Merge pull request #8911 from c1728p9/esp8266_flow_control_fix

Fix ESP8266 recv_udp timeout with flow control

components/wifi/esp8266-driver/ESP8266/ESP8266.cpp

@@ -763,10 +763,9 @@ int32_t ESP8266::recv_udp(int id, void *data, uint32_t amount, uint32_t timeout)
     _smutex.lock();
     set_timeout(timeout);
 
-    // No flow control, drain the USART receive register ASAP to avoid data overrun
-    if (_serial_rts == NC) {
-        _process_oob(timeout, true);
-    }
+    // Process OOB data since this is
+    // how UDP packets are received
+    _process_oob(timeout, true);
 
     set_timeout();