属性配置之后，MQTT客户实例会从MQTT客户机工厂获得。

After properties configuration, an MQTT client instance is obtained from the MQTT client factory.

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在该例中，因为两个业务对象之间具有从属性，所以在访问相关的订单之前，有必要获得一个客户实例。

In the example, it is necessary to get a customer instance before accessing the associated orders because of the dependency between these two business objects.

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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。

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.

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