Various implementations of Loxone Link and Loxone Tree Bus on a STM32F103VET6, which can be bought with a CAN bus, RS232 and RS485 for a bit more something between 10-25 Euro at e.g. Aliexpress. The prices seem to vary a lot, it is worth to shop around for any STM32F103 with a CAN bus.
Project for the CrossWorks for ARM 4.4 from Rowley Associates.
Examples for:
- DMX Extension
- Modbus Extension
- Relay Extension
- RS232 Extension
- DI Extension
- Tree Extension with support for multiple tree devices:
- Tree Alarm Siren
- Tree RGBW Dimmer
- Tree Room Comfort
- Tree Touch
Multiple extensions and even tree devices behind multiple Tree extensions are possible.
Please read the protocol documentation at https://github.com/sarnau/Inside-The-Loxone-Miniserver for more details.