aws_iot_mqtt_config component

Component for ESP-IDF. Provides functions to store and load MQTT config attributes to/from NVS storage.

Following attributes are managed:

• host
• port
• uri
• cert_pem, cert_len
• client_cert_pem, client_cert_len
• client_key_pem, client_key_len
• clientkey_password, clientkey_password_len

Usage

When used as IDF component, add it as a Git submodule

git submodule add https://github.com/mdvorak-iot/esp-aws-iot-mqtt-config.git components/aws_iot_mqtt_config

When used as platformio library, add it to platformio.ini:

[env]
lib_deps = https://github.com/mdvorak-iot/esp-aws-iot-mqtt-config.git

Code

See example.

Note that when attributes are loaded into config, they are newly allocated and should be freed when not needed.

esp_mqtt_client_init() method creates copy of some attributes, but does not copy certificates and key. Those must not be freed as long as mqtt client exists.

esp_mqtt_client_config_t mqtt_cfg = {};
mqtt_cfg.cert_pem = AWS_IOT_ROOT_CA;
mqtt_cfg.cert_len = AWS_IOT_ROOT_CA_LEN;
ESP_ERROR_CHECK(aws_iot_mqtt_config_load(&mqtt_cfg));

esp_mqtt_client_handle_t mqtt_client = esp_mqtt_client_init(&mqtt_cfg);
// ...

aws_iot_mqtt_config_free_unused(&mqtt_cfg);
ESP_ERROR_CHECK(esp_mqtt_client_start(mqtt_client));