nostr:nevent1qqsw08snf2a0wp53ha5d4cev9qy87vmcsl2yxvza9syy4gmp5f9t37gppemhxue69uhkummn9ekx7mp0qgsxdp2cpe2m9ut65cuuj3v4pqldl6ej3ct44ae4s7a5ukhekquk2ycrqsqqqqqppt2ttq

We did some research before coding anything and the short answer is: for the use cases we are aiming, Bluetooth is the best option.

BLE was designed to be extremely efficient battery wise, and that's exactly what you need if you are out there on the streets for a prolonged time.