RIL_MQTT_ERR_CONN_AT, // connect to MQTT broker error RIL_MQTT_ERR_CONN_FAIL, // connect to MQTT broker failed RIL_MQTT_ERR_SUB_AT, // subscribe to topic error RIL ...
Abstract: In response to the growing concern over air pollution in urban areas, this paper presents the design and validation of a mobile air quality monitoring system. The system integrates multiple ...
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