SoftRF

Multifunctional DIY IoT-based general aviation proximity awareness system.

Features:

2-way raw data bridge between 868/915 MHz radio band and Wi-Fi ;
standalone, battery powered, compatible proximity awareness instrument that fits typical 2.25 inches hole ;
lightweight version to carry onboard of an UAV.

Compatibility ¹

Type	Protocol	Skytraxx	SoftRF
Radio	FLARM AIR V6	²
	OGNTP		³
	P3I		³
	UAT 978 ADS-B		⁴
	FANET+		³
Data	FLARM NMEA
	Garmin GDL90
	MAVLINK
	Dump1090 ⁵

¹ - it is necessary for a reader to distinguish the difference between statement "compatible" and statement "fully compatible".
SoftRF implements only a reasonable minimum of the protocols specs. No "bells and whistles" so far.
² - FANET+ can not receive FLARM. However it is able to transmit it.
³ - valid for Prime Mark II , Dongle and Uni Editions; valid for Standalone and UAV Editions with optional DIY SoftRF LoRa RF module
⁴ - Reception of traffic 'downlink' frames only. Valid for Uni Edition alone and for Standalone Edition with optional DIY SoftRF UAT module
⁵ - also known as "raw ADS-B"

Models

Model	Platform	First appearance	Comment
1 Prime 2 Standalone 3 UAV 4 WebTop	Espressif ESP8266	Q4 2015	Prime model is no longer supported - use Prime MkII instead.
1 Prime Mark II 2 Standalone + adapter 3 UAV 4 SkyView EZ 5 Flight Recorder	Espressif ESP32	Q1 2018	Today's best platform
1 Raspberry Edition 2 SkyView Pi	Broadcom BCM283X (Raspberry Pi)	Q4 2018	Good for use together with RTL-SDR dongles to achieve additional 1090ES (and 978UAT) ADS-B air traffic reception.
1 UAT module 2 Uni	Texas Instruments CC1310 and CC1352	Q1 2019	Unique RF radio specs are useful for UAT reception [ 1 , 2 , 3 ].
1 Dongle 2 Retro	STMicroelectronics STM32	Q3 2019	AcSiP S76G "3-in-1" system-in-package is doing good [ 1 , 2 , 3 ] . As well as STM32F103C8 "Blue Pill" (same MCU that STM32 OGN tracker uses) [ 4 , 5 ] .
Mini	Cypress PSoC 4100S	Q3 2020	ASR6502 MCU + LoRa combo [ 1 ] .
Badge	Nordic Semiconductor nRF52840	Q4 2020