Added regexp validation allowing Twilio notifications to use Sender ID instead of phone number

[psvanstrom]

Description:

Twilio now supports alphanumerical sender IDs to be used when sending SMS, see https://support.twilio.com/hc/en-us/articles/223181348-Getting-started-with-Alphanumeric-Sender-ID for more information. Sender IDs are available for all paid Twilio accounts and are supported in most countries.

The upside of using sender IDs instead of phone numbers is that you don't have to subscribe to a phone number, the only cost when sending SMS messages will be the actual fee for the message.

This PR updates the regular expression validating the from_number configuration parameter so that it allows both phone numbers as well as sender IDs, by applying the rules enforced by Twilio:

Alphanumeric Sender ID supports up to 11 characters from the following categories:
Upper-case letters A-Z
Lower-case letters a-z
Numbers 0-9
Spaces
Your ID must include at least one letter; It cannot be comprised of only numbers. Non-ASCII special characters and punctuation are not allowed.

Example entry for configuration.yaml:

notify:
  - name: NOTIFIER_NAME
    platform: twilio_sms
    from_number: MyHouse

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.

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

• Documentation added/updated in home-assistant.io

Pull request in home-assistant.io with documentation (if applicable): home-assistant/home-assistant.io#7980

[fabaff]

@psvanstrom, could you please update the requirement in a different PR as you have a working Twilio setup to test it?

Thanks

[psvanstrom]

@fabaff I'd love to, but I don't really understand what you mean with "update the requirement"? 😄 This is my first PR in home-assistant so I might have missed something obvious?

[fabaff]

The Twilio component (twilio/__init__.py) has REQUIREMENTS = ['twilio==6.19.1']. This defines the release of the module we are using. The latest release of twilio is 6.22.0. It's always good to test the upgrades of the Python modules and a real test requires that a person has a working setup and is using the integration.

Change the requirement (REQUIREMENTS = ['twilio==6.22.0']) and run script/gen_requirements_all.py.

[psvanstrom]

Ah ok, will do that! Is it ok if I do that in this PR or should it be in a separate one?

[fabaff]

Please create a new PR. Easier to keep track of changes if there is one per PR and the IPv6 support seems to be independent from an upgrade to the Twilio Python module.