Depends how open you mean. For a lot of hobbyists and integrators, this works: https://github.com/hologram-io/nova-hardware https://github.com/hologram-io/nova

Depends how open you mean. For a lot of hobbyists and integrators, this works: https://github.com/hologram-io/nova-hardware https://github.com/hologram-io/nova-hardware And run this on a Pi: https://github.com/hologram-io/hologram-python https://github.com/hologram-io/hologram-python If you need something one layer deeper on the module or chipset level, there’s not really a lot out there.