[iOS] Scan - BleError: BluetoothLE is in unknown state

Prerequisites

• I am running the latest version
• I checked the documentation and found no answer
• I checked to make sure that this issue has not already been filed

Expected Behavior

When the BleState is PoweredOn, I should be able to startScanDevices() without having BleError: BluetoothLE is in unknown state. I should be able to scan devices with and without “Remote Debug” enabled.

Current Behavior

When I start scanning my devices, I receive the BleError: BluetoothLE is in unknown state even if I waited that the BleManager State was in ‘PoweredOn’. This behavior is only present when I enable the “Remote Debug” on iOS. It’s working fine if I’m disable the “Remote Debug”. It’s really annoying because everybody is developing with the Remote Debug active I guess… Otherwise it’s a bit complicated.

I don’t see anything about this issue in the documentation. It’s just written that we have to wait that the status is PoweredOnon iOS. And that’s done… I found that it’s not working with the “Remote Debug” active in this issue. I don’t understand why there is no related issue or documentation about that…

Steps to Reproduce

Please provide detailed steps for reproducing the issue.

1. Run your app
2. Activate Remote Debug
3. Wait until State is PoweredOn
4. Call startDevicesScan()
5. See error…

Context

• Library version: 2.0.1
• Platform: iOS.
• JS logs:

DeviceScanner.js:17 LIB : Wait until bluetooth ready...
DeviceScanner.js:28 Base state PoweredOn
DeviceScanner.js:57 LIB : Start scan...
DeviceScanner.js:70 Scan error :  {"message":"BluetoothLE is in unknown state","errorCode":103,"attErrorCode":null,"iosErrorCode":null,"androidErrorCode":null,"reason":null,"name":"BleError"}
DeviceScanner.js:85 LIB : Scan stopped
DeviceScanner.js:22 State change :  PoweredOn

• Formatted code sample or link to a repository:

App.js

 startScan() {
    _deviceScanner.startDevicesScan(
      error => {
        console.error(error);
        _deviceScanner.stopDevicesScan();
      },
      device => {
        console.log(device);
      }
    );
  };

DeviceScanner.js

  /**
   * Wait until Bluetooth is ready. On iOS the BLE stack is not immediately ready,
   * we need to wait for the "PoweredOn" status.
   */
  async waitUntilBluetoothReady() {
    let {PoweredOn, PoweredOff, Unauthorized, Unsupported} = State;
    console.log('LIB : Wait until bluetooth ready...');
    return new Promise(async (resolve, reject) => {
      this._bleManager.onStateChange(state => {
        console.log('State changed : ', state);
        if (state === PoweredOn) {
          resolve(true);
        }
      });

     // Verify if the state is already poweredOn before the listener was created
      let crtState = await this._bleManager.state();
      console.log('Base state', crtState);
      if (crtState === PoweredOn) {
        resolve(true);
      } 
      else if (
        crtState === PoweredOff ||
        crtState === Unauthorized ||
        crtState === Unsupported
      ) {
        reject(new Error('Bluetooth is not available :', crtState));
      }
    });
  }

  /** 
   * Start device scanning only if the BleManager State is ready 
   */
  async startDevicesScan(
    onError: (error: Error) => void,
    onDeviceFound: (device: ConnectHubDevice) => void,
  ) {
    this.waitUntilBluetoothReady()
      .then(() => {
        console.log('LIB : Start scan...');
        const scanOptions = {
          allowDuplicates: false,
          scanMode: ScanMode.LowLatency,
        };
        this._bleManager.startDeviceScan(
          [SERVICE_UUID],
          scanOptions,
          (error, device) => {
            if (error) {
              onError(error);
            }
            if (device) {
              onDeviceFound(device);
            }
          },
        );
      })
      .catch(error => console.log(JSON.stringify(error));
  }