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Previously the SSH-capable branch and the telnet-only branch were
mutually exclusive — speakers with both transports reachable only
got the curl-from-device HTTPS check, never the round-trip probe.
That left a class of bugs invisible to pre-flight: an asymmetric
network path where the speaker's userspace can reach our service
(curl works) but the swUpdateUrl fan-out can't (or vice versa).
Each transport now gets its own check; both run when both are
reachable. The two exercise meaningfully different code paths in
the speaker:
- SSH curl-from-device: speaker's normal userspace HTTP stack
over an arbitrary inbound TCP to our HTTP/HTTPS port.
- Telnet round-trip: speaker's firmware-internal swUpdateCheck
fan-out, which writes to its own DNS resolver and outbound
HTTP code path that the curl test doesn't go near.
A speaker that passes one and fails the other reveals a real
connectivity asymmetry worth surfacing before the migration
writes its target URLs.
Cost: ~1s extra on the success path (probe is fast on healthy FW
27.0.6), up to ~6s extra on the timeout path. The probe restores
the runtime swUpdateUrl unconditionally so there's no lingering
state regardless of outcome.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>