ConnectToServer connects to the server at server and returns a MessageSender to communicate with the master.

PingHandler handle a PingMessage.

StartServer starts a music-sync server listening at address and returns a MessageSender to broadcast to clients.

NewClientHandler is called when a new client connects to the server (with channel -1) and when a client subscribes to a channel.

BaseTypedPackageHandler implements all TypedPackageHandlerInterface methods without doing anything.

TypedPackageHandler calls the handle functions of TypedPackageHandlerInterface.

MessageSender is an interface used to send protobuf messages to clients/the server.

TypedPackageHandlerInterface has methods to handle all packages received.