wget https://github.com/clickme83/check_shellys/blob/main/check_shellys
chmod +x /usr/lib/check_mk_agent/local/check_shellys
Enter IP Address(es) of your Shelly(s) on line 4
eg.: shellys=("192.168.173.10" "192.168.173.11" "192.168.173.12" )
Do a full service discovery on Host in your Check_MK Webinterface