open fun writeHandlerID(): String
When a NetSocket is created it automatically registers an event handler with the event bus, the ID of that handler is given by writeHandlerID.
Given this ID, a different event loop can send a buffer to that event handler using the event bus and that buffer will be received by this instance in its own event loop and written to the underlying connection. This allows you to write data to other connections which are owned by different event loops.
Return
the write handler ID