Based on the ST60A3H1 for the STM32 Nucleo development board, the X-NUCLEO-60K1A1 from STMicroelectronics contains two boards that work as a pair. The X-NUCLEO-60L1A1 expansion board hosts an ST60A3H1 configured as Local, while the X-NUCLEO-60R1A1 expansion board hosts an ST60A3H1 configured as Remote.
The Local board plugs into an STM32 Nucleo development board through Arduino UNO R3 connectors. The Remote board operates stand-alone, while configuration of the pair is handled from the Local side. Free development firmware, examples and the X-CUBE-ST60 software expansion package support development within STM32Cube.