I guess it is not developed anymore and there are compatibility issues:
I just tried it and it would not connect to my hAP ac^2 running ROS 6.41.3 / 6.42. Right after "running" it says "disconnected". I can do btest from other ROS devices without issue and I am sure that auth is correct because with different password it says "auth. failed" .
(btw: the "help" button leads to ROS 2.8 website.. thats just prehistoric stuff. No wonder it does not work anymore)