Broadcast discovery with InfoAll, interface broadcast detection, clean output

lib/client/serial.go

@@ -61,6 +61,8 @@ func (t *serialTransport) Reader() io.Reader {
 	return t.port
 }
 
+func (t *serialTransport) Broadcast() bool { return false }
+
 func (t *serialTransport) Close() error {
 	return t.port.Close()
 }