Connection to Keymatic get's lost when executing OH rules

[meyb]

Hello everyone,

I use openHAB to control my Homematic components. For quite some time I have the problem that the connection to the Keymatic (HM-Sec-Key) often (not always) aborts with a communication error during rule execution:

2020-11-06 20:15:00.479 [ome.event.ItemCommandEvent] - Item 'schloss_garage_status' received command OFF
2020-11-06 20:15:00.550 [nt.ItemStatePredictedEvent] - schloss_garage_status predicted to become OFF
2020-11-06 20:15:00.810 [vent.ItemStateChangedEvent] - schloss_garage_status changed from ON to OFF
==> /var/log/openhab2/openhab.log <==
2020-11-06 20:15:02.617 [WARN ] [ternal.handler.HomematicThingHandler] - Device 'xxx' is OFFLINE, can't send command 'OFF' for channel 'homematic:HM-Sec-Key:ccu:xxx:1#STATE'
==> /var/log/openhab2/events.log <==
2020-11-06 20:15:02.640 [hingStatusInfoChangedEvent] - 'homematic:HM-Sec-Key:ccu:xxx' changed from ONLINE to OFFLINE (COMMUNICATION_ERROR)

The status will be changed with the following rules:

rule "Garagentür schließen"
when
    Time cron "0 15 20 * * ? *"
then
    if (schloss_garage_status.state == ON || schloss_garage_status.state == NULL) {
        schloss_garage_status.sendCommand(OFF)
    }
end

rule "Garagentür öffnen"
when
    Time cron "0 0 7 * * ? *"
then
    if (schloss_garage_status.state == OFF) {
        schloss_garage_status.sendCommand(ON)
    }
end

In my opinion it is not the wireless connection, because I optimized it. By manually activating the Keymatic the connection to Homematic CCU will be re-established with SIGNALSTRENGTH=4.

I also realized in the OH log that the status changes more often than required:

2020-11-05 07:00:00.423 [ome.event.ItemCommandEvent] - Item 'schloss_garage_status' received command ON
2020-11-05 07:00:00.512 [nt.ItemStatePredictedEvent] - schloss_garage_status predicted to become ON
2020-11-05 07:00:00.771 [vent.ItemStateChangedEvent] - schloss_garage_status changed from OFF to ON
2020-11-05 07:00:01.996 [vent.ItemStateChangedEvent] - schloss_garage_status changed from ON to OFF
2020-11-05 07:00:06.114 [vent.ItemStateChangedEvent] - schloss_garage_status changed from OFF to ON

I assume that there is an issue with the binding. I created a program directly in the Homematic CCU which locks/unlocks the door and that works without any errors.

Is there a possibility to debug the binding-code or could anybody help me to fix this issue with the homematic-binding?

Thanks a lot for your support in advance!!!

[rossko57]

@meyb

I also realized in the OH log that the status changes more often than required:

That is not about the binding.
See “jitter and jumping” here -

Autoupdate - a primer

I’ve found myself having to investigate and/or explain some of the features of autoupdate over time, and thought an in-depth view would be helpful. These notes apply to openHAB version 2.5 Overview Autoupdate is primarily a “speed up” feature for openHAB Items. Mostly we can ignore it, but sometimes you may get an unwanted or unexpected effect, or you may wish to exercise more control. To fully understand autoupdate, we must understand the difference between command and state of Items. If w…

[meyb]

Thank you very much for this hint!!! That solved the issue and the Keymatic works now fine.