Broadcasting message to cluster

Is there an easy way to broadcast a payload to all other members of the cluster. I've looked through the documentation and the only way to do it seems to be to implement Delegate, however I'm having difficulty understanding what the majority of the interface functions are supposed to do. It would be useful to have an example use case of the library beyond just connecting to a cluster

Start by reviewing the existing documentation and the Delegate interface described in the issue, focusing on how a payload could be broadcast to all cluster members. Add a concrete example use case beyond connecting to a cluster and clarify the relevant interface functions; done means a newcomer can follow the example and understand the required Delegate behavior.

Written by the indexing model from the issue text.