add a long variable timeout to catch brokers like io forcefully disconnecting a client

Author: brentru

adafruit_minimqtt.py

@@ -537,7 +537,7 @@ def wait_for_msg(self):
         """Reads and processes network events.
         Returns response code if successful.
         """
-        self._sock.settimeout(0.0)
+        self._sock.settimeout(30.0)
         res = self._sock.read(1)
         if res in [None, b""]:
             return None