int32_t demo_mqtt_start(void *mqtt_handle, char *product_key, char *device_name, char *device_secret, char *host, uint16_t port)在哪儿被调用

int32_t demo_mqtt_start(void *mqtt_handle, char *product_key, char *device_name, char *device_secret, char *host, uint16_t port)函数在提供的引用内容中没有被调用。因此，无法确定它在哪里被调用。
#### 引用[.reference_title]
- *1* *2* *3* [STM32F107 LWIP 接入阿里云MQTT](https://blog.csdn.net/u011570148/article/details/123541529)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^control_2,239^v3^insert_chatgpt"}} ] [.reference_item]
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