How do you send a message to a specific client?

[dj-foxxy]

uWS is running it's own thread. What's the normal way to send a message to a specific client from outside uWS? My initial thought was a map from internal ID to socket pointer but the docs say that a map shouldn't be required. My current work around is to have each socket subscribe to it's internal ID as the topic, but this doesn't seem right.