Add support for the more efficient ElmüSoft Candlelight Protocol

Abierto

#2,102 abierto el 15/9/2026 0 comentarios 0 reacciones 0 asignados Ver en GitHub

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Evaluación

Dificultad: 5/5
Tiempo estimado: Más de una semana
Aptitud para principiantes: 30/100

Tipo de issue: Nueva funcionalidad
Claridad: Necesita aclaración
Estado de actividad: Activo
Stack tecnológico: python
Área: networking

Línea de trabajo

Comienza con la descripción detallada del proyecto enlazada y la demostración en Python del ElmüSoft Candlelight 2.5 firmware repository para comprender el protocolo y la funcionalidad requerida. Después, revisa el soporte existente de Candlelight en python-can y determina los puntos de entrada de integración. Se considera completado cuando python-can admita las funciones de transferencia USB y feedback del nuevo protocolo sin perder la compatibilidad heredada.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

enhancement

Hello

The legacy Candlelight protocol from Geschwister Schneider has not been designed very well.
It has several design errors.
The transfer over USB is far from optimal. For each CAN FD packet 80 bytes are transferred over USB no matter how many data bytes the CAN packet has.
There is no useful error feedback and there is no feedback if a Tx packet has been acknowledged on CAN bus.
The legacy Candlelight protocol only sends a FAKE echo back to the host computer, even if the Tx packet has never been sent to CAN bus.
You have a big problem to find out WHY CAN bus does not work without a useful feedback.

Therefore I designed the new ElmüSoft Candlelight 2.5 protocol with lots of improvements, lots of new features and the maximum USB transfer speed that is possible.

I wrote a Python demo application that contains ready-to-use classes that can be copied and pasted into any Python project. They could also be integrated into python-can.

The firmware runs on several CAN bus adapters with STM32G431, STM32G473 and STM32G0B1 processors.
The Python classes were tested on Windows where they use WinUSB and on Linux where they use libusb.

Here you find a detailed description of the entire project:
https://netcult.ch/elmue/CANable%20Firmware%20Update/

The sourcecode is on Github:
https://github.com/Elmue/CANable-2.5-firmware-Slcan-and-Candlelight

The Python demo shows all the functionality of the new firmware: