How are devices installed, connected, configured?

It must be possible to flash firmware in-situ. Devices will likely be installed in IP rated boxes up masts and on roofs where access may be difficult. WiFi may be acceptable but wired probably better, for reliability, and to avoid requiring the installation of a WiFi access point on a roof also.

Meshtastic does not provide OTA (wifi) flashing for ESP32 devices because of code space requirement. It could be done over serial (RS422), with a reset line maybe, or with another ESP as programmer.

https://www.improv-wifi.com/