For those who like or willing to play with their own radio, I share a project that I’m working on in my spare time. It’s a port of the SiK radio firmware to a Teensy 3.1 controller.
It supports RFM23 (100mW) and RFM23BP (1W) modules at 433 and 868Mhz. Also have a preliminary support for a secondary serial channel and a SBUS control channel.
For future I’m plan to add SX1280 support for higher speed 2.4Ghz links.
Please note this is not a product, but rather a proof of concept, so you have to build your own HW and compile the firmware.