a bit more robust.

cmd/bridge/main.go

@@ -3,12 +3,29 @@ package main
 import (
 	"context"
 	"fmt"
+	"io"
 
 	"github.com/half2me/antgo/ant"
 	"github.com/half2me/antgo/device"
 	"github.com/half2me/antgo/driver/usb"
 )
 
+func resetAndWait(drv io.ReadWriter) error {
+	if _, err := drv.Write(ant.SystemResetMessage()); err != nil {
+		return err
+	}
+	// drain until we see the startup message (0x6F)
+	for {
+		msg, err := ant.ReadMsg(drv)
+		if err != nil {
+			return err
+		}
+		if msg.Class() == ant.MESSAGE_STARTUP {
+			return nil
+		}
+	}
+}
+
 func main() {
 	drv, err := usb.GetDevice(0x0fcf, 0x1008)
 	if err != nil {
@@ -18,13 +35,11 @@ func main() {
 
 	fmt.Println("device opened")
 
-	if err := device.ResetWait(drv); err != nil {
-		panic(fmt.Sprintf("reset failed: %v", err))
+	if err := resetAndWait(drv); err != nil {
+		panic(err)
 	}
-	fmt.Println("reset ok")
-
 	if err := device.StartRxScanModeWait(drv); err != nil {
-		panic(fmt.Sprintf("scan mode failed: %v", err))
+		panic(err)
 	}
 	fmt.Println("scan mode started")
 
@@ -39,7 +54,8 @@ func main() {
 		switch msg.DeviceType() {
 		case ant.DEVICE_TYPE_POWER:
 			cur := ant.PowerMessage(msg)
-			fmt.Printf("power: %dW  cadence: %d rpm\n", cur.InstantaneousPower(), cur.InstantaneousCadence())
+			fmt.Printf("%v: power: %dW  cadence: %d rpm\n",
+				msg.DeviceNumber(), cur.InstantaneousPower(), cur.InstantaneousCadence())
 		}
 	}