I think it’s odd there’s no possibility to manually enter an IP address.
To check correct inter-VLAN fw rules: see if Homey can reach the Shelly by adding a Net Scan “TCP Port” device.
App:
https://community.homey.app/t/app-pro-netscan-track-devices-on-your-local-network-using-arp-and-tcp-checks/47454?u=peter_kawa
