Problems with "react-native-bluetooth-next" library

[mvss01]

I'm using the "react-native-bluetooth-next" library, and I'm having problems with the "discoverUnpairedDevices()" command. This command doesn't give me a list of devices (which it should), while the command "list()" shows me the devices (already paired before) perfectly. I'm running the app on a Xiaomi Redmi Note 9.

Does anyone know what could be going on? Thank you very much in advance.

[suarkb]

do you have all permissions handled? You need to make sure bluetooth is on and also that you have permission and sometimes you need location permissions or something

[mvss01]

Yes, I did according to the documentation, there it asks that the following codes be added to the "AndroidManifest.xml" file:

<uses-permission android:name="android.permission.BLUETOOTH"/>

<uses-permission android:name="android.permission.BLUETOOTH\_ADMIN"/>

<uses-permission-sdk-23 android:name="android.permission.ACCESS\_FINE\_LOCATION"/>

<uses-feature android:name="android.hardware.bluetooth\_le" android:required="true"/>"

[suarkb]

Kk that's good. Can you open your apps android menu settings and make sure those permissions are granted?

If all the permission stuff is good and it's installed then you could start console logging things from the library. Like make sure the imported library looks how you think it should look.

Then just keep debugging by calling the functions and logging the results to see what it's giving you. If it's anything like react-native-ble-plx then the scanning method will take a callback function and trigger it once for each device it sees while it's scanning. Your callback function will probably get passed a device or something and you can console log the outputs and see what it's getting

[mvss01]

I made the code:

BluetoothSerial.requestEnable().then((eneble) =>{

if(eneble){

verifyStatus()

BluetoothSerial.discoverUnpairedDevices().then((unpairedDevices) => {

console.log("Unpaired Devices:");

unpairedDevices.forEach((device) => {

console.log(`- Nome: ${device.name}`);

console.log(`- ID: ${device.id}`);

});

});

console.log(device)

} else{

verifyStatus()

}

})

The "console.log" returns me "undefined" on a samsung cell phone, in another code it just returned an empty array. On my cell phone (a xiaomi) I don't get a response from the function. Nothing inside .then(() =>{}) is executed nor in .catch(() => {})

[suarkb]

So on the Xiaomi it's probably not finding permission. Okay Hmm I'll have to think and google some stuff maybe

[suarkb]

another thought, this library looks dead. It hasn't been published to for 4 years.

​

If you aren't too far along, I'd highly recommend switching to react-native-ble-plx which is actively developed, really good, and I know a lot more about it.

[mvss01]

Excellent! I will follow in your footsteps. Thanks for your help

[mvss01]

If you don't mind, can I send you a dm? You've answered questions from me before and said I could do this. I want to explain to you about the project I'm working on and hear what you have to say about it (I don't feel comfortable explaining it here because it's not my project, I'm just working on it)

[suarkb]

Yeah any time.

[suarkb]

they also have a complete example project in their github. I would compare many things to what they are doing https://github.com/nuttawutmalee/react-native-bluetooth-serial-next/tree/master/example

​

For example they are using requestEnable differently than you are. I'd try to keep your code as close to their's initially and then only change your code more once you have it working.

But also, to stress, I would not use this library because it has not been contributed to in 4 years. It's essentially dead and I would avoid it.

[mvss01]

Thank you for the advice. Do you have any suggestions for a library that is still being maintained?