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I am running Razberry on a Pi4 with the latest raspbian. After upgrading zwayserver from 3.1.3 to 3.1.4 the Apple Homekit Gate does not work anymore. The pin code changes every time I click save in the configuration or whenever I reboot the machine. Seems to be identical to the old issue discussed in this thread: https://forum.z-wave.me/viewtopic.php?t=25756

Indeed the PIN is generated on each save. You can get the PIN code from events log or from the app settings (just click Cancel instead of Save)

I can live with hitting cancel, but a pin code change on every reboot is a bit more challenging to relate to

Well, you need it only once Indeed, we will think if we can make it constant

Is there a way to fix it manually, after the initial pairing?
The situation now:
1. add integration to Home Assistant, discovers it nicely
2. reboot, etc. - HomeKit PIN changes, Home Assistant can no longer communicate nor discover RaZberry

There seems to be a process with an iOS device to unregister it and have it discoverable again. But w/out an iOS device the only option is to do uninstall and re-install the Apple HomeKit Gate.

Any other means less rigorous to have it discoverable again, other than preventing the change of the PIN?

Why Home Assistant is discovering RaZberry via HomeKit? The PIN is used only during pairing. Then it does not affect communications.