Unable to connect over IOT for minSDK version 19

🐛 Bug Report

My app is connected to AWS IoT using aws-android-sdk-core and aws-android-sdk-iot. I am using hivemq-mqtt-client for the client side. However, when using minSdkVersion lower than 26(in my case it is 19), I am unable to connect over IOT. It is working fine if set to minsdkversion 26

🔬 How To Reproduce

Steps to reproduce the behavior:

1 I have attached sample code to reproduce the issue

Code sample

(1) here is the gradle file

 plugins {
id("com.android.application")
id("org.jetbrains.kotlin.android")

// id ("com.google.gms.google-services") id ("kotlin-kapt") // id ("com.google.firebase.crashlytics") id("com.apollographql.apollo3") version "4.0.0-alpha.1" id("com.github.sgtsilvio.gradle.android-retrofix") version "0.5.0" }

android { namespace 'com.eprintitsaas.avision.app' compileSdk 33

defaultConfig {
    applicationId "com.eprintitsaas.avision.app"
    minSdk 19
    targetSdk 29
    versionCode 1
    versionName "1.0"
    multiDexEnabled true
    testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    configurations.all {
        resolutionStrategy {
            force 'androidx.preference:preference:1.1.1'
            force 'com.android.support:support-v4:25.1.1'
            exclude group: "com.android.support", module: "support-core-utils"
            exclude group: "com.android.support", module: "support-core-ui"
            exclude group: 'com.google.code.gson', module: 'gson'
        }
    }
}

buildTypes {
    release {
        minifyEnabled true
        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
}
compileOptions {
    // Support for Java 8 features

// coreLibraryDesugaringEnabled true sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } packagingOptions { resources { excludes += ['META-INF/INDEX.LIST', 'META-INF/io.netty.versions.properties'] } } kotlinOptions { jvmTarget = '1.8' } apollo { service("service") { packageName.set("com.eprintitsaas.avision.app") } } }

dependencies { implementation(files("libs/commons.jar")) implementation files('libs/WorkpathLib.aar') implementation files('libs/WorkpathLib-javadoc.jar')

implementation project(path: ':aws-android-sdk-core')
implementation project(path: ':aws-android-sdk-iot')

//Old before updating to api level 16

// implementation 'androidx.core:core-ktx:1.11.0-beta02' // implementation 'androidx.appcompat:appcompat:1.6.1' // implementation 'com.google.android.material:material:1.9.0'

//to support api level 16
implementation 'androidx.core:core-ktx:1.7.0'
implementation 'androidx.appcompat:appcompat:1.4.1'
implementation 'com.google.android.material:material:1.5.0'

implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.6.2")

//firebase
implementation(platform("com.google.firebase:firebase-bom:32.3.1"))
implementation("com.google.firebase:firebase-crashlytics-ktx")
implementation("com.google.firebase:firebase-analytics-ktx")

/*RETROFIT 2.9.0*/
implementation("com.squareup.retrofit2:retrofit:2.9.0")
implementation("com.squareup.retrofit2:converter-gson:2.9.0")
implementation("com.squareup.okhttp3:logging-interceptor:5.0.0-alpha.2")

// implementation("com.squareup.okhttp3:logging-interceptor:3.0.0-RC1") // implementation ("com.squareup.okhttp3:okhttp:4.9.1"){ // force = true //API 19 support // } implementation("com.squareup.retrofit2:converter-scalars:2.6.4")

// implementation ("com.squareup.okhttp3:okhttp:3.12.13"){ // force = true //API 19 support // }

//butter knife
implementation("com.jakewharton:butterknife:10.2.3")
kapt ("com.jakewharton:butterknife-compiler:10.2.3")

//swipe to refresh
implementation("androidx.swiperefreshlayout:swiperefreshlayout:1.1.0")

implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.1")
implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.7.1")

//apollo
implementation("com.apollographql.apollo3:apollo-runtime:4.0.0-alpha.1")
implementation("com.apollographql.apollo:apollo-coroutines-support:2.5.14")

//change svg image color
implementation("com.github.devsideal:VectorChildFinder:1.0.0")

//multidex
implementation("androidx.multidex:multidex:2.0.1")

implementation ("androidx.appcompat:appcompat:1.6.1")
implementation ("com.google.android.material:material:1.9.0")
implementation ("androidx.constraintlayout:constraintlayout:2.1.4")

//noinspection GradleCompatible
implementation ("com.android.support:support-core-utils:28.0.0")

//dropbox
implementation ("com.dropbox.core:dropbox-core-sdk:3.1.5")

//gson
implementation ("com.google.code.gson:gson:2.10.1")

implementation(platform("org.jetbrains.kotlin:kotlin-bom:1.8.0"))
implementation ("com.intuit.sdp:sdp-android:1.1.0")
implementation 'org.bouncycastle:bcpkix-jdk15on:1.67'
implementation "org.minidns:minidns-hla:0.3.2"

implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.5'
implementation 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.1'
implementation 'androidx.preference:preference:1.1.1'

implementation 'com.github.bumptech.glide:glide:4.15.1'
implementation 'com.github.chrisbanes:PhotoView:2.3.0'

// implementation 'com.amazonaws:aws-android-sdk-iot:2.73.0' // implementation 'com.amazonaws:aws-android-sdk-core:2.73.0'

// coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.2.3' // coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.8' // implementation 'org.conscrypt:conscrypt-android:2.5.2'

retrofix("net.sourceforge.streamsupport:android-retrostreams:1.7.4") // for backporting streams
retrofix("net.sourceforge.streamsupport:android-retrofuture:1.7.4") // for backporting future
retrofix("org.threeten:threetenbp:1.6.5") // for backporting time

implementation 'com.hivemq:hivemq-mqtt-client:1.3.0'

}

(2) client code to connect over IOT

fun createClient(
        clientKey: String,
        clientId: String,
        brokerUrl: String,
        privateKey: String
    ): Mqtt5AsyncClient? {
        val keyManagerFactory: KeyManagerFactory = createKeyManagerFactory(privateKey)
        val trustManagerFactory: TrustManagerFactory = createTrustManagerFactory(clientKey)
        return MqttClient.builder()
            .useMqttVersion5()
            .identifier(clientId)
            .serverHost(brokerUrl)
            .serverPort(443)
            .sslConfig().protocols(Arrays.asList("TLSv1.2"))
            .keyManagerFactory(keyManagerFactory)
            .trustManagerFactory(trustManagerFactory)
            .applySslConfig()
            .buildAsync()
    }

    fun createKeyManagerFactory(privateKey: String): KeyManagerFactory {
        try {
            val keyStoreTemp = keystore

// val keyInputStream = ByteArrayInputStream(privateKey.toByteArray()) // keyStoreTemp.load(keyInputStream, null) val keyManagerFactory: KeyManagerFactory = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm()) keyManagerFactory.init(keyStoreTemp,"password".toCharArray()) return keyManagerFactory } catch (e: java.lang.Exception) { e.printStackTrace() throw IllegalArgumentException( "Failed to create KeyManagerFactory for MQTT Client connection.", e ) } }

    fun createTrustManagerFactory(certificate: String): TrustManagerFactory {
        try {
            val keyStoreTemp = keystore

// val certInputStream = ByteArrayInputStream(certificate.toByteArray()) // keyStore.load(certInputStream, null) val trustManagerFactory: TrustManagerFactory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm()) trustManagerFactory.init(keyStoreTemp) return trustManagerFactory } catch (e: java.lang.Exception) { e.printStackTrace() throw IllegalArgumentException( "Failed to create TrustManagerFactory for MQTT Client connection.", e ) } }

Environment

Where are you running/using this client?

Android studio emulator Nexus 5 API 19

What version of this client are you using?

implementation 'com.hivemq:hivemq-mqtt-client:1.3.0'

JVM version? compileOptions { // Support for Java 8 features // coreLibraryDesugaringEnabled true sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } Operating System? Android kitkat 4.4 MAC os Which MQTT protocol version is being used? Mqtt5AsyncClient Which MQTT broker (name and version)? Please check gradle code and client code

Screenshots

hivemq / hivemq-mqtt-client