How to force the Display Screen to re-publish MQTT auto-discovery
The Display Screen publishes Home Assistant auto-discovery configs every time it connects to MQTT. To force a fresh publish, just trigger a reconnect.
Option 1 — Toggle Wi-Fi (fastest)
On the tablet, open Settings → Wi-Fi.
Turn Wi-Fi off, wait two seconds, turn it back on.
When the panel reassociates, it reconnects to your MQTT broker and publishes every discovery config fresh.
Option 2 — Re-save MQTT settings
On the tablet, open Settings → MQTT.
Change any field (broker address, port, username), then change it back to the correct value.
Tap Save.
The panel drops the MQTT connection, reconnects, and republishes.
Option 3 — Reboot the tablet
Hold the power button and choose Restart. Same result — MQTT reconnects on boot and discovery publishes.
Why this works
Discovery messages are published with the MQTT retained flag, so they sit on your broker until either the panel replaces them or you manually delete them. Every MQTT reconnection re-publishes the whole set, which overwrites anything stale.