No callback to listen for turn on of bluetooth after calling BluetoothManager.enableBluetooth()

[januslo]

No callback to listen for turn on of bluetooth after calling BluetoothManager.enableBluetooth()

[januslo]

I am not sure how to listen the BLE Off event, any idea of that? I are checking BLE status where It need to ensure BLE enabled, Like scanning and printing. 发自我的 iPhone

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在 2018年12月20日，下午3:19，Shubham Choudhary ***@***.***> 写道： I am running this method BluetoothManager.enableBluetooth() from componentDidMount if bluetooth enabled is false, It works fine.but, once prompt to turn bluetooth showsup and user turns on bluetooth, there is no callback which gets triggered. even code in then block of BluetoothManager.enableBluetooth() doesn't work — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub, or mute the thread.

[shubhamdeol]

okay, just the way you are checking Bluetooth status, can you also check connected status, whether a pos device is connected to Bluetooth or not. I am having command not found warning lot of times.

and regarding this issue, You should have some callback, which can be executed from the app once user turns Bluetooth on

[shubhamdeol]

@januslo If I am running scanDevices function, more than one time, it falls in catch block, How did you handled connectivity issues can you please provide me some example

[januslo]

First, plz dot let use scan twice, second, what error shows while trigger scan twice? 发自我的 iPhone

…

在 2018年12月20日，下午5:48，Shubham Choudhary ***@***.***> 写道： @januslo If I am running scanDevices function, more than one time, it falls in catch block, How did you handled connectivity issues can you please provide me some example — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.

[shubhamdeol]

@januslo can you please let me know how to connect to printer using this package. I am facing problems. Sometimes it doesn't show my device in paired devices array even if the device is paired. then I need to restart the app and turn bluetooth on/off it sharts showing

[januslo]

marry Eve, plz try more about the bluetoothManager, the relates operations should be included in it.
You may try to listen the event rather then using the method returns, I am sorry I need to do more testing about the method returns later.

 DeviceEventEmitter.addListener(
            BluetoothManager.EVENT_DEVICE_ALREADY_PAIRED, (rsp)=> {
                this._deviceAlreadPaired(rsp) // rsp.devices would returns the paired devices array in JSON string.
            });
        DeviceEventEmitter.addListener(
            BluetoothManager.EVENT_DEVICE_FOUND, (rsp)=> {
                this._deviceFoundEvent(rsp) // rsp.devices would returns the found device object in JSON string
            });

[shubhamdeol]

okay, thanks. This thing can be solved now. Can I connect to device more than once. I mean if a device is connected can I connect to it again.

or to avoid this, how can I know which device is connected to the printer at the current moment.

sometimes I am getting this error Error: Unable connect device, when I try to reconnect to the paired device

[januslo]

Actually, we suffer the same thing, In the last commit, I update the android connect mechanism that would check the current connect and return the connected device name directly. In one word, plz update the repo to the last one (with git url directly current, will publish a new version after this mechanism is applied and tested in IOS as well) and you can just call connect() once again.

[shubhamdeol]

I tried adding these methods also, but getting these functions as undefined :(
can you fix this: here is the code

`

@ReactMethod
public void isDeviceConnected(Callback booleanCallback) {

    Boolean isConnected = true;

    if (mService != null) {
        switch (mService.getState()) {
            case 0:
                isConnected = false;
                break;

            case 2:
                isConnected = false;
                break;

            case 3:
                isConnected = true;
                break;

            default:
                isConnected = false;
                break;
        }
    }
    booleanCallback.invoke(isConnected);
}



/* Return the address of the currently connected device */
@ReactMethod
public void getConnectedDeviceAddress(final Promise promise) {
    if (mService!=null){
        promise.resolve(mService.getLastConnectedDeviceAddress());
    }

}`

[januslo]

plz make sure your code was installed into node_module folder.

[shubhamdeol]

Now, I finally I am able to connect to pos printer flawlessly, Thanks for your help. Will give you a pull request soon, I have added both of these methods, which makes the connection with pos easier.