I am currently trying to integrate the Threema Broadcast API into LibreNMS for alerting our employees via the Threema Work Messenger. I am new to PHP and have no further knowledge of the Backend from LibreNMS .
Currently my problem is that I can`t find any logfile on my LibreNMS Server that contains debug information which help me developing the new Transport Type. Within the WebUI I only receive an generic error while testing my code “Test to Threema failed - General Error”. I am using the preinstalled Ubuntu 18.04 VM and tried to tail the logfiles I found on the system but no luck. Can someone point me to the correct logfiles and give me some hints how to debug LibreNMS/ PHP?