That app was the first and last, which was working on iPhone. I was able to configure the buttons after the initial connection to the broker. (I sent back a specific message after the app started on the phone... (described in this page documentation..) So that was fantastic! I dont have to go trough on every phone to set up a new feture, simply wait for another new start of the program.!
But, unfortunately, I upgraded the broker, and the app does not work anymore with WSS. It works with TCP, but this type of communication is only available on Android.
So this upgrade was the "bad choice", as I guess...
My certs are letsencrypt, it was working very well with the older version of the broker. I was trying with TLSv1, TLSv1.1, TLSv1.2... no success.
Is there any chance to get an app update?
(Mosquitto broker, 2.0.9, libwebsocket-dev 2.4)