OpenTherm Gateway failed to connect

[grzeg22]

The problem

I have an opentherm gate made according to the design from the Schelte Bron website (http://otgw.tclcode.com). I have it connected via USB to my openwrt router. On the router, I use the socat command to send a transmission from USB to the TCP port. I have Home Assistant connected via socket://IP:port to the openwrt router. Up to version core_2024.5.0 everything worked. After updating to version core_2024.5.1 (where opentherm_gw was updated to 2.2.0), my opentherm system stopped working - there was no connection to the openwrt router with socat running. I did an analysis - after updating the opentherm_gw version to 2.2.0, the integration connects to two TCP ports in parallel, which is not possible in the case of socat. Therefore, a connection error occurs. This was confirmed by the use of the Remote Access option in the otmonitor software from the Schelte website, which can be used as a relay - there is a parallel connection on two TCP ports. Network analysis using Wireshark showed this similarly - Home Assistant connects to the socat service in parallel on two TCP ports. Is there any setting in Home Assistant that forces connection to only one TCP port? Unfortunately, subsequent Home Assistant updates did not fix the error that occurred to me. Best regards Grzegorz Kalus

What version of Home Assistant Core has the issue?

core-2024.5.1

What was the last working version of Home Assistant Core?

core-2024.5.0

What type of installation are you running?

Home Assistant OS

Integration causing the issue

OpenTherm Gateway

Link to integration documentation on our website

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

Diagnostics information

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

No response

Additional information

No response

[home-assistant[bot]]

Hey there @mvn23, mind taking a look at this issue as it has been labeled with an integration (opentherm_gw) you are listed as a code owner for? Thanks!

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[mvn23]

Thank you for the report, possibly related to #117599 Do you get any errors in your Home Assistant log?

[grzeg22]

Yes I have an error in Home Assistant Core: 2024-05-31 21:46:05.503 ERROR (MainThread) [pyotgw.connection] The serial device on socket://172.16.255.252:23000 is not responding. Will keep trying.

[mvn23]

This has to be fixed in pyserial-asyncio-fast, the issue is mentioned just above this post.

[umtauscher]

Hi, I don‘t understand what you are telling us here. This problem is long standing. Will it ever be fixed?

[mvn23]

I guess we have different definitions of "long standing", but that's not really relevant at the moment.

The issue is not caused by a bug in Home Assistant or the OpenTherm Gateway integration. Neither is it a bug in the pyotgw library that is used in the integration. It is caused by a small difference between pyserial-asyncio, which pyotgw used in the past for the underlying serial connection but which had other issues, and pyserial-asyncio-fast which fixed those other issues.

The issue has been reported here: home-assistant-libs/pyserial-asyncio-fast#12 I created a PR for a fix here: home-assistant-libs/pyserial-asyncio-fast#13

However, because of the dependencies between the different projects, the people over at pyserial-asyncio-fast have to apply the fix and release a new version first. Once that is done we can start working on getting the new version in Home Assistant.

[umtauscher]

Hi mvn23, thanks you very much for your response. I did‘t want to criticize in any way. For me is a not functioning integration for nearly two months naturally a long time. You know „a watched pot never boils“ ;-)

So I will be waiting patiently. Cheers

[umtauscher]

Followup: I my case the problem is solved, because it seems to have had another cause. My otgw interface showed operating mode "unknown". I was not able to switch it into gatewaymode by software. After a powercycle of the otgw interface everything went back to working. ... just to let you know... Cheers