Running the current master branch on the OcPoC causes the motors to arm at what sounds like greater than idle speed immediately upon launching px4. Followed Aerotenna docs at: https://aerotenna.readme.io/docs/px4-setup where they were still relevant.
No logs because the vehicle did not think it was armed, but screencap of terminal launching at: https://photos.app.goo.gl/18P1qmPGSS2q32KY7
Also odd that the HMC 5883 fails, I can verify that i2c-4 is the correct port and that it is working by running another autopilot.