I have a TRB255 which makes MQTT connections (via a Lua script) to a Mosquitto broker using SSL.
This was working, and for example I could subscribe using the folllowing commandline:
mosquitto_sub -h <host> -p <port> --cafile broker-cert.pem -t '#' -u <user> -P <pass> --insecure
That was until I did a firmware upgrade to 07.06.3, after which I started getting SSL issues (mosquitto_sub reports “Protocol error” and I get SSL errors in the Mosquitto logs).
I don’t know what firmware I started with, but I downgraded to 07.04.1 which does work. That has OpenSSL version 1.1.1.n, whereas 07.06.3 has 1.1.1t.
It is of-course possible that something else changed in the firmware upgrade but everything seems to suggest an SSL issue somewhere. (OpenSSL on the broker’s end is 3.0.2.15 if that helps.)
Any idea what is going on, or how to fix it?
(Edited to correct the version numbers which were wrong when first posted.)