DBus-proxy: support for BlueZ and multiple agents

[jkuro-tii]

Description

DBus Proxy:

• Added support for BlueZ (Bluetooth stack).
• Enabled handling of multiple DBus agents.

• Related Issues

Update of the DBus-proxy

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Dependency update
• Nix configuration change
• Other (please describe):

Changes Made

• Added multi agent support for BlueZ and NetworkManager.
• Enabled registration of multiple agents.
• Removed the nm-mode parameter and the NM_SECRET_AGENT_XML environment variable.

Testing Done

• Built locally with nix build .#<package-name>
• Ran nix flake check (all packages build successfully)
• Ran nix fmt -- --fail-on-change (formatting check passed)
• Ran reuse lint (license compliance verified)
• Tested in Ghaf environment (if applicable)
• Manual testing performed:

• bluetoothctl - power on/off, scan on/off/le, connect, disconnect
• using blueman-applet functions - search, connect, power on/off

Package Impact

Affected packages:

• None

Screenshots/Logs

Click to expand

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Checklist

• Code follows project style guidelines (nix fmt passed)
• SPDX license headers added to all new files
• Documentation updated (README, inline comments, etc.)
• No trailing whitespace in modified files
• Commit messages follow guidelines
• No breaking changes (or clearly documented if unavoidable)
• Security implications considered (no secrets, proper validation)
• Nix best practices followed (no rec, explicit lib. usage)

Additional Notes

---

[jkuro-tii]

Draft PR for Ghaf: tiiuae/ghaf#1899

[enesoztrk]

please, @jkuro-tii push the latest changes you made.