This repo contains Buildroot for the SolarCamPi
Check https://github.com/Manawyrm/SolarCamPi-Buildroot/tree/main/buildroot/board/raspberrypi0w/skeleton/solarcampi for the interesting bits
After flashing the latest release, mount the FAT32 partition and change the solarcampi.ini accordingly.
Ensure a file called "id_rsa" (SSH RSA private key for the ssh tunnel) exists.
Ensure a file called "authorized_keys" (list of public keys) exists.
Tested with Buildroot 2021.08