How do I create a characteristic that changes its value?

[reteps]

I want a read-only characteristic that updates every 30 seconds with a random number. How can I do this @mikolak?

const myCharacteristic = new SimulatedCharacteristic({
    uuid: '90',
    id: 91,
    isReadable: true,
    isWritableWithResponse: false,
    isWritableWithoutResponse: false,
    isNotifiable: false,
    value: ???
})

[mikolak]

In the constructor of SimulatedPeripheral you should get a reference to the characteristic you want to modify, set up a connection listener and on connection set up an interval that writes to the characteristic every 30 second, and clear that interval on disconnection.