React-native-ble-plx: device.isConnected does not return the true connection state

[lastmjs]

The following code prints incorrect information as far as I can tell:

console.log('await device.isConnected()', await device.isConnected()); // logs false
await device.connect();
console.log('await device.isConnected()', await device.isConnected()); // logs false

The first log statement should be false, but the second log statement should be true.

[lastmjs]

I think I see what's happening, the device.isConnected() call is returning an updated device, but the state of the original device does not update. Though I love functional programming, this is very confusing as the API is object oriented, calling a method on the object. I would expect the internal state of the device to be changing because of this. Either go fully functional or fully OO, but mixing them like this is causing confusion.

[lastmjs]

Actually, this gives incorrect results as well, I would expect the bleManager to be maintaining the global state of the device at all times:

console.log('await bleManager.isDeviceConnected(device.id)', await bleManager.isDeviceConnected(device.id)); // logs false
await device.connect();
console.log('await bleManager.isDeviceConnected(device.id)', await bleManager.isDeviceConnected(device.id)); //logs false

[radko93]

It happens because isConnected actually uses isDeviceConnected under the hood https://github.com/Polidea/react-native-ble-plx/blob/484501102ed87ba4004b8a128d86245018577117/src/Device.js#L141

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[federicomiralles]

This issue is still present on version 2.0.0. Everytime I try to check the status of a connected device by using isDeviceConnected it always returns false.
Please check the following code, despite of sending a connected device Id, I always get _Device AA:BB:CC:DD:EE:FF is NOT connected!_:

const isBleDeviceConnected = async (deviceId = null) => {
    if (!deviceId) return false;
    const isConnected = await bleManager.isDeviceConnected(deviceId);
    if (isConnected) {
      console.log(`Device ${deviceId} is connected!`);
    } else {
      console.log(`Device ${deviceId} is NOT connected!`);
    }
    return isConnected;
  };

Context: I need to check by using the built-in RN AppState component whether a device the user was using before switching of apps (or after coming back from background) it's still connected...

Is there any fix in progress or a workaround available?

Thanks in advance!

Federico

[ad-boschung]

It seems that this issue is still in the version 2.0.1. Any news about that ? @dariuszseweryn

[dariuszseweryn]

Current issue: #655