Support for RS-485 adapters

[Ares4570]

I came across this project while troubleshooting some issues with the "bwalink" docker container and figured this might be a more seamless integration.

I'm running into issues adding the spa connection - it's not clear how Spa Client is trying to connect to the adapter, but I think it's through TCP/4257. Must be a difference in protocols as even running a TCP/4257 server on the RS-485 adapter (Elfin EW11 in this case) doesn't work but does produce an error vs outright refusal.

Error setting up entry for spaclient Traceback (most recent call last): File "/usr/src/homeassistant/homeassistant/config_entries.py", line 635, in __async_setup_with_context result = await component.async_setup_entry(hass, self) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/config/custom_components/spaclient/__init__.py", line 71, in async_setup_entry await spa.send_configuration_request() File "/config/custom_components/spaclient/spaclient.py", line 818, in send_configuration_request self.read_msg() File "/config/custom_components/spaclient/spaclient.py", line 198, in read_msg length = len_chunk[1] ~~~~~~~~~^^^ IndexError: index out of range

Since balboa_worldwide_app supports RS-485 adapters, hoping that functionality can be exposed here as well.

Thanks!

[plmilord]

I did not work on the integration through the RS-485 protocol. I only exploited the bwa Wi-Fi Module (50350).