// Create a sensor listener that will call function `aggregate_sensor_data` after polling the sensor data
    let listener = sensor::new_sensor_listener(
        &TEMP_SENSOR_KEY,   //  Transmit as field: `t`
        TEMP_SENSOR_TYPE,   //  Type of sensor data: Raw temperature (integer from 0 to 4095)
        app_network::aggregate_sensor_data  //  Call this function with the polled data: `aggregate_sensor_data`
    ) ? ;