Years ago i discovered the RF-protocol of the Davis Vantage Vue ISS Weather station (see Davis Vue Hacking – Part 1 and Davis Vue Hacking – Part 2)
I used an Moteino to receive and decode the data. But the moteino lacks of IP-Support and i used a Gateway to bridge the serial output from the Moteino to MQTT.
Now i wanted to get rid of this setup and have an All-In-One sollution. Therfore i used a RFM69 Board and an ESP32 and wired both together with seven wires, added some programming and now ist is up and running since some weeks.
You'll find the source-code and some documentation on in the github repository. https://github.com/dcbo/ISS-MQTT-Gateway
You'll need only an ESP32 and an RFM69 Board.
The Wiring is documented in the Repository.
It all fits in small Box.