Fix websockets 16.0 compatibility

[Copilot]

Dependabot updated websockets from 15.0.1 to 16.0, causing HTTP 401 errors during WebSocket handshake. Previous fix attempts incorrectly used Subprotocol(token), but Subprotocol is a type alias, not a constructor.

Changes

• WebSocket connection: Reverted to standard form websockets.connect(..., subprotocols=[token])
• Validation: Added environment variable checks for SKYWAY_APP_ID and SKYWAY_SECRET_KEY
• Debug logging: Added websockets debug logging and connection diagnostics (sensitive data redacted)

# Before (incorrect)
from websockets.typing import Subprotocol
async with websockets.client.connect(url, subprotocols=[Subprotocol(token)]):
    ...

# After (correct)
async with websockets.connect(url, subprotocols=[token]):
    ...

Compatible with websockets 16.0 and pyjwt 2.11.0 per RFC 6455.

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[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• echo.websocket.org
  • Triggering command: /usr/bin/python3 python3 test_subprotocol.py bin/WALinuxAgent-2.15.0.1-py3.12.egg -collect-logs (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)