serial.write should have a blocking wait if the serial port is busy

platypush/plugins/serial/__init__.py

@@ -131,9 +131,7 @@ class SerialPlugin(GpioSensorPlugin):
         if isinstance(data, str):
             data = data.encode('utf-8')
 
-        try:
-            serial_available = self.serial_lock.acquire(timeout=2)
-            if serial_available:
+        with self.serial_lock:
             try:
                 ser = self._get_serial()
             except:
@@ -142,8 +140,6 @@ class SerialPlugin(GpioSensorPlugin):
 
             self.logger.info('Writing {} to {}'.format(data, self.device))
             ser.write(data)
-        finally:
-            self.serial_lock.release()
 
 
 # vim:sw=4:ts=4:et: