AirPlay RTSP session loses synchronization during /feedback heartbeat on tvOS 26.5

[bdentzer]

Environment

• pyatv 0.18.0
• Apple TV 4K (AppleTV6,2)
• tvOS 26.5
• macOS 26.5.2
• Apple TV connected by Ethernet
• ASUS ZenWiFi BQ16 mesh (Apple TV on satellite node)

Problem

Running a standalone connection with:

~/.homebridge/appletv-enhanced/.venv/bin/atvremote \
  --scan-hosts 192.168.1.XXX \
  push_updates

connects successfully.

Approximately 35–40 seconds later:

WARNING [pyatv.support.http]:
Got response without having a request:
HttpResponse(
 protocol='RTSP',
 code=200,
 CSeq=20,
 ...
)

Immediately afterward:

Connection lost

followed by:
TimeoutError

originating from:

pyatv/core/protocol.py

↓

pyatv/protocols/airplay/ap2_session.py

↓

_send_feedback()

↓

rtsp.feedback()

↓

exchange()

↓

TimeoutError

Full Traceback

Connection lost, stack trace below:

File ".../pyatv/core/protocol.py", line 57, in heartbeater
    await sender_func(message)

File ".../pyatv/protocols/airplay/ap2_session.py", line 95, in _send_feedback
    await self.rtsp.feedback()

File ".../pyatv/support/rtsp.py", line 248, in feedback
    return await self.exchange("POST", uri="/feedback")

File ".../pyatv/support/rtsp.py", line 320, in exchange
    raise TimeoutError(...)

Immediately before the timeout:

WARNING
Got response without having a request

HttpResponse(
 protocol='RTSP',
 code=200,
 message='OK',
 CSeq=20
)

Expected behavior

If a delayed or unexpected RTSP response is received:

• either associate it with the outstanding request if appropriate,
• or recover gracefully without terminating the AirPlay session.

The current behavior causes the AirPlay heartbeat to fail and the connection to be lost.

Additional question
Is this a known compatibility issue with tvOS 26.5’s AirPlay RTSP implementation, or does the warning

Got response without having a request

indicate a regression in the AirPlay heartbeat handling introduced after tvOS 26?

[gcamp]

I have the same issue