Should we get a kit?
Pledge €290 or more
We could add one of these chips to our platform, and stop worrying about BLE so much. SemTech are offering free samples.
Fixed sensors can realistically be powered forever with just small solar panel.
Notice that the lowest RX current is still 10mA. That MicroSemi chip could listen at 1.9mA, but the range was probably crap, and it was probably more sensitive to noise. The nRF52 listens at 5.5 mA peak current in RX and TX (0 dBm) (was 9.7 Rx/8 Tx)
It also has the advantage of 512 kB flash/64 kB RAM, and we get a BLE radio for free-ish.