		listeners: make(map[string]chan<- *pb.Sample),
+	}, nil
+}
+
+func (v *Sensors) Run() {
+	pipe := pipespy.New()
+	snoop := pipe.Add(pipespy.NewCmd(v.readCmd)).Snoop()
+	defer snoop.Close()
+
+	cleanUp := pipe.Start()
+	defer func() {
+		errs := cleanUp()
+		for _, err := range errs {
+			log.Err(err).Send()
+		}
+	}()
+
+	scanner := bufio.NewScanner(snoop)
+	for scanner.Scan() {
+		line := scanner.Text()
+		parts := strings.Split(line, " ")
+		if len(parts) != 3 {
+			log.Error().Str("line", line).Msg("malformed line; expected 3 floats: humidity pressure temperature_c")
+		}
+		humidity, err := strconv.ParseFloat(parts[0], 64)
+		if err != nil {
+			log.Error().Err(err).Str("val", parts[0]).Msg("failed to parse humidity")
+		}
+		pressure, err := strconv.ParseFloat(parts[1], 64)
+		if err != nil {
+			log.Error().Err(err).Str("val", parts[1]).Msg("failed to parse pressure")
+		}
+		temperatureC, err := strconv.ParseFloat(parts[2], 64)
+		if err != nil {
+			log.Error().Err(err).Str("val", parts[2]).Msg("failed to parse temperature_c")
+		}
+
+		select {
+		case <-v.ticker.C:
+			func() {
+				v.mu.Lock()
+				defer v.mu.Unlock()
+
+				samples := []*pb.Sample{
+					{
+						Type:    pb.Sample_HUMIDITY,
+						Reading: humidity,
+					},
+					{
+						Type:    pb.Sample_PRESSURE,
+						Reading: pressure,
+					},
+					{
+						Type:    pb.Sample_TEMPERATURE_C,
+						Reading: temperatureC,
+					},
+				}
+
+				for _, listener := range v.listeners {
+					for _, sample := range samples {
+						listener <- sample
+					}
+				}
+			}()
+		default:
+			// do nothing
+		}
+	}
+}
+
+// Join will connect to a running stream.
+func (v *Sensors) Join() (<-chan *pb.Sample, func()) {
+	v.mu.Lock()
+	defer v.mu.Unlock()
+
+	myID := uuid.New().String()
+	ch := make(chan *pb.Sample)
+	v.listeners[myID] = ch
+
+	return ch, func() {
+		v.mu.Lock()
+		defer v.mu.Unlock()
+
+		delete(v.listeners, myID)
+	}
+}
+
+// Done stops the processing.
+func (v *Sensors) Done() {
+	v.cancelFunc()
+}
+
+type Mod struct{}
+
+func (m *Mod) Get() (*Sensors, error) {
+	cfg, err := config.Default.Get()
+	if err != nil {
+		return nil, err
+	}
+	return New(cfg)
+}

internal/watcher/config/config.go

@@ -19,6 +19,8 @@ type Cmd struct {
 type Config struct {
 	H264Cmd      *Cmd  `yaml:"h264"`
 	IVFCmd       *Cmd  `yaml:"ivf"`
+	SensorCmd    *Cmd  `yaml:"sensor"`
+	SensorRateMS int64 `yaml:"sensor_rate_ms"`
 }
 
 func New(source []byte) (*Config, error) {

pkg/signaler/signaler.go

@@ -37,6 +37,9 @@ type Server struct {
 
 	sessionsByCamera map[string]chan *session
 	sessionsById     map[string]*session
+
+	// Most recent sample
+	samplesByCamera map[string]map[pb.Sample_Type]*pb.Sample
 }
 
 func New() *Server {
@@ -44,6 +47,7 @@ func New() *Server {
 		camerasByHome:    make(map[string]map[string]*camera),
 		sessionsByCamera: make(map[string]chan *session),
 		sessionsById:     make(map[string]*session),
+		samplesByCamera:  make(map[string]map[pb.Sample_Type]*pb.Sample),
 	}
 	go s.cleanup()
 	return s
@@ -160,9 +164,11 @@ func (s *Server) PopSession(ctx context.Context, request *connect.Request[pb.Pop
 	s.mu.Lock()
 
 	if _, ok := s.camerasByHome[authToken.Home]; !ok {
+		s.mu.Unlock()
 		return nil, status.Errorf(codes.NotFound, "home %q not found", authToken.Home)
 	}
 	if _, ok := s.camerasByHome[authToken.Home][authToken.Uid]; !ok {
+		s.mu.Unlock()
 		return nil, status.Errorf(codes.Unauthenticated, "you are not a camera")
 	}
 
@@ -238,6 +244,65 @@ func (s *Server) PopIceMessage(ctx context.Context, request *connect.Request[pb.
 	return connect.NewResponse(msg), nil
 }
 
+func (s *Server) CreateSample(ctx context.Context, request *connect.Request[pb.CreateSampleRequest]) (*connect.Response[pb.Sample], error) {
+	authToken, err := getAuthToken(request)
+	if err != nil {
+		return nil, err
+	}
+
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if _, ok := s.camerasByHome[authToken.Home]; !ok {
+		return nil, status.Errorf(codes.NotFound, "home %q not found", authToken.Home)
+	}
+	cam, ok := s.camerasByHome[authToken.Home][authToken.Uid]
+	if !ok {
+		return nil, status.Errorf(codes.Unauthenticated, "you are not a camera")
+	}
+
+	if _, ok := s.samplesByCamera[authToken.Uid]; !ok {
+		s.samplesByCamera[authToken.Uid] = make(map[pb.Sample_Type]*pb.Sample)
+	}
+
+	sample := request.Msg.GetSample()
+	s.samplesByCamera[authToken.Uid][sample.Type] = &pb.Sample{
+		Type:    sample.Type,
+		Reading: sample.Reading,
+
+		CameraId: &pb.Camera_Identifier{
+			Id: cam.id,
+		},
+	}
+	return connect.NewResponse(s.samplesByCamera[authToken.Uid][sample.Type]), nil
+}
+
+func (s *Server) ListSamples(ctx context.Context, request *connect.Request[pb.ListSamplesRequest]) (*connect.Response[pb.ListSamplesResponse], error) {
+	authToken, err := getAuthToken(request)
+	if err != nil {
+		return nil, err
+	}
+
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if _, ok := s.camerasByHome[authToken.Home]; !ok {
+		return nil, status.Errorf(codes.NotFound, "home %q not found", authToken.Home)
+	}
+
+	var samples []*pb.Sample
+	for camera := range s.camerasByHome[authToken.Home] {
+		if sample, ok := s.samplesByCamera[camera]; ok {
+			for _, sample := range sample {
+				samples = append(samples, sample)
+			}
+		}
+	}
+	return connect.NewResponse(&pb.ListSamplesResponse{
+		Samples: samples,
+	}), nil
+}
+
 func (s *Server) cleanup() {
 	ticker := time.NewTicker(time.Minute * 5)
 	for t := range ticker.C {

proto/signaler_service.proto

@@ -23,6 +23,12 @@ service SignalerService {
     // If there are no messages, this blocks until one becomes available.
     rpc PopIceMessage(PopIceMessageRequest) returns (IceMessage);
 
+    // CreateSample creates a sample for the given camera.
+    // If called without an auth token indicating a camera, an error
+    // is returned.
+    // TODO: this should be moved to a seperate service
+    rpc CreateSample(CreateSampleRequest) returns (Sample);
+    rpc ListSamples(ListSamplesRequest) returns (ListSamplesResponse);
 }
 
 message CreateAuthTokenRequest{
@@ -85,6 +91,17 @@ message PopIceMessageRequest {
     Session.Identifier session_identifier = 1;
 }
 
+message CreateSampleRequest{
+    Sample sample = 1;
+}
+
+message ListSamplesRequest {
+}
+
+message ListSamplesResponse {
+    repeated Sample samples = 1;
+}
+
 message Camera {
     message Identifier {
         string id = 1;
@@ -127,3 +144,17 @@ message Session {
 message AuthToken {
     string token = 1;
 }
+
+message Sample{
+    enum Type {
+        UNSPECIFIED = 0;
+        TEMPERATURE_C = 1;
+        HUMIDITY = 2;
+        PRESSURE = 3;
+    }
+    Type type = 1;
+    double reading = 2;
+
+    // Read-only; will be ignored in CreateSample.
+    Camera.Identifier camera_id = 3;
+}

rpi_camera.yaml

@@ -0,0 +1,32 @@
+h264:
+  binary: "/usr/bin/libcamera-vid"
+  arguments:
+  - "-n"
+  - "-t"
+  - "0"
+  - "--codec"
+  - "h264"
+  - "--mode"
+  - "1640:1232"
+  - "--denoise"
+  - "off"
+  - "--inline"
+  - "-o"
+  - "-"
+ivf:
+  binary: "/usr/bin/ffmpeg"
+  arguments:
+  - "-i"
+  - "-"
+  - "-g"
+  - "30"
+  - "-b:v"
+  - "2M"
+  - "-f"
+  - "ivf"
+  - "-"
+sensor:
+  binary: "/usr/bin/python3"
+  arguments:
+  - "/home/charles/temperature.py"
+sensor_rate_ms: 10000

sample.yaml

@@ -14,3 +14,9 @@ ivf:
   - "-f"
   - "ivf"
   - "-"
+
+sensor:
+  binary: "/usr/bin/yes"
+  arguments:
+  - "44.33889713096721 1015.1977693083448 23.60542243081727"
+sensor_rate_ms: 10000

ui/lib/gen/signaler_service.pb.dart

@@ -14,6 +14,10 @@ import 'dart:core' as $core;
 import 'package:fixnum/fixnum.dart' as $fixnum;
 import 'package:protobuf/protobuf.dart' as $pb;
 
+import 'signaler_service.pbenum.dart';
+
+export 'signaler_service.pbenum.dart';
+
 class CreateAuthTokenRequest_Camera extends $pb.GeneratedMessage {
   factory CreateAuthTokenRequest_Camera({
     $core.String? id,
@@ -658,6 +662,134 @@ class PopIceMessageRequest extends $pb.GeneratedMessage {
   Session_Identifier ensureSessionIdentifier() => $_ensure(0);
 }
 
+class CreateSampleRequest extends $pb.GeneratedMessage {
+  factory CreateSampleRequest({
+    Sample? sample,
+  }) {
+    final $result = create();
+    if (sample != null) {
+      $result.sample = sample;
+    }
+    return $result;
+  }
+  CreateSampleRequest._() : super();
+  factory CreateSampleRequest.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory CreateSampleRequest.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(_omitMessageNames ? '' : 'CreateSampleRequest', package: const $pb.PackageName(_omitMessageNames ? '' : 'signaler'), createEmptyInstance: create)
+    ..aOM<Sample>(1, _omitFieldNames ? '' : 'sample', subBuilder: Sample.create)
+    ..hasRequiredFields = false
+  ;
+
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  CreateSampleRequest clone() => CreateSampleRequest()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  CreateSampleRequest copyWith(void Function(CreateSampleRequest) updates) => super.copyWith((message) => updates(message as CreateSampleRequest)) as CreateSampleRequest;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static CreateSampleRequest create() => CreateSampleRequest._();
+  CreateSampleRequest createEmptyInstance() => create();
+  static $pb.PbList<CreateSampleRequest> createRepeated() => $pb.PbList<CreateSampleRequest>();
+  @$core.pragma('dart2js:noInline')
+  static CreateSampleRequest getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<CreateSampleRequest>(create);
+  static CreateSampleRequest? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  Sample get sample => $_getN(0);
+  @$pb.TagNumber(1)
+  set sample(Sample v) { setField(1, v); }
+  @$pb.TagNumber(1)
+  $core.bool hasSample() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearSample() => clearField(1);
+  @$pb.TagNumber(1)
+  Sample ensureSample() => $_ensure(0);
+}
+
+class ListSamplesRequest extends $pb.GeneratedMessage {
+  factory ListSamplesRequest() => create();
+  ListSamplesRequest._() : super();
+  factory ListSamplesRequest.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory ListSamplesRequest.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(_omitMessageNames ? '' : 'ListSamplesRequest', package: const $pb.PackageName(_omitMessageNames ? '' : 'signaler'), createEmptyInstance: create)
+    ..hasRequiredFields = false
+  ;
+
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  ListSamplesRequest clone() => ListSamplesRequest()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  ListSamplesRequest copyWith(void Function(ListSamplesRequest) updates) => super.copyWith((message) => updates(message as ListSamplesRequest)) as ListSamplesRequest;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static ListSamplesRequest create() => ListSamplesRequest._();
+  ListSamplesRequest createEmptyInstance() => create();
+  static $pb.PbList<ListSamplesRequest> createRepeated() => $pb.PbList<ListSamplesRequest>();
+  @$core.pragma('dart2js:noInline')
+  static ListSamplesRequest getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<ListSamplesRequest>(create);
+  static ListSamplesRequest? _defaultInstance;
+}
+
+class ListSamplesResponse extends $pb.GeneratedMessage {
+  factory ListSamplesResponse({
+    $core.Iterable<Sample>? samples,
+  }) {
+    final $result = create();
+    if (samples != null) {
+      $result.samples.addAll(samples);
+    }
+    return $result;
+  }
+  ListSamplesResponse._() : super();
+  factory ListSamplesResponse.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory ListSamplesResponse.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(_omitMessageNames ? '' : 'ListSamplesResponse', package: const $pb.PackageName(_omitMessageNames ? '' : 'signaler'), createEmptyInstance: create)
+    ..pc<Sample>(1, _omitFieldNames ? '' : 'samples', $pb.PbFieldType.PM, subBuilder: Sample.create)
+    ..hasRequiredFields = false
+  ;
+
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  ListSamplesResponse clone() => ListSamplesResponse()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  ListSamplesResponse copyWith(void Function(ListSamplesResponse) updates) => super.copyWith((message) => updates(message as ListSamplesResponse)) as ListSamplesResponse;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static ListSamplesResponse create() => ListSamplesResponse._();
+  ListSamplesResponse createEmptyInstance() => create();
+  static $pb.PbList<ListSamplesResponse> createRepeated() => $pb.PbList<ListSamplesResponse>();
+  @$core.pragma('dart2js:noInline')
+  static ListSamplesResponse getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<ListSamplesResponse>(create);
+  static ListSamplesResponse? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  $core.List<Sample> get samples => $_getList(0);
+}
+
 class Camera_Identifier extends $pb.GeneratedMessage {
   factory Camera_Identifier({
     $core.String? id,
@@ -1219,6 +1351,86 @@ class AuthToken extends $pb.GeneratedMessage {
   void clearToken() => clearField(1);
 }
 
+class Sample extends $pb.GeneratedMessage {
+  factory Sample({
+    Sample_Type? type,
+    $core.double? reading,
+    Camera_Identifier? cameraId,
+  }) {
+    final $result = create();
+    if (type != null) {
+      $result.type = type;
+    }
+    if (reading != null) {
+      $result.reading = reading;
+    }
+    if (cameraId != null) {
+      $result.cameraId = cameraId;
+    }
+    return $result;
+  }
+  Sample._() : super();
+  factory Sample.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory Sample.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(_omitMessageNames ? '' : 'Sample', package: const $pb.PackageName(_omitMessageNames ? '' : 'signaler'), createEmptyInstance: create)
+    ..e<Sample_Type>(1, _omitFieldNames ? '' : 'type', $pb.PbFieldType.OE, defaultOrMaker: Sample_Type.UNSPECIFIED, valueOf: Sample_Type.valueOf, enumValues: Sample_Type.values)
+    ..a<$core.double>(2, _omitFieldNames ? '' : 'reading', $pb.PbFieldType.OD)
+    ..aOM<Camera_Identifier>(3, _omitFieldNames ? '' : 'cameraId', subBuilder: Camera_Identifier.create)
+    ..hasRequiredFields = false
+  ;
+
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  Sample clone() => Sample()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  Sample copyWith(void Function(Sample) updates) => super.copyWith((message) => updates(message as Sample)) as Sample;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static Sample create() => Sample._();
+  Sample createEmptyInstance() => create();
+  static $pb.PbList<Sample> createRepeated() => $pb.PbList<Sample>();
+  @$core.pragma('dart2js:noInline')
+  static Sample getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<Sample>(create);
+  static Sample? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  Sample_Type get type => $_getN(0);
+  @$pb.TagNumber(1)
+  set type(Sample_Type v) { setField(1, v); }
+  @$pb.TagNumber(1)
+  $core.bool hasType() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearType() => clearField(1);
+
+  @$pb.TagNumber(2)
+  $core.double get reading => $_getN(1);
+  @$pb.TagNumber(2)
+  set reading($core.double v) { $_setDouble(1, v); }
+  @$pb.TagNumber(2)
+  $core.bool hasReading() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearReading() => clearField(2);
+
+  @$pb.TagNumber(3)
+  Camera_Identifier get cameraId => $_getN(2);
+  @$pb.TagNumber(3)
+  set cameraId(Camera_Identifier v) { setField(3, v); }
+  @$pb.TagNumber(3)
+  $core.bool hasCameraId() => $_has(2);
+  @$pb.TagNumber(3)
+  void clearCameraId() => clearField(3);
+  @$pb.TagNumber(3)
+  Camera_Identifier ensureCameraId() => $_ensure(2);
+}
+
 
 const _omitFieldNames = $core.bool.fromEnvironment('protobuf.omit_field_names');
 const _omitMessageNames = $core.bool.fromEnvironment('protobuf.omit_message_names');

ui/lib/gen/signaler_service.pbenum.dart

@@ -9,3 +9,28 @@
 // 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 Sample_Type extends $pb.ProtobufEnum {
+  static const Sample_Type UNSPECIFIED = Sample_Type._(0, _omitEnumNames ? '' : 'UNSPECIFIED');
+  static const Sample_Type TEMPERATURE_C = Sample_Type._(1, _omitEnumNames ? '' : 'TEMPERATURE_C');
+  static const Sample_Type HUMIDITY = Sample_Type._(2, _omitEnumNames ? '' : 'HUMIDITY');
+  static const Sample_Type PRESSURE = Sample_Type._(3, _omitEnumNames ? '' : 'PRESSURE');
+
+  static const $core.List<Sample_Type> values = <Sample_Type> [
+    UNSPECIFIED,
+    TEMPERATURE_C,
+    HUMIDITY,
+    PRESSURE,
+  ];
+
+  static final $core.Map<$core.int, Sample_Type> _byValue = $pb.ProtobufEnum.initByValue(values);
+  static Sample_Type? valueOf($core.int value) => _byValue[value];
+
+  const Sample_Type._($core.int v, $core.String n) : super(v, n);
+}
+
+
+const _omitEnumNames = $core.bool.fromEnvironment('protobuf.omit_enum_names');

ui/lib/gen/signaler_service.pbgrpc.dart

@@ -45,6 +45,14 @@ class SignalerServiceClient extends $grpc.Client {
       '/signaler.SignalerService/PopIceMessage',
       ($0.PopIceMessageRequest value) => value.writeToBuffer(),
       ($core.List<$core.int> value) => $0.IceMessage.fromBuffer(value));
+  static final _$createSample = $grpc.ClientMethod<$0.CreateSampleRequest, $0.Sample>(
+      '/signaler.SignalerService/CreateSample',
+      ($0.CreateSampleRequest value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.Sample.fromBuffer(value));
+  static final _$listSamples = $grpc.ClientMethod<$0.ListSamplesRequest, $0.ListSamplesResponse>(
+      '/signaler.SignalerService/ListSamples',
+      ($0.ListSamplesRequest value) => value.writeToBuffer(),
+      ($core.List<$core.int> value) => $0.ListSamplesResponse.fromBuffer(value));
 
   SignalerServiceClient($grpc.ClientChannel channel,
       {$grpc.CallOptions? options,
@@ -75,6 +83,14 @@ class SignalerServiceClient extends $grpc.Client {
   $grpc.ResponseFuture<$0.IceMessage> popIceMessage($0.PopIceMessageRequest request, {$grpc.CallOptions? options}) {
     return $createUnaryCall(_$popIceMessage, request, options: options);
   }
+
+  $grpc.ResponseFuture<$0.Sample> createSample($0.CreateSampleRequest request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$createSample, request, options: options);
+  }
+
+  $grpc.ResponseFuture<$0.ListSamplesResponse> listSamples($0.ListSamplesRequest request, {$grpc.CallOptions? options}) {
+    return $createUnaryCall(_$listSamples, request, options: options);
+  }
 }
 
 @$pb.GrpcServiceName('signaler.SignalerService')
@@ -124,6 +140,20 @@ abstract class SignalerServiceBase extends $grpc.Service {
         false,
         ($core.List<$core.int> value) => $0.PopIceMessageRequest.fromBuffer(value),
         ($0.IceMessage value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.CreateSampleRequest, $0.Sample>(
+        'CreateSample',
+        createSample_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.CreateSampleRequest.fromBuffer(value),
+        ($0.Sample value) => value.writeToBuffer()));
+    $addMethod($grpc.ServiceMethod<$0.ListSamplesRequest, $0.ListSamplesResponse>(
+        'ListSamples',
+        listSamples_Pre,
+        false,
+        false,
+        ($core.List<$core.int> value) => $0.ListSamplesRequest.fromBuffer(value),
+        ($0.ListSamplesResponse value) => value.writeToBuffer()));
   }
 
   $async.Future<$0.AuthToken> createAuthToken_Pre($grpc.ServiceCall call, $async.Future<$0.CreateAuthTokenRequest> request) async {
@@ -150,10 +180,20 @@ abstract class SignalerServiceBase extends $grpc.Service {
     return popIceMessage(call, await request);
   }
 
+  $async.Future<$0.Sample> createSample_Pre($grpc.ServiceCall call, $async.Future<$0.CreateSampleRequest> request) async {
+    return createSample(call, await request);
+  }
+
+  $async.Future<$0.ListSamplesResponse> listSamples_Pre($grpc.ServiceCall call, $async.Future<$0.ListSamplesRequest> request) async {
+    return listSamples(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);
+  $async.Future<$0.Sample> createSample($grpc.ServiceCall call, $0.CreateSampleRequest request);
+  $async.Future<$0.ListSamplesResponse> listSamples($grpc.ServiceCall call, $0.ListSamplesRequest request);
 }

ui/lib/gen/signaler_service.pbjson.dart

@@ -160,6 +160,41 @@ final $typed_data.Uint8List popIceMessageRequestDescriptor = $convert.base64Deco
     'ChRQb3BJY2VNZXNzYWdlUmVxdWVzdBJLChJzZXNzaW9uX2lkZW50aWZpZXIYASABKAsyHC5zaW'
     'duYWxlci5TZXNzaW9uLklkZW50aWZpZXJSEXNlc3Npb25JZGVudGlmaWVy');
 
+@$core.Deprecated('Use createSampleRequestDescriptor instead')
+const CreateSampleRequest$json = {
+  '1': 'CreateSampleRequest',
+  '2': [
+    {'1': 'sample', '3': 1, '4': 1, '5': 11, '6': '.signaler.Sample', '10': 'sample'},
+  ],
+};
+
+/// Descriptor for `CreateSampleRequest`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List createSampleRequestDescriptor = $convert.base64Decode(
+    'ChNDcmVhdGVTYW1wbGVSZXF1ZXN0EigKBnNhbXBsZRgBIAEoCzIQLnNpZ25hbGVyLlNhbXBsZV'
+    'IGc2FtcGxl');
+
+@$core.Deprecated('Use listSamplesRequestDescriptor instead')
+const ListSamplesRequest$json = {
+  '1': 'ListSamplesRequest',
+};
+
+/// Descriptor for `ListSamplesRequest`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List listSamplesRequestDescriptor = $convert.base64Decode(
+    'ChJMaXN0U2FtcGxlc1JlcXVlc3Q=');
+
+@$core.Deprecated('Use listSamplesResponseDescriptor instead')
+const ListSamplesResponse$json = {
+  '1': 'ListSamplesResponse',
+  '2': [
+    {'1': 'samples', '3': 1, '4': 3, '5': 11, '6': '.signaler.Sample', '10': 'samples'},
+  ],
+};
+
+/// Descriptor for `ListSamplesResponse`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List listSamplesResponseDescriptor = $convert.base64Decode(
+    'ChNMaXN0U2FtcGxlc1Jlc3BvbnNlEioKB3NhbXBsZXMYASADKAsyEC5zaWduYWxlci5TYW1wbG'
+    'VSB3NhbXBsZXM=');
+
 @$core.Deprecated('Use cameraDescriptor instead')
 const Camera$json = {
   '1': 'Camera',
@@ -284,3 +319,32 @@ const AuthToken$json = {
 final $typed_data.Uint8List authTokenDescriptor = $convert.base64Decode(
     'CglBdXRoVG9rZW4SFAoFdG9rZW4YASABKAlSBXRva2Vu');
 
+@$core.Deprecated('Use sampleDescriptor instead')
+const Sample$json = {
+  '1': 'Sample',
+  '2': [
+    {'1': 'type', '3': 1, '4': 1, '5': 14, '6': '.signaler.Sample.Type', '10': 'type'},
+    {'1': 'reading', '3': 2, '4': 1, '5': 1, '10': 'reading'},
+    {'1': 'camera_id', '3': 3, '4': 1, '5': 11, '6': '.signaler.Camera.Identifier', '10': 'cameraId'},
+  ],
+  '4': [Sample_Type$json],
+};
+
+@$core.Deprecated('Use sampleDescriptor instead')
+const Sample_Type$json = {
+  '1': 'Type',
+  '2': [
+    {'1': 'UNSPECIFIED', '2': 0},
+    {'1': 'TEMPERATURE_C', '2': 1},
+    {'1': 'HUMIDITY', '2': 2},
+    {'1': 'PRESSURE', '2': 3},
+  ],
+};
+
+/// Descriptor for `Sample`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List sampleDescriptor = $convert.base64Decode(
+    'CgZTYW1wbGUSKQoEdHlwZRgBIAEoDjIVLnNpZ25hbGVyLlNhbXBsZS5UeXBlUgR0eXBlEhgKB3'
+    'JlYWRpbmcYAiABKAFSB3JlYWRpbmcSOAoJY2FtZXJhX2lkGAMgASgLMhsuc2lnbmFsZXIuQ2Ft'
+    'ZXJhLklkZW50aWZpZXJSCGNhbWVyYUlkIkYKBFR5cGUSDwoLVU5TUEVDSUZJRUQQABIRCg1URU'
+    '1QRVJBVFVSRV9DEAESDAoISFVNSURJVFkQAhIMCghQUkVTU1VSRRAD');
+