Failed to resolve: org.eclipse.paho:org.eclipse.paho.android.service:1.1.5

This error message indicates that Gradle is unable to locate the dependency "org.eclipse.paho.android.service" version 1.1.5 in any of the available repositories.

To resolve this issue, you can try the following steps:

1. Check if you have added the correct repository in your project's build.gradle file. For example:

repositories {
    maven {
        url "https://repo.eclipse.org/content/repositories/paho-releases/"
    }
}

2. Make sure you have included the correct dependency in your module's build.gradle file. For example:

dependencies {
    implementation 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.5'
}

3. If the above steps do not work, try updating the version number of the dependency to the latest available version. You can check the latest version on the Paho MQTT Android Client GitHub page.

4. If none of the above steps help, try refreshing your Gradle dependencies by selecting "File" > "Invalidate Caches / Restart" in Android Studio.

If the issue still persists, you can try contacting the Paho MQTT Android Client community forums or GitHub page for further assistance.