Zigbee electrical measurement cluster - sending data

[jwitowski]

Hello,
I'm trying to send some payload via ELECTRICAL_MEASUREMENT cluster.
The sending is realized in the similar way to the zigbee_light_switch example.

I'm sending data to the broadcast addr:

    zb_uint16_t addr = 0xFFFF;
    uint16_t measured_val = 0xABCD;

    NRF_LOG_INFO("Send el measurement command");

    ZB_CUSTOM_EL_MEASUREMENT_SEND_REQ(bufid,
                           addr,
                           ZB_APS_ADDR_MODE_16_ENDP_PRESENT,
                           HA_SMART_PLUG_ENDPOINT, //todo
                           HA_SMART_PLUG_ENDPOINT,
                           ZB_AF_HA_PROFILE_ID,
                           ZB_ZCL_DISABLE_DEFAULT_RESPONSE,
                           NULL,
                           measured_val);

Where the macro is:

#define ZB_CUSTOM_EL_MEASUREMENT_SEND_REQ(                                                                                                    \
    buffer, addr, dst_addr_mode, dst_ep, ep, prof_id, def_resp, cb, measured_val)                                                             \
{                                                                                                                                             \
  zb_uint8_t* ptr = ZB_ZCL_START_PACKET_REQ(buffer)                                                                                           \
  ZB_ZCL_CONSTRUCT_SPECIFIC_COMMAND_REQ_FRAME_CONTROL(ptr, def_resp)                                                                          \
  ZB_ZCL_CONSTRUCT_COMMAND_HEADER_REQ(ptr, ZB_ZCL_GET_SEQ_NUM(), ZB_ZCL_CMD_ELECTRICAL_MEASUREMENT_GET_MEASUREMENT_PROFILE_RESPONSE_COMMAND); \
  ZB_ZCL_PACKET_PUT_DATA16_VAL(ptr, (measured_val));                                                                                          \
  ZB_ZCL_FINISH_PACKET(buffer, ptr)                                                                                                           \
  ZB_ZCL_SEND_COMMAND_SHORT(                                                                                                                  \
      buffer, addr, dst_addr_mode, dst_ep, ep, prof_id, ZB_ZCL_CLUSTER_ID_ELECTRICAL_MEASUREMENT, cb);                                        \
}

After that I'm trying to find those data in the sniffer.

Cluster ID is correct, Cmd ID is also correct and the measured_val (0xABCD) is visible.

Unfortunatelly the packet seems to be malformed. Any idea what am I doing wrong and how to fix it ?

BR,
Jakub

[tomchy]

Hello Jakub,
Your packet is malformed, because it sends non-manufacturer specific command and the payload is not formatted according to the ZCL specification.

Please describe which command you would like to send, find it inside the ZCL specification and append all required fields to the packet.

The command "Get Measurement Profile Response" requires at least 5 fields and there is a macro to construct it correctly: ZB_ZCL_ELECTRICAL_MEASUREMENT_SEND_GET_MEASUREMENT_PROFILE_INFO_RESP.

BR,
Tomchy

[jwitowski]

Thank You, where can I find the ZB_ZCL_ELECTRICAL_MEASUREMENT_SEND_GET_MEASUREMENT_PROFILE_INFO_RESP macro ? It seems not to be available in the sdk files ?

[tomchy]

That might be a bit tricky - in the newest version of ZBOSS

github.com/.../zb_zcl_el_measurement.h

[jwitowski]

Thanks a lot. I am doing something wrong for sure . In the ZB_ZCL_ELECTRICAL_MEASUREMENT_SEND_GET_MEASUREMENT_PROFILE_INFO_RESP  there is no place for the measured value. So in my understanding I should do the following:

1. Update the measured value "internally" by calling the ZB_ZCL_SET_ATTRIBUTE.
2. Gateway should send me request with proper ID to get those measured data.
3. The ZB stack will send the response automatically in the background with updated (in I-st step) parameters.

Please correct me if I am wrong.

BR,
Jakub

[tomchy]

That's correct!
In Zigbee the sensor data is stored as an attribute value. The other device may:
- Query for the current value via the Read Attribute Request.
- Subscribe to the attribute value changes via binding & configuring the reporting.

There is a CLI example inside the SDK that is capable of doing both things.The sequence of commands, required to test the reporting can be found here:
https://infocenter.nordicsemi.com/topic/sdk_tz_v4.1.0/zigbee_multi_sensor_example.html?cp=7_3_3_8_5_3_1#zigbee_multi_sensor_example_test

The command that you were asking should be sent in response to the Get Measurement Profile Info command.

BR,
Tomchy