Rocket.Chat Notification Connector

Rocket.Chat is a teamchat tool similar to Slack.
Notifications could be posted through its REST API: https://docs.rocket.chat/developer-guides/rest-api/

Relevant calls:

• Connection Check: https://docs.rocket.chat/developer-guides/rest-api/miscellaneous/info
• Login: https://docs.rocket.chat/developer-guides/rest-api/authentication/login
• Logout: https://docs.rocket.chat/developer-guides/rest-api/authentication/logout
• Post Message: https://docs.rocket.chat/developer-guides/rest-api/chat/postmessage

There is a Java Client Library for the REST API: https://github.com/baloise/rocket-chat-rest-client. But i think i will use plain httpclient since the list of transitive dependencies looks to big. (different jackson version, unirest, org.json, httpclient)