[Feature Request] Add support for Anker SOLIX C2000 power station

[JBEngineHouse]

Anker SOLIX C2000 Gen 2

SolixBLE version: 3.9.0, running on Ubuntu (BlueZ via Bleak)

Key facts: connection succeeds, 5-stage negotiation completes including ECDH key exchange, device identifies as "Charging", firmware v0.0.5.2, serial AFYDKPN0F49300504

Device

• Model: Anker SOLIX C2000 Gen 2
• Serial prefix: AFYDKPN0... (redacted)
• Device firmware (reported during negotiation): v0.0.5.2

Environment

• SolixBLE version: 3.9.0 (installed via pip)
• OS: Ubuntu 24.04.4 LTS (Linux, BlueZ via Bleak)
• Connection method: BleakClient over BLE, automatic retry connector

Summary

The C2000 is not yet supported by SolixBLE. Connecting via the Generic class
completes the entire 5-stage negotiation handshake successfully, including the
ECDH key exchange, but no telemetry/state packets are ever received afterward
(LAST_UPDATE remains None, AVAILABLE stays False), and no keep-alive task
is registered for this model.

What works

1. Device discovery — advertises with local name (serial) and service UUID
   0000ff09-0000-1000-8000-00805f9b34fb ✓
2. BLE connection — succeeded on first attempt via bleak-retry-connector ✓
3. Subscriptions — StartNotify on characteristic 8c850003-0302-41c5-b46e-cf057c562025
   confirmed (Notifying: true) ✓
4. Full negotiation sequence — stages 1 through 5 all completed:
   • Stage 1/2/3 exchanged successfully
   • Stage 3 response contained device metadata, decoded as:
     • Mode: Charging
     • Firmware: v0.0.5.2
     • Serial (redacted)
   • Stage 4 completed
   • Stage 5: device public key received, shared secret derived
   • Final log line: Negotiations with '...' succeeded!
5. Keep-alive attempted but: No keep-alive task registered, stopping task...

What doesn't work

• No state/telemetry notifications arrive after negotiation completes. The device
  receives no property/state requests because Generic has no command or
  property table for the C2000.
• Resulting device state after 20s connected:

Notes / observations

• The full negotiation + key exchange succeeding suggests the C2000 uses the same
  (or a very similar) protocol to the other supported Solix power stations, and the
  missing piece is the per-model state/property command table and keep-alive
  definition.
• The device responded cooperatively throughout and did not reject any commands.
• Happy to capture additional logs on request, or to test development builds.

Attachments

• Full debug log (logging.DEBUG), serial/MAC redacted: see attached
  debug-redacted.txt. Includes complete hex exchange for all negotiation stages
  and the keep-alive attempt.

debug-redacted.txt

[kb1ibt]

there's 2 different PRs that have been trying to add this #50 and #67.
additionally I will be rebasing #50 in the next few hours so it is based on #61 with an even wider control scope