Discover method returns empty array for a bluetooth thermal printer

[sakshambhatt]

JS log:

App info:

1. RN version: 0.72.5
2. Android manifest

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

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

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

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

<uses-permission android:name="android.permission.BLUETOOTH_SCAN" android:usesPermissionFlags="neverForLocation"/>

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

3. build.gradle -> targetSdkVersion = 33
4. Discover method usage:

const discoverPrinterPress = async () => {
    try {
        const printers = await EscPosPrinter.discover();
        console.log({printers});
        if (printers[0]) {
            setPrinter(printers[0]);
        }
    } catch (e) {
        console.log('error while discovering printer', JSON.stringify(e));
    }
};

5. logcat for discover method: 

6. GitHub Link for further info

Android Phone info:

1. Name: SM-M315F/DS
2. Android version: 12

Printer info:

1. [Amazon link](https://www.amazon.in/Shreyans-Thermal-Receipt-Printer-Bluetooth/dp/B08NXTFY52)     
2. Processor architecture: I could not find

[sakshambhatt]

Possibly related issues:

1. Issue #50
2. Issue #78

Process I am following:

1. Switching on printer
2. Switching on bluetooth and location on the Android phone mentioned in the description above
3. Pairing the printer with phone with the 4 digit PIN
4. Opening the App and pressing on Discover printer button which triggers the discoverPrinterPress function mentioned in the description above.

Additionally, I have tried to print with this play store application and it is working. So, it is not that the printer is faulty. Perhaps I am missing something or there might be an issue with the library. It seems that the application mentioned above is using this library

[sakshambhatt]

Perhaps the issue might be that the printer is simply incompatible with this library.

I was able to print with react-native-thermal-printer which is an RN bridge of ESCPOS-ThermalPrinter-Android.

Unfortunately it won't work for iOS.