Creating an Mqtt client instance requires several parameters including a unique client ID, a broker IP address and port, and the optional MqttProperties object described previously.
DB9M-to-USB cable (optional if your host platform has an RS-232 port).
DB9M - to - US b线缆(如果主机平台有RS - 232端口,它就是可选的)。
3
The firm plans to offer optional solar-photoelectric systems, to be set up as a car port at home, that will be able to power the cars for 80km a day without having to draw on the grid.