Feature: Support device discovery on multiple Z2MQTT networks

[macpit]

Original issue: Sian-Lee-SA#421

Problem

Discovery only works with the default MQTT base topic from the blueprint (e.g., zigbee2mqtt/+/action). Users with a second Z2MQTT instance using a different base topic (e.g., zigbee2mqtt_garage/+/action) cannot discover devices.

Workaround

Manual topic entry already works — users can type the full topic manually.

Proposed Fix

Add a "Custom MQTT base topic" option in the identifier auto-discovery dialog.

Affected Files

• custom_components/switch_manager/models.py (start_discovery)
• frontend/src/dialogs/identifier-auto-discovery.ts

Effort

Medium (4-8h)

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Migrated from original repo

[spacerunner5]

Intriguing idea ;-)

What about home assistant / autodiscovery itself, which z2m publishes to? I know this would be overkill to implement, but would probably solve the issue too. Just a shot in the dark, since I don't run multiple z2m instances.

Thanks for marinating :)