Header-only C/C++ Meshtastic LoRa protocol stack for embedded systems

As I already quoted here: https://news.ycombinator.com/item?id=49060894 from the OT:

> [meshtastic-lite is] Designed for embedded systems that want to interoperate with the Meshtastic network without pulling in the full Meshtastic firmware, Arduino, RadioLib, Nanopb, or FreeRTOS dependencies.

What other OS and RTOS could be supported?

What would it take to get OpenWRT support for meshtastic LoRa?

The meshtastic-adv keyboard shortcuts look more usable e.g. on a (M5Stack Cardputer ADV) with LoRA or just BLE; https://github.com/anton-vinogradov/meshtastic-adv#how-to-dr...