Introduce intent for TFW messages and fix FSM related bugs

tfw/internals/networking/__init__.py

@@ -2,3 +2,4 @@ from .serialization import serialize_tfw_msg, deserialize_tfw_msg, with_deserial
 from .zmq_connector import ZMQConnector, ZMQDownlinkConnector, ZMQUplinkConnector
 from .zmq_listener import ZMQListener
 from .scope import Scope
+from .intent import Intent

tfw/internals/networking/intent.py

@@ -0,0 +1,6 @@
+from enum import Enum
+
+
+class Intent(Enum):
+    CONTROL = 'control'
+    EVENT = 'event'

tfw/internals/networking/zmq_connector.py

@@ -4,6 +4,7 @@ import zmq
 from zmq.eventloop.zmqstream import ZMQStream
 
 from .scope import Scope
+from .intent import Intent
 from .serialization import (
     serialize_tfw_msg,
     deserialize_tfw_msg,
@@ -51,8 +52,10 @@ class ZMQUplinkConnector:
         self._zmq_push_socket.setsockopt(zmq.SNDHWM, 0)
         self._zmq_push_socket.connect(connect_addr)
 
-    def send_message(self, message, scope=Scope.ZMQ):
+    def send_message(self, message, scope=Scope.ZMQ, intent=None):
         message['scope'] = scope.value
+        if isinstance(intent, Intent):
+            message['intent'] = intent.value
         self._zmq_push_socket.send_multipart(serialize_tfw_msg(message))
 
     def close(self):