The dev drive, plugged into another PC that was offline and then connected,
ran two sessions with no live aircraft. Its API log, on the drive, says why:
"upstream: live mode off (ODIAN_UPSTREAM_URL is unset)" - both times.
Root cause: live mode is decided when the stack starts (StackConfig::
upstream_url = Inner::engine_url), and engine_url was only ever learned from a
site probe and held in MEMORY. A launcher opened offline has none, and it probes
again only on window focus (30 s debounce) or the refresh button - so a Launch
pressed after connecting still used the offline answer, the API got no
ODIAN_UPSTREAM_URL, and live_loop (which would have synced the offline edits and
switched the API to the DHP when the network came) never started.
- launch() re-probes the site first when the launcher thinks it is offline (one
probe, 2 s at most on a PC that really is). It is also the update check a
launch from a stale "offline" skipped.
- The Engine API address is kept in launcher.json (LauncherState::engine, keyed
by site like tile_sync) and loaded at start, so a session started offline
still arms live mode and goes live by itself once the network is back - the
path live_loop already handles. Changing the DHP address in Settings drops it.
Spot-check: state::tests - per-site, unchanged-is-no-write, survives save/load,
and a launcher.json from before the field still loads.
JIMMY_JFEXP
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