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espressif / esp-zigbee-sdk

Espressif Zigbee SDK
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How to know when a sleepy end device has disappeared from the network? (TZ-1039) #400

Closed Alfff closed 3 months ago

Alfff commented 4 months ago

Question

If I flash both HA_on_off_switch and HA_on_off_light examples, I can see these logs from the coordinator in the terminal if I turn off the end device after pairing and press the button in the coordinator:

I (32472) ESP_ZB_ON_OFF_SWITCH: Send 'on_off toggle' command
I (32492) ESP_ZB_ON_OFF_SWITCH: ZDO signal: NLME Status Indication (0x32), status: ESP_OK
I (35502) ESP_ZB_ON_OFF_SWITCH: ZDO signal: NLME Status Indication (0x32), status: ESP_OK
I (38512) ESP_ZB_ON_OFF_SWITCH: ZDO signal: NLME Status Indication (0x32), status: ESP_OK
I (41522) ESP_ZB_ON_OFF_SWITCH: ZDO signal: NLME Status Indication (0x32), status: ESP_OK
I (44512) ESP_ZB_ON_OFF_SWITCH: ZDO signal: ZDO Device Unavailable (0x3c), status: ESP_OK

I can see in Wireshark that each NLME Status Indication corresponds to an attempt to send the message without obtaining a response from the end device.

However, if I flash the light_sleep example, I can see that the coordinator only sends messages after it receives Data Request from the end device. Then, it is not possible to obtain a NLME Status Indication if the end device has disappeared.

I think that a workaround would be monitoring the reception of Data Request commands, but I don't know how to do this using the SDK.

Could you tell me if this is possible and how to do it?

Thank you in advance.

Additional context.

No response

xieqinan commented 3 months ago

@Alfff ,

However, if I flash the light_sleep example, I can see that the coordinator only sends messages after it receives Data Request from the end device. Then, it is not possible to obtain a NLME Status Indication if the end device has disappeared.

I believe that when you send a command to a missing sleeping end device, the NLME Status Indication signal will also be triggered, but the interval is 15 seconds. However, relying on this method to determine whether a sleeping device has disappeared is not ideal.

Instead, you can call esp_zb_nwk_get_next_neighbor() to iterate through the neighbor table to detect the status of the sleeping device. If the end device have not send the data_request to its parent, the router parent will remove it.

Alfff commented 3 months ago

Thanks @xieqinan