In pre-load Dragino firmware, the UART port is used by the IoTd daemon (or pachubed in old version). You need to kill this daemon before testing your customized code, otherwise the test will fail. | In pre-load Dragino firmware, the UART port is used by the IoTd daemon (or pachubed in old version). You need to kill this daemon before testing your customized code, otherwise the test will fail. |