### Get Server Certificate

Source: https://github.com/hannesa2/paho.mqtt.android/blob/master/serviceLibrary/src/androidTest/assets/updatingCertificates.md

Use this command to fetch the SSL certificate from an MQTT broker. Ensure you capture all certificates in the chain by copying each one to a separate .crt file.

```bash
echo -n | openssl s_client -connect broker.hivemq.com:8883 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > eclipse.crt
```

--------------------------------

### Initialize MqttAndroidClient with Foreground Service (v3.x)

Source: https://github.com/hannesa2/paho.mqtt.android/blob/master/README.md

For version 3.x on Android O and above, initialize the `MqttAndroidClient` and set up a foreground service with a notification.

```kotlin
val client = MqttAndroidClient(context, uri, clientId).apply {
    setForegroundService(foregroundNotification, 3)
}
```

--------------------------------

### Import Certificate to BKS Keystore

Source: https://github.com/hannesa2/paho.mqtt.android/blob/master/serviceLibrary/src/androidTest/assets/updatingCertificates.md

Import the obtained certificate into a BKS keystore. This command requires the BouncyCastle provider and its JAR file. Replace 'test.bks' and 'mqtttest' with your desired keystore name and password.

```bash
keytool -importcert -v -trustcacerts -file eclipse.crt -alias broker.hivemq.com -keystore "test.bks" -provider org.bouncycastle.jce.provider.BouncyCastleProvider -providerpath "./bcprov-jdk15on-1.65.jar" -storetype BKS -storepass mqtttest
```

--------------------------------

### List Certificates in BKS Keystore

Source: https://github.com/hannesa2/paho.mqtt.android/blob/master/serviceLibrary/src/androidTest/assets/updatingCertificates.md

Verify the contents of your BKS keystore by listing all imported certificates. This command also requires the BouncyCastle provider and its JAR file.

```bash
keytool -list -v -keystore test.bks -provider org.bouncycastle.jce.provider.BouncyCastleProvider -providerpath "./bcprov-jdk15on-1.65.jar" -storetype BKS -storepass mqtttest
```

--------------------------------

### Add Library Dependency

Source: https://github.com/hannesa2/paho.mqtt.android/blob/master/README.md

Add the MQTT Android client library as a dependency in your app's `build.gradle` file.

```gradle
dependencies {
  implementation "com.github.hannesa2:paho.mqtt.android:$latestVersion"
}
```

--------------------------------

### Add Jitpack Repository

Source: https://github.com/hannesa2/paho.mqtt.android/blob/master/README.md

Include the Jitpack repository in your project's `allprojects` block to use the library.

```gradle
allprojects {
  repositories {
    ... 
    maven { url 'https://jitpack.io' }
  }
}
```

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