This build a container for Silicon Lab's cpc-daemon.

CPCd allows for multiprotocol communication on top of a single processor. One can for example run Thread and BLE at the same time. Refer to the guide for more details.

This container on it's own does not do much. You want to set this up, then run something like a OpenThread Border Router on top of it.

CPCd is configured with cpcd.conf. The deafult for the container is included in the repo. To override a configuration, you can set the corresponding ENV variable. The format is CPCD_SOME_OPT=abc will translate to some_option: abc in the configuration. For example, setting CPCD_UART_DEVICE_BAUD=460800 results in an override of uart_device_baud: 460800 in the final cpcd.conf.

CPCd does encrypted communication, so you'll need to generate a binding key the first time. Refer to this guide. You can run this from cpcd within the container itself:

podman run --name=cpcd-setup -it --device=/dev/ttyACM0 -v /dev/shm:/dev/shm:rw --userns=keep-id -e CPCD_UART_DEVICE_BAUD=460800 --group-add=keep-groups ghcr.io/yichenshen/cpcd-container:latest /bin/bash
> cpcd -c cpcd.conf --bind ecdh
> cat /run/secrets/cpcd_key

Be sure to save this key in a secure place. If you delete it along with the setup container you might lock yourself out of the hardware. Then put this in a file and load it into podman as a secret as cpcd_key. This is the default secret name used by the conf and quadlet file provided.

echo "<key>" > binding.key
cat binding.key | podman secret create cpcd_key -

The container can be run as a rootless podman container using quadlet.

cp cpcd.container ~/.config/containers/systemd/
systemctl --user daemon-reload
systemctl --user start cpcd

If there are errors, check the configuration, especially the baud rate is correct.

See the LICENSE file for license rights and limitations (MIT).