The config a shade publishes for MQTT discovery moves to MqttDisco, with
11 unit tests: the topics, the device, which way each kind of shade
opens, tilt, tilt only and dry contacts.
A deleted group's retained sunSensor topic was never cleared: unpublish
named it SunSensor.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
