Thanks for giving it a shot. I don't have the Carly adapter (might buy one to test with) but as of now it doesn't sound like it's compatible. Usually it will say "Something went wrong" but there's a few cases I haven't totally caught. If you double tap "reading" it should reset, but I would expect the same behavior the next time you try to connect :-/

Every generic bluetooth ELM 327 adapter I've tried has worked fine, but other adapters have not including the OBD Link series of adapters which are advertised as being ELM 327 compatible. On that front, I have a workaround coded in that works with the latest firmware, but I believe older versions still don't work (Carly may be based on their chip and fall into this category). I've also been working with them to reproduce the problem and a fix should be included in their firmware sometime in the future although they report they don't currently have a timetable on release due to COVID-19.