Send out pingreq, do not disconnect, if downloading, or pingreq overdue.

Author: JamesParrott

src/paho/mqtt/client.py

@@ -3279,7 +3279,7 @@ def _check_keepalive(self) -> None:
             last_msg_in = self._last_msg_in
 
         if self._sock is not None and (now - last_msg_out >= self._keepalive or now - last_msg_in >= self._keepalive):
-            if self._state == _ConnectionState.MQTT_CS_CONNECTED and self._ping_t == 0:
+            if self._state == _ConnectionState.MQTT_CS_CONNECTED:
                 try:
                     self._send_pingreq()
                 except Exception: