CM108 has a set of four GPIOs that can be used via hidraw. These can be read from or write to.
Raspberry Pi compatible, SA818 radio node
My new radio node that I designed last month is back from production at jlcpcb. Designed in Romania and built in China 😁. This is my first attempt using jlcpcb for the entire manufacturing chain, from PCB creation to part selection and assembly.