The BMS only allows one simultaneous BLE connection. Keeping a persistent
connection blocked the mobile app from connecting at all.
Changes:
- BmsBluetoothHandler: replace connect()/disconnect()/request() public API
with a single poll() method that owns the full connect→read→disconnect
lifecycle. Connection is held only for the duration of one data fetch.
- Coordinator: gutted connection-state management — _async_update_data now
just calls handler.poll() and processes results. No reconnect loop needed.
- Poll interval defaults: 15s default, 10s min, 300s max. The BLE connect
overhead (~2s) makes sub-10s intervals impractical.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Jannis
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