I think it means ST-Link-compatible programmer, a device used to flash/debug ST chips. You can see a big STM32 MCU on one of the FCC ID photos. The protocol ca

I think it means ST-Link-compatible programmer, a device used to flash/debug ST chips. You can see a big STM32 MCU on one of the FCC ID photos. The protocol can be bitbanged over GPIO, so for example if you own a Raspberry Pi (or anything similar), all you need to do is to install openocd.