A plain HTTP API
POST a JSON body to port 8090 and the card appears. curl, shell scripts, Home Assistant, a point-of-sale system or a cron job all work the same way.
API reference
One HTTP request draws a large card over whatever is playing. No cloud, no accounts, nothing leaves your LAN.
Install the APK, grant the overlay permission, then from any machine on the same network:
curl -X POST http://TV_IP:8090/notify \
-H 'Content-Type: application/json' \
-d '{"title": "Kitchen", "message": "Dinner is ready"}'The card shows for eight seconds and slides away. Everything else, from colors and sounds to persistent cards you clear yourself, is a field on that JSON body. Start with Getting started or jump to the API reference.