workaround for when the trainer stops transmitting. ListenForTrainer now

restarts after not having received data for 10 seconds.

cmd/bridge/ant.go

@@ -34,7 +34,6 @@ func resetAndWait(drv io.ReadWriter) error {
 
 func ListenForTrainer(vendorId uint16, productId uint16, deviceNumber uint32,
 	events chan<- Event) {
-	defer close(events)
 
 	drv, err := usb.GetDevice(gousb.ID(vendorId), gousb.ID(productId))
 	if err != nil {
@@ -53,10 +52,17 @@ func ListenForTrainer(vendorId uint16, productId uint16, deviceNumber uint32,
 	logMsg("ant: scan mode started")
 
 	msgs := make(chan ant.BroadcastMessage, 100)
-	go device.DumpBroadcastMessages(context.Background(), drv, msgs)
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	go func() {
+		device.DumpBroadcastMessages(ctx, drv, msgs)
+		logMsg("ant: dump broadcast messages ended")
+	}()
 
 	logMsg("ant: listening...")
-	for msg := range msgs {
+	for {
+		select {
+		case msg := <-msgs:
 			if deviceNumber != 0 && msg.DeviceNumber() != deviceNumber {
 				logPrintf("ant: received msg from ignored device %v\n", msg.DeviceNumber())
 				continue
@@ -84,5 +90,9 @@ func ListenForTrainer(vendorId uint16, productId uint16, deviceNumber uint32,
 					logPrintf("ant: dropped event, buffer full\n")
 				}
 			}
+		case <-time.After(10 * time.Second):
+			logMsg("ant: no more messages arrived, restarting")
+			return
+		}
 	}
 }

cmd/bridge/cli.go

@@ -81,7 +81,11 @@ This allows these trainers to be used with modern devices that don't support ANT
 			}
 
 			events := make(chan Event, 1)
-			go ListenForTrainer(uint16(c.vendorID), uint16(c.productID), c.deviceNumber, events)
+			go func() {
+				for {
+					ListenForTrainer(uint16(c.vendorID), uint16(c.productID), c.deviceNumber, events)
+				}
+			}()
 			ExposeBluetooth(events)
 
 			return nil