The MQTT Android Service is an MQTT client library modified from https://github.com/eclipse/paho.mqtt.android because old library don't support Android 12. It hasn't updated in a long time.
- Download ZIP and Extract All
- Import library to your android project and select only mqtt folder
- Edit the build.gradle (app level) file like below.
dependencies {
...
implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.5'
implementation project(path: ':mqtt')
}
- See example project at https://github.com/ElectApp/MyMQTT/tree/master/app