I am able to test TURN as well as TURNS and while doing testing these, I can see turn and turns logs in coturn log file.
However when doing testing of STUN, its logs are not coming in turn server in coturn log file, Although I am able to test call using STUN and getting slrfx as well in Trickle ICE tool.
coturn github url - https://github.com/coturn/coturn