when using the 3D probe like WP500 , the user need to send Clamp-UnClamp command to the CNC macine in order to catch the probe. But if the controll PC is far from the machine it is difficult to hold the probe and insert it manualy to the router, and send the command to clamp the probe. I use small device M5Stack core, that attach to the machine , and it connect to the CNC by the wifi network and carvera tcp protocol for MDI commands. by using the 3 M5stack buttons i can send commands directly to the CNC.