The datarhei Core includes a simple RTMP server for publishing and playing streams. It is not enabled by default. You have to enable it in the config in the rtmp section or via the corresponding environemnt variables.
Example:
In the above example /live is the RTMP app and 12345.stream is the name of the resource.
In order to protect access to the RTMP server you should define a token in the configuration. Only with a valid token it is possible to publish or play resources. The token has to be appended to the RTMP URL as a query string, e.g. rtmp://127.0.0.1:1935/live/12345.stream?token=abc.
As of version 16.12.0 you can write the token as last part of the path in URL instead of as a query string. The above example will looke like rtmp://127.0.0.1:1935/live/12345.stream/abc. This allows you to enter the token into the "stream key" field in some clients.
Via the RTMP endpoint in the API you can gather a list of the currently publishing RTMP resources.