[BUG] MQTT "Base Topic" change breaks HomeAssistant's AutoDiscovery

[KaktusXY]

Describe the bug

When the "MQTT Base Topic" setting in OpenMQTTGateway (OMG) is changed to include additional layers (e.g. from the default home/ to home/devices/), the Home Assistant MQTT discovery messages do not update to reflect the new topic structure correctly. The stat_t in the discovery message remains tied to the default structure, even though the base topic has changed.

To Reproduce

1. Change the "MQTT Base Topic" in OMG to include a different number of layers than the default (e.g. home/devices/).
2. Enable Home Assistant auto-discovery.
3. The MQTT devices appear in Home Assistant but with an unknown status, and the value stat_t of the HA AutoDiscovery message is not updated to reflect the new base topic.

Expected behavior

The stat_t value in the Home Assistant MQTT discovery messages should update to include the new topic structure, such as including the additional layers when the "MQTT Base Topic" is changed.

Environment:

• Version: "v1.8.0"
• Environment: "lilygo-rtl_433"

Default behavior

• MQTT Base Topic: home/

Auto-discovery Topic: homeassistant/sensor/[DEVICE]/config :

{
  "stat_t": "+/+/RTL_433toMQTT/[DEVICE]/0",
  ...
}

Current behavior (after changing to home/devices/)

• MQTT Base Topic: home/devices/

Auto-discovery Topic: homeassistant/sensor/[DEVICE]/config:

{
  "stat_t": "+/+/RTL_433toMQTT/[DEVICE]/0",
  ...
}

Expected behavior (after changing to home/devices/)

• MQTT Base Topic: home/devices/

Auto-discovery Topic: homeassistant/sensor/[DEVICE]/config:

{
  "stat_t": "+/+/+/RTL_433toMQTT/[DEVICE]/0",
  ...
}