[ESP32-S2-Kaluga-1 Review] MQTT component connection to OneNet

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[ESP32-S2-Kaluga-1 Review] MQTT component connection to OneNet [Copy link]

Connect to OneNet Cloud via MQTT. I don't see any MQTT examples in the examples, which is a bit strange. However, there are some in the examples directory of IDF SDK, and you can see the MQTT configuration in the default configuration options of the project. So you can add the corresponding library and use it directly. Just copy the code of the example and replace the httpss_request example in the previous section. 1. The use of MQTT is not complicated, which can be seen from the code structure of the example - 1.1. First, initialize and start the necessary peripherals in the main function, and then initialize MQTT 
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 - 1.2. The initialization of MQTT mainly involves an important structure `esp_mqtt_client_config_t`, and a key message callback function `esp_mqtt_client_register_event`. After setting and implementing these points, you can use MQTT smoothly 
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 - 1.3. The message callback function will return various types of message events, such as connection status, push message feedback, subscription message notification, etc. Users can implement corresponding processing according to their needs [attach] 498922 [/attach] ## Modify the routine to adapt to the ONENET cloud 1. Open the configuration interface and modify the account and password of WiFI in the routine configuration. Note that some mqtt servers do not support the websocket method. Remember to deselect it. If the encryption item is not used, you also need to deselect it. 1. Modify the server address and port to be connected. Client_id, username, and password are all based on the product you have established on the ONENET platform. For details, please refer to the official documentation of onenet [attach] 498921 [/attach] 1. Modify the callback function for processing information. The routine is in the connection success message, subscribing and publishing messages. Our test is to simply modify it here to adapt to the needs of the onenet platform [attach] 498923 [/attach] 1. Compile and run, the output is as follows, you can see that the server has been connected successfully and received the subscribed topic The error is because the information that the platform needs to send needs to be in json format, and the information I send here does not conform to the format 
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 1. The above is the use of mqtt