check if command is a staticmethod

agent.py

@@ -20,6 +20,7 @@ from StringIO import StringIO
 from base64 import decodestring
 from shutil import rmtree, move
 from datetime import datetime
+from types import FunctionType
 
 from utils import SerialLineReceiverBase
 
@@ -355,6 +356,10 @@ class SerialLineReceiver(SerialLineReceiverBase):
         except AttributeError as e:
             raise AttributeError(u'Command not found: %s (%s)' % (command, e))
 
+        if not isinstance(func, FunctionType):
+            raise AttributeError("Command refers to non-static method %s." %
+                                 unicode(func))
+
         # check for unexpected keyword arguments
         argspec = getargspec(func)
         if argspec.keywords is None:  # _operation doesn't take ** args