add server field to signal struct

models/host.go

@@ -136,6 +136,7 @@ type HostTurnRegister struct {
 
 // Signal - struct for signalling peer
 type Signal struct {
+	Server            string `json:"server"`
 	FromHostPubKey    string `json:"from_host_pubkey"`
 	TurnRelayEndpoint string `json:"turn_relay_addr"`
 	ToHostPubKey      string `json:"to_host_pubkey"`