append

core/components/uart/uart.cpp

@@ -207,6 +207,7 @@ int Uart::receive(char *data, int size_max) {
       logger->debug("{} receive: {}[{}]", this->device.name, StringUtil().bytesToString((const uint8_t *)data, ret));
     }
   }
+  return ret;
 }
 int Uart::stop() {
   int rc = uartStop(&this->device);