This is a port of NPR-70 modem to raspberry pi pico. See pi-pico/README.md Original README.md from Ed below:
This is the source code for the NPR-70 modem firmware by F4HDK.
This code is based on the 2020_02_23 release available at https://hackaday.io/project/164092-npr-new-packet-radio .
It adds a couple of features such as SNMP support (see the included MIB), as well as a refactor of settings (which makes it possible to update settings across firmware releases if needed) and reduced memory usage.
Ed