Detected blocking call to open with args ('/config/packet.log', 'a')

[donaldwpage]

Describe the bug
A clear and concise description of what the bug is.
Home Assistant system log reports blocking call in ramses_cc

To Reproduce
Steps to reproduce the behaviour (for example):
Install HACS
Install ramses_rf 0.50.0

Expected behavior
A clear and concise description of what you expected to happen.

Please complete the following information:

• ramses_cc: section from configuration.yaml
• section is empty
• contemporaneous portion of the home-assistant.log
• contemporaneous portion of the packet.log

> Logger: homeassistant.util.loop
> Source: util/loop.py:136
> First occurred: 21:00:53 (1 occurrences)
> Last logged: 21:00:53
> 
> Detected blocking call to open with args ('/config/packet.log', 'a') inside the event loop by custom integration 'ramses_cc' at custom_components/ramses_cc/broker.py, line 146: await self.client.start(cached_packets=cached_packets()) (offender: /usr/local/lib/python3.13/logging/__init__.py, line 1247: return open_func(self.baseFilename, self.mode,), please create a bug report at https://github.com/zxdavb/ramses_cc/issues For developers, please see https://developers.home-assistant.io/docs/asyncio_blocking_operations/#open 

Traceback (most recent call last): File "<frozen runpy>", line 198, in _run_module_as_main 
File "<frozen runpy>", line 88, in _run_code 
File "/usr/src/homeassistant/homeassistant/__main__.py", line 227, in <module> 
 sys.exit(main()) 
File "/usr/src/homeassistant/homeassistant/__main__.py", line 213, in main 
 exit_code = runner.run(runtime_conf) 
File "/usr/src/homeassistant/homeassistant/runner.py", line 154, in run
 return loop.run_until_complete(setup_and_run_hass(runtime_config)) 
File "/usr/local/lib/python3.13/asyncio/base_events.py", line 708, in run_until_complete
 self.run_forever() 
File "/usr/local/lib/python3.13/asyncio/base_events.py", line 679, in run_forever
 self._run_once() 
File "/usr/local/lib/python3.13/asyncio/base_events.py", line 2027, in _run_once
 handle._run() 
File "/usr/local/lib/python3.13/asyncio/events.py", line 89, in _run
 self._context.run(self._callback, *self._args) 
File "/usr/src/homeassistant/homeassistant/setup.py", line 165, in async_setup_component
 result = await _async_setup_component(hass, domain, config) 
File "/usr/src/homeassistant/homeassistant/setup.py", line 461, in _async_setup_component
 await asyncio.gather( 
File "/usr/src/homeassistant/homeassistant/setup.py", line 463, in <genexpr>
 create_eager_task( 
File "/usr/src/homeassistant/homeassistant/util/async_.py", line 45, in create_eager_task
 return Task(coro, loop=loop, name=name, eager_start=True) 
File "/usr/src/homeassistant/homeassistant/config_entries.py", line 788, in async_setup_locked
 await self.async_setup(hass, integration=integration) 
File "/usr/src/homeassistant/homeassistant/config_entries.py", line 551, in async_setup
 await self.__async_setup_with_context(hass, integration) 
File "/usr/src/homeassistant/homeassistant/config_entries.py", line 640, in __async_setup_with_context
 result = await component.async_setup_entry(hass, self) 
File "/config/custom_components/ramses_cc/__init__.py", line 94, in async_setup_entry
 await broker.async_setup() 
File "/config/custom_components/ramses_cc/broker.py", line 146, in async_setup
 await self.client.start(cached_packets=cached_packets())

Additional context
Add any other context about the problem here, such as the make/model of your hardware.
evofw3 atmega32u4 - /dev/serial/by-id/usb-SparkFun_evofw3_atmega32u4-if00, s/n: n/a - SparkFun - 1B4F:9206

gateway_config

disable_discovery: false
disable_qos: false
disable_sending: false
enable_eavesdrop: false

schema:
"01:108199": {}

known_device_ids:
"01:108199": {}
"02:022960": {}
"04:024890": {}
"04:049506": {}
"04:112432": {}
"04:123648": {}
"04:123650": {}
"04:123652": {}
"04:123654": {}
"04:125369": {}
"04:246790": {}
"07:030355": {}
"13:142019": {}
"13:181949": {}
"18:069148":
  alias: evofw3
  class: HGI
"34:007977": {}
"34:009973": {}

[zxdavb]

Same design fault as #208