Homebridge and all devices with no answer
Before today I had Homebridge 1.2.5 up and running almost fine for a long time, since Homebridge 1.1 ... had some troubles now and then with Ciao mDNS and was glad to see that Homebridge 1.3.x brings back Bonjour-HAP, so I decided to update.

Update went smooth, all was fine. I changed mDNS Advertiser to Bonjour HAP, restarted and nothing worked, all devices on my iPad and iPhone were offline with no answer. So I decided to roll back my change to Ciao mDNS again, restarted, and nothing worked too, for whatever reason.

Restarted iPad & iPhone, without success. Then I did a downgrade to 1.2.5, without success either. Then I did a complete restore of my previous backup of 1.2.5, guess what ... without any success. All devices are down with "no answer" or really "Keine Antwort" :-(

So I don't know what the problem is at all. Any hint? Any guess?

node v12.21.0
npm v6.14.11
homebridge v1.3.1 (HAP-NodeJS v0.9.2)
FHEM latest version + homebridge-fhem latest version
Raspbian Buster on a Raspberry Pi 4b 

thank you.