How can I check Bluetooth On/Off State?

[JAICHANGPARK]

I'd like to check Bluetooth On/Off State before connection

Can I check this?

[FWeissenb]

There is an "isOn"

Should be something like (untested)

var isOn = await FlutterBluetoothSerial.instance.isOn;

if(isOn) {
//TODO
}

[AgainPsychoX]

In few days there might be: See #35

[AgainPsychoX]

The pull request #35 will be merged soon, and it adds the option, so the issue is being closed.
And there is syntax:

// Single call check
bool isEnabled = await FlutterBluetoothSerial.instance.isEnabled;

// Or listening for changes
FlutterBluetoothSerial.instance.onStateChanged().listen((BluetoothState state) {
    // The `BluetoothState` has enum-like interface with `isEnabled` getter (true if `state == BluetoothState.STATE_ON` 
    print(state.isEnabled); 
});