Thermal printer android issue

[Sreeshks]

I'm using Flutter 3.29.3 and JDK 23 to build an Android POS application. I'm trying to connect to a Bluetooth device, but the connection fails. The error message indicates that permissions are granted, and I have already added the necessary permissions in the AndroidManifest.xml file. Why is the Bluetooth device not connecting?

<uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADVERTISE" />
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.BLUETOOTH_SCAN"/>
<uses-permission android:name="android.permission.BLUETOOTH_CONNECT"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

android/build.gradle

plugins {
id "com.android.application"
id "kotlin-android"
// The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
id "dev.flutter.flutter-gradle-plugin"
}

def localProperties = new Properties()
def localPropertiesFile = rootProject.file("local.properties")
if (localPropertiesFile.exists()) {
localPropertiesFile.withReader("UTF-8") { reader ->
localProperties.load(reader)
}
}

def flutterVersionCode = localProperties.getProperty("flutter.versionCode")
if (flutterVersionCode == null) {
flutterVersionCode = "1"
}

def flutterVersionName = localProperties.getProperty("flutter.versionName")
if (flutterVersionName == null) {
flutterVersionName = "1.0"
}

android {
namespace = "com.example.equal_pos_app"
compileSdk = 35
ndkVersion = "25.1.8937393"
buildFeatures {
buildConfig = true
}
compileOptions {
sourceCompatibility = JavaVersion.VERSION_1_8
targetCompatibility = JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = JavaVersion.VERSION_1_8
}
defaultConfig {
// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
applicationId = "com.example.equal_pos_app"
// You can update the following values to match your application needs.
// For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
minSdk = 22
// targetSdk = 34
multiDexEnabled true
versionCode = flutterVersionCode.toInteger()
versionName = flutterVersionName
// minifyEnabled true
//shrinkResources true
targetSdk = 34

}

buildTypes {
    release {
        // TODO: Add your own signing config for the release build.
        // Signing with the debug keys for now, so `flutter run --release` works.
        signingConfig = signingConfigs.debug
        minifyEnabled true

        // Enables resource shrinking, which is performed by the
        // Android Gradle plugin.
        shrinkResources true
    }
}

}

flutter {
source = "../.."
}

dependencies {
implementation 'androidx.core:core:1.15.0'
implementation 'androidx.activity:activity-ktx:1.9.3'
implementation 'com.google.android.gms:play-services-instantapps:18.1.0'
implementation "androidx.activity:activity:1.9.3"
}