SMS1 shows “No Response”.

1. Upgrade the firmware of the HomeKit hub (HomePod, Apple TV 4th, iPad).
2. Upgrade the firmware of SMS1.
3. Make sure the same Apple ID is used in both SMS1 and the HomeKit hub.
4. Make sure the SMS1 is within connecting range of the HomeKit hub.
5. Make sure Bluetooth is turned on in your iOS device.