The Gerbers and BOM have been sent to production : the V4 is now in production.
This revision marks, I hope, the closure of the hardware development phase and the beginning of firmware optimization.

Next phase: 

• bring-up of the V4 in few weeks 

• firmware (il everything is OK) : Focus will shift to thefinite-state control, FRAM ring buffer, and the orchestration of wake/sleep cycles with deterministic timing and energy budgets.

Many thanks again to PCBWay for their continuous support in this next iteration.