Slack RTM API

What it does

The legacy Real Time Messaging (RTM) API is a WebSocket-based API that allows you to receive events from Slack in real time and send messages as users, including bot users. It's sometimes referred to as the "RTM API". It was once the basis for all Slack clients and once commonly used with bot users to create helper bots for your workspace. We recommend having events pushed to you instead, using the HTTP-based Events API . Most of the RTM API's supported event types are also supported by the Events API . If you really like WebSockets, Socket Mode for apps delivers event subscriptions over WebSockets instead. Many workspace administrators will not allow apps and integrations using the RTM API…from docs.slack.dev

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