Mqtt Android PahoClient Connection Issue

Question

Hi I am using Android paho library for getting connect with an mqtt server.

My app level Gradle side Code :

implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.1.0'
implementation 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.1'

Project Level

allprojects {

    repositories {
        jcenter()
        maven {
            url "https://repo.eclipse.org/content/repositories/paho-snapshots/"
        }
        maven { url "https://jitpack.io" }
        maven {
            url "https://maven.google.com"
        }
    }
}

In Manifest File

<service android:name="org.eclipse.paho.android.service.MqttService" />

permisiions

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE" />

My issue is I am able to connect, publish data and subscribe to a topic when my server url is tcp://:1883

When I changed my url to mqtts://:8883 its failed to get connect

So what is the difference in the schemes tcp:// and mqtts:// or mqtt:// Why I am not able to connect if scheme starts with mqtt?

Please help!!!

Answer 1

tcp://hostname:1883 and mqtt://hostname:1883 are exactly the same.

mqtts://hostname:8883 is MQTT over TLS and will require that the broker has been correctly configured to support a TLS connection on port 8883.

Without details of the error when it fails to connect we can say nothing more.