WeeWX-MQTTReplicate can be run in ‘standalone’ mode. This mode still requires from of the WeeWX infrastructure/code. A sample invocation would look like python3 USER_ROOT/run_mqttreplicate.py ARGS. Where USER_ROOT is the location that extensions are installed into. This location varies by the method used to install WeeWX. And ARGS are the arguments to pass to WeeWX-MQTTPublish