Integration fails with Python 3.14 / Home Assistant 2026.x

[Kazenosho]

System Health details

Environment:

• Home Assistant OS 17.3
• Home Assistant Core 2026.6.x
• Python 3.14
• Hardware: Raspberry Pi 4 4GB
• RFPlayer: RFP1000 (USB, FTDI FT232R chip)

Checklist

• I have enabled debug logging for my installation.
• I have filled out the issue template to the best of my ability.
• This issue only contains 1 issue (if you have multiple issues, open one issue for each issue).
• This issue is not a duplicate issue of any previous issues..

Describe the issue

Bug report: Integration fails with Python 3.14 / Home Assistant 2026.x

Description:
The integration fails to load and unload properly due to an incompatibility between serial_asyncio_fast and Python 3.14's asyncio event loop handling.

Error logs:

RuntimeError: no running event loop
  File "/usr/local/lib/python3.14/site-packages/serial_asyncio_fast/__init__.py", line 36, in _create_background_task
    task = asyncio.create_task(coro)
  File "/usr/local/lib/python3.14/asyncio/tasks.py", line 394, in create_task
    loop = events.get_running_loop()

Error unloading entry /dev/serial/by-id/usb-FTDI_FT232R_USB_UART_A10R682X-if00-port0 for rfplayer

Behavior:

• The RFPlayer USB device is correctly detected at /dev/ttyUSB0
• The device physically blinks when RF signals are received
• The integration fails silently — no events are fired in Home Assistant
• The integration crashes on unload with the above traceback

Root cause (suspected):
Python 3.14 changed the behavior of asyncio.create_task() — it now requires a running event loop in the current thread. The _create_background_task function in serial_asyncio_fast calls asyncio.create_task() outside of a running loop context, which raises RuntimeError.

Workaround:
None found. The integration is currently unusable on HA 2026.x / Python 3.14.

Thank you for your work on this integration. Happy to provide additional logs if needed.

Reproduction steps

...

Debug logs

**Error logs:**

RuntimeError: no running event loop
  File "/usr/local/lib/python3.14/site-packages/serial_asyncio_fast/__init__.py", line 36, in _create_background_task
    task = asyncio.create_task(coro)
  File "/usr/local/lib/python3.14/asyncio/tasks.py", line 394, in create_task
    loop = events.get_running_loop()



Error unloading entry /dev/serial/by-id/usb-FTDI_FT232R_USB_UART_A10R682X-if00-port0 for rfplayer


**Behavior:**

Diagnostics dump

No response

[lacolliniere]

Me too…