Disconnect if no ping response, but if downloading ping again, resetting _ping_t

Author: JamesParrott

src/paho/mqtt/client.py

@@ -2153,7 +2153,7 @@ def loop_misc(self) -> MQTTErrorCode:
         now = time_func()
         self._check_keepalive()
 
-        if self._ping_t > 0 and now - self._last_msg_in >= self._keepalive:
+        if self._ping_t > 0 and now - self._ping_t >= self._keepalive:
             # client->ping_t != 0 means we are waiting for a pingresp.
             # This hasn't happened in the keepalive time so we should disconnect.
             self._sock_close()