Add SHUNT support with notification handler and backoff #66
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Summary
Adds SHUNT device support using a notification-based handler (no polling).
Adds connection backoff to avoid BLE slot contention with polling controllers.
Prevents numeric sensors from throwing errors when unavailable by returning None.
Changes
custom_components/renogy/ble.py: SHUNT notification handler + retry backoff.
custom_components/renogy/shunt_handler.py and shunt_parser.py: SHUNT connection + packet decoding.
custom_components/renogy/sensor.py: guard against "unavailable" values.
Testing
SHUNT streams data when a slot is available.
Controllers continue 60s polling.
No "unavailable" ValueError in logs.