I have now updated my mcGateways and that update went well, no problem during update.
I started mcStudio and started to connect to mcModules to restart them so that I could upgrade firmware on the mcModules. It worked just perfect connecting to two mcModules and everything worked as it should during the firmware update. But on my third device I could not connect to it, I tried many times and also other mcModules but I was not able to connect. I also tried to go back and connect to a mcModule that I had updated but that was not possible.
I restarted the mcGateway and now i could connect to mcModules again. After two successful connection then I had several attempts that failed I did try a couple of times more and then i could connect again.
I have now managed to update all my mcModules, but still no update over MQTT from my devices in my refrigerator and freezer that we all now have been in there for a while and we know that it should work.
I also noticed that a device that had older firmware, when updated it cant reach the mcGateway anymore from the exact same place, so it seems that some modification was made on the Lplan connection? I think it was the .365 update I noticed a drop on other device in Rssi when updated last time.
I will try to upload new code to the devices because a reboot does not fix the MQTT issue, I will let you know how that goes.