Bluepill does exactly that (and also lights up the LED). You should be able to find (old) discussion of the client elsewhere on this forum. I'm using version 0.1-14 (find it at https://gitlab.com/cy8aer/bluepill/p...pe=tags&page=1, download the armv7hl deployer, unzip it and install the RPM file).

This client isn't feature complete yet, so I fall back to Riot sometimes, but getting notifications on SFOS was a huge step forward. Development seems to be moving forwards, but slowly. I wish that I had the time to contribute myself.

cy8aer, if you're reading this, I really appreciate what you have done so far!

EDIT: I speed-read this thread too quickly, and missed cy8ear's post from yesterday! Sorry!