fix message parsing

Author: lynxis

lowerlayer.py

@@ -183,13 +183,13 @@ def handleNotification(self, handle, data):
             if not message_type in MESSAGES:
                 self._error("Can not find Message")
                 return
-            message_cls = MESSAGE[message_type]
+            message_cls = MESSAGES[message_type]
             message = message_cls.decode(message)
             LOG.info("Received decoded message %s", message)
             if self._recv_cb:
                 self._recv_cb(message)
-        except:
-            LOG.info("Receive exception")
+        except Exception as exp:
+            LOG.info("Receive exception %s", exp)
             if self.ignore_invalid:
                 return