Remote logging with syslogd

I have a router which runs Busybox (v1.31.1) and provides the syslogd daemon.

It enables me to log to https://www.papertrail.com using a call like so:

    syslogd -R logs.papertrailapp.com:x538x -L -s 50 -b 7

Instead of papertrail, I would like it to log to Observium instead.

Reading the documentation: https://docs.observium.org/syslog/

It's unclear to me how I should set it up on the Observium server such that I can just point the router to a hostname/ip and port number and get it to log to Observium.

Any help is greatly appreciated. Thanks