Hello mate, it's been a while, hope you are well.Hello m8, nice to see you back!
Concerning your ELM327, most likely, it isn't compatible with the app because the version of the ELM isn't supported, especially if its a few years old. I had the same problem when I tried to use the app. If you download the app in the following link, it should tell you what version your current ELM327 is:
Still getting issues with this Saab, I solve one and another pops up. It's parked up more than its driven. I even debated if you break it and sell off the multitude of new parts fitted.
I'll do the app for the elm over the next few days but I have three hectic work days. Hopefully I can get to the bottom of the current issue.