MQTT初始化
## MQTT初始化
函数原型|void MQTTClientInit(MQTTClient* client, Network* network, unsigned int command_timeout_ms,unsigned char* sendbuf, size_t sendbuf_size, unsigned char* readbuf, size_t readbuf_size);
|-|-|
功能 |MQTT初始化
形参说明 |client:MQTT客户端指针
||network:网络初始化指针
||command_timeout_ms：超时时间
||sendbuf：发送数组指针
||sendbuf_size：发送数组大小
||readbuf：读取数组指针
||readbuf_size：读取数组大小
返回值 |NA