iTach WF2CC

Three isolated dry-contact relays with transient voltage suppression, 24V AC/DC at 0.5 A, normally open, on a pluggable screw terminal. They close a contact for equipment that expects one and cannot switch a mains load. The radio is 802.11b/g, so it needs a 2.4 GHz SSID and a DHCP reservation, since the gc100 integration is configured by IP address. Home Assistant maps each relay through the gc100 `switch` platform as `'x:y': name`; that integration is documented against the GC-100 adapters and works here because the iTach speaks the same Global Caché TCP API on port 4998, answering `setstate` on module 1, ports 1 to 3. The contacts are maintained rather than momentary: `setstate` holds a relay in its new state until it is set back, and a timed pulse comes from the API's optional period parameter or from an automation that releases the relay. Think twice before putting a gate or fireplace on Wi-Fi at all. Control runs over TCP, so a lost packet is retransmitted rather than dropped, but a stalled or reset socket surfaces as a delay or an integration error at the moment someone is standing at the gate.