HomesteadGateway

Gateway between multiple HomesteadRelay's and the HomesteadToGo Bot.

dev notes

perhaps drop database, instead

Mod     -> websocket /register { server_id, channel_id }                   // grabbed from mod config
Bot     -> websocket /ready { channel_id }                                 // ready if Mod with fitting channel_id has called /register
Gateway -> memory cache (server_id -> channel_id; channel_id -> server_id) // mem enough
Mod/Bot -> websocket /ws { ... } -> Bot/Mod                                // sync