Registers a one-shot publication for to (bare-JID matched) and builds the element. Nothing is sent — the peer moves next.
to
Drives start → starting → SI offer → accept → IBB. Lazy: the handshake begins on first read of the returned stream.
Optional
Static
Registers a one-shot publication for element. Nothing is sent — the peer moves next.
to(bare-JID matched) and builds the