The answer on <root>/discover_r called the publisher directly; a publisher
that threw or rejected was only caught by the handler meant for listeners
of "discover". It now takes the path of every device message: send()
resolves, and a failure goes to the "error" event when somebody listens.
A test covers a publish that fails, throws and rejects, with and without
an "error" listener: receive() resolves each time and "discover" is not
emitted.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
David
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