I have a Tuya WIFI GSM alarm system to which I have added all sensors. I bought a separate Tuya outdoor siren which will not add to the alarm system devices. I have added the alarm system to the Smart Life app and I can add the siren to the app. If adding a device to the alarm system within the app it will only allow to do so by scanning and cannot be done manually. How can I make the siren trigger when the alarm system is activated? Surely this is a key requirement for an alarm system.