As an aside, the TimeHAT V2 I used in the post was designed by some of the Meta timing lab team.

They've also designed Switchberry, a 7-port PTP boundary/transparent managed 1 Gbps switch which is run through a Raspberry Pi CM4. I'm currently testing it (along with some other switches).

The Switchberry is open hardware, too! https://github.com/Time-Appliances-Project/Incubation-Projec...