Create new exception base hierarchy for MQTT errors

hbmqtt/codecs/errors.py

@@ -1,8 +1,11 @@
 # Copyright (c) 2015 Nicolas JOUANIN
 #
 # See the file license.txt for copying permission.
-
+from hbmqtt.errors import MQTTException
-class CodecException(BaseException):
+class CodecException(MQTTException):
+    """
+    Exceptions thrown by encode/decode process
+    """
     pass
 
 class NoDataException(CodecException):

hbmqtt/errors.py

@@ -4,3 +4,9 @@
 
 class BrokerException(BaseException):
     pass
+
+class MQTTException(BaseException):
+    """
+    Base class for all errors refering to MQTT specifications
+    """
+    pass