In https://news.ycombinator.com/item?id=38531759 its OP states "A team member has published an open source Python iMessage protocol PoC on Github: https://github.com/JJTech0130/pypush."

Maybe there’s an easy way to just read all their replies but I see now that in the linked blog post it links https://blog.beeper.com/p/how-beeper-mini-works which goes over the technical details and mentions the python repo. Thanks

Oh, it wasn't lost among all their replies, it was in the 4th paragraph of the header text section of that Show HN post.

Beeper Mini's implementation was built on top of this repo. I'm sure it was cleaned up and modified for the production release, but the gist is largely still the same.

Thanks I see that mentioned here https://blog.beeper.com/p/how-beeper-mini-works