How to send data from end device to coordinator without using the periodic reporting

[Arsanios]

Hi,

I want to know if is it possible to send data from the end device to a coordinator without using the periodic reporting method which makes the end device sending the attribute value every x time?

I will explain my application concept to clarify my point:

Think about a sensor (end device) that measures the temperature periodically, and should send the temperature's values to the coordinator only if the value has exceeded certain limit, so I don't want to send the temp periodically but only if the limit value or higher has been detected.

Consider also that the sensor is a battery application, so I have to di that to minimize the power consumption.

Thanks in advance

Arsanios

[Edvin]

Hello,

Yes. This should be possilbe. If you look at the multi_sensor example from the SDK\examples\zigbee\experimental\multi_sensor, this is an example containing a (simulated) temperature sensor and a (simulated) pressure sensor.

The function found in main.c:

static void zb_app_timer_handler(void * context)
{
    zb_zcl_status_t zcl_status;
    static zb_int16_t new_temp_value, new_pres_value;

    /* Get new temperature measured value */
    new_temp_value = (zb_int16_t)sensorsim_measure(&m_temperature_sim_state, &m_temperature_sim_cfg);
    zcl_status = zb_zcl_set_attr_val(MULTI_SENSOR_ENDPOINT, 
                                     ZB_ZCL_CLUSTER_ID_TEMP_MEASUREMENT, 
                                     ZB_ZCL_CLUSTER_SERVER_ROLE, 
                                     ZB_ZCL_ATTR_TEMP_MEASUREMENT_VALUE_ID, 
                                     (zb_uint8_t *)&new_temp_value, 
                                     ZB_FALSE);
    if(zcl_status != ZB_ZCL_STATUS_SUCCESS)
    {
        NRF_LOG_INFO("Set temperature value fail. zcl_status: %d", zcl_status);
    }

    /* Get new pressure measured value */
    new_pres_value = (zb_int16_t)sensorsim_measure(&m_pressure_sim_state, &m_pressure_sim_cfg);
    zcl_status = zb_zcl_set_attr_val(MULTI_SENSOR_ENDPOINT,
                                     ZB_ZCL_CLUSTER_ID_PRESSURE_MEASUREMENT, 
                                     ZB_ZCL_CLUSTER_SERVER_ROLE, 
                                     ZB_ZCL_ATTR_PRES_MEASUREMENT_VALUE_ID, 
                                     (zb_uint8_t *)&new_pres_value, 
                                     ZB_FALSE);
    if(zcl_status != ZB_ZCL_STATUS_SUCCESS)
    {
        NRF_LOG_INFO("Set pressure value fail. zcl_status: %d", zcl_status);
    }
}

Will set the values for the two sensor on a timer interrupt. Let us look at only the temperature:

new_temp_value = (zb_int16_t)sensorsim_measure(&m_temperature_sim_state, &m_temperature_sim_cfg);

Will simulate a temperature value, while

    zcl_status = zb_zcl_set_attr_val(MULTI_SENSOR_ENDPOINT, 
                                     ZB_ZCL_CLUSTER_ID_TEMP_MEASUREMENT, 
                                     ZB_ZCL_CLUSTER_SERVER_ROLE, 
                                     ZB_ZCL_ATTR_TEMP_MEASUREMENT_VALUE_ID, 
                                     (zb_uint8_t *)&new_temp_value, 
                                     ZB_FALSE);
    if(zcl_status != ZB_ZCL_STATUS_SUCCESS)
    {
        NRF_LOG_INFO("Set temperature value fail. zcl_status: %d", zcl_status);
    }

Will uptade the attribute (and print the error if it failed to update the value). 

So if you just call zb_zcl_set_attr_val() only if it fulfills your limit requirements it will only update the value when the limit is reached.

BR,

Edvin