System Messages
When initially connecting to the websocket, a system message with the topic system is sent automatically, confirming the connection with the corresponding username. While the websocket remains connected, a heartbeat system message is sent every 10 seconds containing the current Unix timestamp in millisecond format.
Response
Properties
topic
Returns the topic of the message. Returns "system".
success
Returns the username of the authenticated user that established the websocket connection. Returned in the initial connection message only.

