case classSubscribe(payload: Seq[Byte]) extends PubSubOption with Product with Serializable
The Subscribe option shall establish a new message filter on a akka.zeromq.SocketType.Pub socket.
Newly created akka.zeromq.SocketType.Sub sockets shall filter out all incoming messages,
therefore you should send this option to establish an initial message filter.
An empty payload of length zero shall subscribe to all incoming messages.
A non-empty payload shall subscribe to all messages beginning with the specified prefix.
Multiple filters may be attached to a single akka.zeromq.SocketType.Sub socket,
in which case a message shall be accepted if it matches at least one filter.
The Subscribe option shall establish a new message filter on a akka.zeromq.SocketType.Pub socket. Newly created akka.zeromq.SocketType.Sub sockets shall filter out all incoming messages, therefore you should send this option to establish an initial message filter.
An empty payload of length zero shall subscribe to all incoming messages. A non-empty payload shall subscribe to all messages beginning with the specified prefix. Multiple filters may be attached to a single akka.zeromq.SocketType.Sub socket, in which case a message shall be accepted if it matches at least one filter.
the topic to subscribe to