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The single-connection barrier from the last round was correct and was being bypassed. shutdown_broadcaster() popped the broadcaster out of the registry and only then awaited its teardown, so while the socket was still closing the slot sat empty: a /camera/stream request landing in that window minted a broadcaster with no predecessor and dialled port 6000 immediately. A page reload fires /camera/stop and the new stream request concurrently, so a P1S ended up holding two connections, kept feeding the orphan, and starved the live viewer until its TCP keepalive reaped the dead one ~20 min later. The stopped broadcaster now stays in the registry so the successor chains behind its socket close. The camera page also rendered the <img> src before the stream token arrived whenever auth was disabled, then swapped it once the token landed — aborting the in-flight request and issuing a second one. With auth off both reached the backend, so every load attached two viewers to a one-socket printer. The src now waits for the token query to settle. Subscribers only checked for client disconnect after yielding a frame or on a 30s idle timeout, so a viewer that left during a black stream stayed counted — and /camera/stop trusts that count to decide whether to tear the upstream down.
