fix

raspberry/roberto/Serial.py

@@ -4,7 +4,7 @@ import threading
 import serial
 
 class Serial(object):
-    self._callbacks = dict()
+    _callbacks = dict()
 
     def __init__(self, devicename='/dev/ttyUSB0', baudrate=115200):
         self.devicename = devicename
@@ -50,6 +50,7 @@ class Serial(object):
                     print(data)
                     command = data[0]
                     argument = data[2:]
+                    if command in data:
                         cb = self._callbacks[command]
                         if cb:
                             cb(argument)