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