Make udp component able to send and listen to IPv6 multicast

[HeMan]

What does this implement/fix?

Types of changes

• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Code quality improvements to existing code or addition of tests
• [ ] Other

Related issue or feature (if applicable):

• fixes

Pull request in esphome-docs with documentation (if applicable):

• esphome/esphome-docs#4891

Test Environment

• [x] ESP32
• [x] ESP32 IDF
• [ ] ESP8266
• [ ] RP2040
• [ ] BK72xx
• [ ] RTL87xx

Example entry for config.yaml:

# Example config.yaml

Checklist:

• [x] The code change is tested and works locally.
• [ ] Tests have been added to verify that the new code works (under tests/ folder).

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

• [ ] Documentation added/updated in esphome-docs.

[probot-esphome[bot]]

Hey there @clydebarrow, mind taking a look at this pull request as it has been labeled with an integration (udp) you are listed as a code owner for? Thanks! _{^{(message by CodeOwnersMention)}}

[codecov-commenter]

Codecov Report

:x: Patch coverage is 28.57143% with 5 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 72.45%. Comparing base (fd64585) to head (3bdd7c6).

Files with missing lines	Patch %	Lines
esphome/config_validation.py	16.66%	5 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #8533      +/-   ##
==========================================
- Coverage   72.45%   72.45%   -0.01%     
==========================================
  Files          53       53              
  Lines       11114    11117       +3     
  Branches     1501     1501              
==========================================
+ Hits         8053     8055       +2     
- Misses       2672     2673       +1     
  Partials      389      389              

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[esphome[bot]]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks :+1:

Learn more about our pull request process.

[github-actions[bot]]

To use the changes in this PR:

# Clone the repository:
git clone https://github.com/esphome/esphome
cd esphome

# Checkout the PR branch:
git fetch origin pull/8533/head:udp-ipv6
git checkout udp-ipv6

# Install the development version:
script/setup

# Activate the development version:
source venv/bin/activate

Now you can run esphome as usual to test the changes in this PR.

---

(Added by the PR bot)

[github-actions[bot]]

👋 Hi there! This PR modifies 5 file(s) with codeowners.

@esphome/core - As codeowner(s) of the affected files, your review would be appreciated! 🙏

Note: Automatic review request may have failed, but you're still welcome to review.

[dwmw2]

Does this also add unicast support? Now that ESPHome includes a syslog component which is based on the udp component, it's a regression from the external one which I was previously using that supported IPv6.

[HeMan]

Does this also add unicast support? Now that ESPHome includes a syslog component which is based on the udp component, it's a regression from the external one which I was previously using that supported IPv6.

Yes

[DJJo14]

Does this udp ipv6 also work for openthread? specially with package transport?

[dwmw2]

Any progress on this? I'd like to fix the syslog again; it regressed into the 1990s when it was merged. The external component used to support IPv6.

[HeMan]

@dwmw2 I bumped into a problem with libretiny-devices. I think the Arduino code needs to be upgraded.

[dwmw2]

What's the LibreTiny issue? I already upgraded the LWIP there last year, I think.