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1·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.

创建Mqtt客户实例需要几个参数，包括一个惟一客户机id、代理ip地址和端口以及可选的MqttProperties对象。

2·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.

公司计划提供光电转能系统，即未来的太阳能车房能实现电驱车不必从电网取电一天跑80公里了。

4·The gas burner may include an optional flame tube with an optional exhaust port in which a flame is contained and sequestered from diffusing air.

气体燃烧器可以包括可选的火焰管，该火焰管有可选的排出口，火焰包含于该火焰管中，并与扩散空气隔开。

5·The gas entry port may include an optional one-way valve.

气体输入口可包括可选的单向阀。

6·Pneumatic fluid power - Five-port directional control valves - Part 2 : mounting interface surfaces with optional electrical connector.

气压液动。五通方向控制阀。第2部分：任选电气连接器的安装接口面。

7·No module port provided (optional), able to use patch panel tubular dust cover, beautiful in matching.

不配备模块端口（可选择），可以使用配线架空口防尘盖板，配合美观；