DittoBusStreamDelegate

The operation to enqueue outgoing data on a stream has completed. More data may now be enqueued.

The message sequence number may be used to track when the remote side has fully acknowledged receipt.

error will be non-nil if the operation failed.

The stream has closed. This can be triggered by calling close() or by the remote peer doing the same.

A new message has been received from the specified stream.

The remote peer has acknowledged receipt of all messages up to the given sequence number.