rtm.connect method
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Usage info
This method begins a Real Time Messaging API session and reserves your application a specific URL with which to connect via websocket.
Unlike rtm.start, this method is focused only on connecting to the RTM API.
Use this method in conjunction with other Web API methods like conversations.list, users.list, and team.info to build a full picture of the team or workspace you're connecting on behalf of.
Please consult the RTM API documentation for full details on using the RTM API.
For most applications, Socket Mode is a better way to communicate with Slack anyway.
Response
This method returns a WebSocket Message Server URL and limited information about the team:
The url property contains a WebSocket Message Server URL. Connecting to this
URL will initiate a Real Time Messaging session. These URLs are only valid for
30 seconds, so connect quickly!
The self property contains a small amount of information concerning the connecting user — an id and their name.
The team attribute also houses brief information about the team, including its id, name, domain, and if it's part of an Enterprise Grid, the corresponding enterprise_id.