Just wanted to note: the entire configuration I'm building out is automated to run on any Debian/Ubuntu OS (not just a Pi), and my intent is to make NTP + PTP setup much more approachable for those who want to tinker with it.

The project is on GitHub: https://github.com/geerlingguy/time-pi

The blog post has more color/story around it, but the meat of it is over on GitHub, and right now I'm working my way through testing different network switches, installing an external GPS antenna, etc.

Also, if you're a PTP nerd, you might want to check out a project from the OCP-TAP, the Switchberry, an open hardware design for a PTP boundary/transparent clock with 7 ports! [1] This was built by the same PCB designers as the TimeHAT featured in my blog post, and I'm trying to hammer out some bugs in the bringup so they can be nice, lower-cost options for networks where you don't have the budget or need for enterprise-level PTP offerings, but still want a decent DIY setup.

[1] https://github.com/Time-Appliances-Project/Incubation-Projec...