Small fixes

Handle more errors, and fix Client.stopListening

fbchat/_client.py

@@ -2834,10 +2834,13 @@ class Client(object):
 
     def stopListening(self):
         """Stop the listening loop."""
-        if not self._mqtt:
-            raise ValueError("Not listening")
-        self._mqtt.disconnect()
         self.listening = False
+        if not self._mqtt:
+            return
+        self._mqtt.disconnect()
+        # TODO: Preserve the _mqtt object
+        # Currently, there's some issues when disconnecting
+        self._mqtt = None
 
     def listen(self, markAlive=None):
         """Initialize and runs the listening loop continually.

fbchat/_mqtt.py

@@ -91,6 +91,12 @@ class Mqtt:
             if "lastIssuedSeqId" in j:
                 self._sequence_id = j["lastIssuedSeqId"]
 
+            if "errorCode" in j:
+                # Known types: ERROR_QUEUE_OVERFLOW | ERROR_QUEUE_NOT_FOUND
+                # 'F\xfa\x84\x8c\x85\xf8\xbc-\x88 FB_PAGES_INSUFFICIENT_PERMISSION\x00'
+                log.error("MQTT error code %s received", j["errorCode"])
+                # TODO: Consider resetting the sync_token and sequence ID here?
+
         log.debug("MQTT payload: %s", j)
 
         # Call the external callback