Every step,
in the log.

First GPS fix from collar 01.

The board got a fix about five minutes after a cold start under open sky and settled to 2.2 m. Our own firmware now boots on it and loads a boundary. The buzzer isn't wired yet.

• All prototype parts delivered, laid out, and photographed.
• One board does the processor, LTE-M, and GPS. The only other module is a buzzer.
• First fix: 318 s from a cold start, 5.9 m at first, 2.2 m within about a minute.
• Decided to write our own firmware on the nRF Connect SDK.
• Geofence engine and cue policy in plain C, with host tests. All pass.
• First flash hit a BusFault from the wrong partition layout. Attempt two boots and loads a boundary.
• Collar protocol drafted: boundaries down, acknowledgements and positions up.

Components ordered for the first prototype.

Parts for collar 01 are on the way. Assembly happens in the garage, so there's no date for first power-on. This site was rebuilt over the following night.