Levandor

telep-tv AirPlay vanishes from mDNS after a uxplay restart (avahi-compat re-register race)

2 min read

telep-tv disappears from AirPlay discovery after a uxplay restart even though both uxplay.service and avahi-daemon stay active — because uxplay’s avahi-compat layer doesn’t reliably re-register its mDNS records against a restarted/hiccuping avahi. Fix: restart avahi first, then uxplay.

For Agents

Host: telep-mainframe (telep-mainframe, uxplay 1.71). Symptom string on devices: ⚠ telep-tv nem látszik mDNS-en. Distinct from the avahi multi-interface / DHCP-flap / router AP-isolation causes in 2026-08-04-telep-mainframe-airplay-receiver-uxplay — here avahi itself is healthy (still advertises _nut._tcp, the HP printer), only uxplay’s _airplay._tcp/_raop._tcp records are silently gone. Fix order matters: avahi → sleep 2 → uxplay.

Symptoms

  • Devices show ⚠ telep-tv nem látszik mDNS-en (telep-tv not visible on mDNS).
  • systemctl is-active uxplay avahi-daemon → both active.
  • avahi-browse -rt _airplay._tcp and avahi-browse -rt _raop._tcp return nothing for telep-tv.
  • Yet avahi still advertises other services (_nut._tcp, the HP printer) → avahi itself is fine; only uxplay’s records vanished.
  • Observed 2026-08-30 after a uxplay restart at 21:56.

Root cause

uxplay (1.71) publishes its AirPlay/RAOP mDNS records via avahi-compat-libdnssd → avahi-daemon over D-Bus. Across a uxplay restart — or any avahi/D-Bus hiccup — the compat layer does not reliably re-register. uxplay keeps running, but its _airplay._tcp/_raop._tcp adverts are silently gone, so no device can discover the receiver.

Fix (order matters)

Restart avahi first, then uxplay, so uxplay registers against a fresh avahi:

sudo systemctl restart avahi-daemon
sleep 2
sudo systemctl restart uxplay

Restarting uxplay alone can hit the same race

systemctl restart uxplay on its own re-registers against the same avahi instance and can silently fail to re-advertise again. Always bounce avahi first.

Verify

avahi-browse -rt _airplay._tcp     # telep-tv@telep-mainframe  AirPlay Remote Video @ 192.168.1.123:34625
avahi-browse -rt _raop._tcp        # ...@telep-tv@telep-mainframe  AirTunes Remote Audio

Both records back → re-open the AirPlay picker on the phone/Mac.

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