Add select source to soundtouch

[boxcee]

Proposed change

It is impossible to change the source of the SoundTouch at the moment. This PR should add the functionality to change source.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

The integration reached or maintains the following Integration Quality Scale:

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[boxcee]

@da-anda care to take a look at this?

[da-anda]

@boxcee I think @MartinHjelmare is more qualified for this. I can do some testing if you like. Having a look at your code I just wondered where/how HA would get the list of selectable sources. You probably would need some form of enumeration for this since I'm not sure that all soundtouch devices support BT and AUX. libsoundtouch doesn't seem to provide this info from a quick look though

[da-anda]

you also might want to have a look here CharlesBlonde/libsoundtouch#34 and here #31071

[boxcee]

Ah, thanks. There is also #31669.

[homeassistant]

Hi @boxcee,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

[jtommi]

Hi @boxcee ,
I'm the one from #31669.
May I use some of your code to finish the feature ?
My merge request is slow because some tests are failing and I'm currently going through a book about Test driven development in Python to feel more comfortable with that stuff.
I'd also be very happy to work together on this feature.

[boxcee]

@jtommi Most definitely. Will close this one then, okay?