Since we really need some other data radio options in the hobby, I
wanted to mention LoRa.
It's a chirped spread spectrum technology used for low power WAN
applications, with air transfer rates: 300bps-31.2Kbps. There are 433
MHz modules, as well as 900 MHz and 2.4 GHz.
As a staring place, WA2KWR has some code here:
https://github.com/fcolumbu/LoRa_Projects/wiki
Steve, KB9MWR