core Onvis SMS2 lost connection / Can't pair again

The problem

Hi,

my ONVIS SMS2 motion sensors recently (randomly) lost connection. They're initially HomeKit devices which I've added to HomeKit, removing them, then adding them to HA after being discovered instantly.

I've updated both sensors yesterday after some troubleshooting, unfortunately with the same outcome.

Please find the stack trace attached.

What version of Home Assistant Core has the issue?

2025.9.4

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

homekit_controller

Link to integration documentation on our website

https://www.home-assistant.io/integrations/homekit_controller/

Diagnostics information

No response

Example YAML snippet

Anything in the logs that might be useful for us?

Logger: homeassistant.components.homekit_controller.config_flow Source: components/homekit_controller/config_flow.py:439  integration: HomeKit Device (documentation, issues)  First occurred: 9:08:24 AM (1 occurrence)  Last logged: 9:08:24 AM
Pairing attempt failed with an unhandled exception
Traceback (most recent call last):
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/coap/pairing.py", line 105, in _ensure_connected
    await self.connection_future
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/coap/connection.py", line 386, in connect
    await self.get_accessory_info()
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/coap/connection.py", line 395, in get_accessory_info
    _, body = await self.enc_ctx.post(OpCode.UNK_09_READ_GATT, 0x0000, b"")
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/coap/connection.py", line 181, in post
    res_pdu = await self.post_bytes(req_pdu)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/coap/connection.py", line 160, in post_bytes
    response = await self.coap_ctx.request(request).response
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/aiocoap/protocol.py", line 768, in _run_outer
    await cls._run(app_request, response, weak_observation, protocol, log)
  File "/usr/local/lib/python3.13/site-packages/aiocoap/protocol.py", line 843, in _run
    blockresponse = await blockrequest.response
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
aiocoap.error.LibraryShutdown

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/homekit_controller/config_flow.py", line 439, in async_step_pair
    return await self._entry_from_accessory(pairing)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/homekit_controller/config_flow.py", line 567, in _entry_from_accessory
    name = await pairing.get_primary_name()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/abstract.py", line 253, in get_primary_name
    accessories = await self.list_accessories_and_characteristics()
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/coap/pairing.py", line 140, in list_accessories_and_characteristics
    await self._ensure_connected()
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/coap/pairing.py", line 107, in _ensure_connected
    raise AccessoryDisconnectedError("failed to connect")
aiohomekit.exceptions.AccessoryDisconnectedError: failed to connectLogger: homeassistant.components.homekit_controller.config_flow Source: components/homekit_controller/config_flow.py:439  integration: HomeKit Device (documentation, issues)  First occurred: 9:08:24 AM (1 occurrence)  Last logged: 9:08:24 AM
Pairing attempt failed with an unhandled exception
Traceback (most recent call last):
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/coap/pairing.py", line 105, in _ensure_connected
    await self.connection_future
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/coap/connection.py", line 386, in connect
    await self.get_accessory_info()
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/coap/connection.py", line 395, in get_accessory_info
    _, body = await self.enc_ctx.post(OpCode.UNK_09_READ_GATT, 0x0000, b"")
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/coap/connection.py", line 181, in post
    res_pdu = await self.post_bytes(req_pdu)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/coap/connection.py", line 160, in post_bytes
    response = await self.coap_ctx.request(request).response
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/aiocoap/protocol.py", line 768, in _run_outer
    await cls._run(app_request, response, weak_observation, protocol, log)
  File "/usr/local/lib/python3.13/site-packages/aiocoap/protocol.py", line 843, in _run
    blockresponse = await blockrequest.response
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
aiocoap.error.LibraryShutdown

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/components/homekit_controller/config_flow.py", line 439, in async_step_pair
    return await self._entry_from_accessory(pairing)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/components/homekit_controller/config_flow.py", line 567, in _entry_from_accessory
    name = await pairing.get_primary_name()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/abstract.py", line 253, in get_primary_name
    accessories = await self.list_accessories_and_characteristics()
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/coap/pairing.py", line 140, in list_accessories_and_characteristics
    await self._ensure_connected()
  File "/usr/local/lib/python3.13/site-packages/aiohomekit/controller/coap/pairing.py", line 107, in _ensure_connected
    raise AccessoryDisconnectedError("failed to connect")
aiohomekit.exceptions.AccessoryDisconnectedError: failed to connect

Additional information

No response

Sep 20 '25 07:09 pbehrens99hh

Hey there @jc2k, @bdraco, mind taking a look at this issue as it has been labeled with an integration (homekit_controller) you are listed as a code owner for? Thanks!

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Sep 23 '25 20:09 home-assistant[bot]

There hasn't been any activity on this issue recently. Due to the high number of incoming GitHub notifications, we have to clean some of the old issues, as many of them have already been resolved with the latest updates. Please make sure to update to the latest Home Assistant version and check if that solves the issue. Let us know if that works for you by adding a comment 👍 This issue has now been marked as stale and will be closed if no further activity occurs. Thank you for your contributions.

Dec 22 '25 22:12 issue-triage-workflows[bot]