Add debug logging

dfu.go

@@ -313,6 +313,7 @@ func (dfu *DFU) Reset() {
 // on waits for the given command to be received on
 // the control point characteristic, then runs the callback.
 func (dfu *DFU) on(cmd []byte, onCmdCb func(data []byte) error) error {
+	log.Debug().Hex("expecting", cmd).Msg("Waiting for command")
 	// Use for loop in case of invalid property
 	for {
 		select {
@@ -324,6 +325,10 @@ func (dfu *DFU) on(cmd []byte, onCmdCb func(data []byte) error) error {
 			}
 			// Assert propery value as byte slice
 			data := propChanged.Value.([]byte)
+			log.Debug().
+				Hex("expecting", cmd).
+				Hex("received", data).
+				Msg("Received command")
 			// If command has prefix of given command
 			if bytes.HasPrefix(data, cmd) {
 				// Return callback with data after command
@@ -408,6 +413,7 @@ func (dfu *DFU) stepSeven() error {
 			if err != nil {
 				return err
 			}
+			log.Debug().Msg("Sent firmware image segment")
 			// Increment bytes sent by amount read
 			dfu.bytesSent += len(segment)
 		}
@@ -415,6 +421,10 @@ func (dfu *DFU) stepSeven() error {
 		err := dfu.on(DFUNotifPktRecvd, func(data []byte) error {
 			// Set bytes received to data returned by InfiniTime
 			dfu.bytesRecvd = int(binary.LittleEndian.Uint32(data))
+			log.Debug().
+				Int("sent", dfu.bytesSent).
+				Int("rcvd", dfu.bytesRecvd).
+				Msg("Received packet receipt notification")
 			if dfu.bytesRecvd != dfu.bytesSent {
 				return ErrDFUSizeMismatch
 			}