Interface for Junkers/Bosch Gastherme with Heatronic 2
The BM1 CAN module is required with a TA250/TA270 controller
All data from the CAN bus is published to a local MQTT broker

See also:
https://wiki.volkszaehler.org/hardware/channels/heating_control/gastherme_junkers_can_bus

/boot/config.txt:
dtparam=spi=on
dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25
dtoverlay=spi-bcm2835-overlay

apt-get install can-utils

ip link set can0 up type can bitrate 10000 listen-only on

ifconfig can0

candump can0

Thanks to:
https://github.com/craigpeacock/CAN-Examples
https://github.com/Johannes4Linux/libmosquitto_examples