When I type the URL into a browser it works BUT when I call the RESTful Command: wiim_pro_bluetooth in developer/services it doesnt work. Seems pretty simple and straightforward but obviously I am missing something?
Are you trying to say that even with logging at maximum, the calling of the service from Developer Tools never produces anything in the log file? Hard to credit really.
Looking at the docs you may need to split the url and the payload.
If I call the same URL in a browser they both work and come back with a response of “OK.”
If I use the curl command in the HA CLI - they both also work correctly