Ubuntu

Up to now, this article has covered XMPP and its usages. It is a good, mature protocol with multiple servers developed around it. Sometimes, however, you may need to set up a quick application that uses a simple message transfer, or develop a small chat application for your team. For such projects, XMPP servers may turn out to be overkill. You may not use all the features of XMPP and waste resources, even for a basic setup. Plus, developing an XMPP application is a time consuming process.

In this recipe, we will learn how to set up and use the group chat feature of XMPP. Group chat is also called Multi User Chat (MUC). Ejabberd supports MUC with the help of an extension and is enabled by default.

Getting ready

You will need the Ejabberd server set up and running. Make sure you have enabled MUC with the mod_muc and mod_muc_admin modules.

You will need two users for the group chat. One of them needs to have admin rights to set up MUC and create rooms.

Ejabberd comes with various default settings that make it easy to get started. We can install Ejabberd and start using it as soon as installation completes. This works when we are testing our setup, but when we need a production server, we need to make a number of changes to the default installation. Ejabberd provides a central configuration file through which we can easily configure our XMPP installation.

This recipe covers the basic configuration of the Ejabberd server.

Getting ready

Make sure that you have installed the Ejabberd server.

We have installed the XMPP server, Ejabberd. In this recipe, we will learn how to add new user accounts to the Ejabberd server. We will also learn how to configure the XMPP client and connect to our server.

Getting ready

Make sure that you have installed the Ejabberd server and it is running properly.

Additionally, you will need XMPP client software. You can choose from multiple free and open source clients such as pidgin, PSI, Adium, Gajim, and many more. I will be using PSI as it provides various low-level administrative features.

In this recipe, we will learn how to install the Ejabberd XMPP server. We will be using an integrated installation package that is available from the Ejabberd download site. You can also install Ejabberd from the Ubuntu package repository, but that will give you an older, and probably outdated, version.

Getting ready

You will need an Ubuntu server with root access or an account with sudo privileges.

How to do it…

The following are the steps to install Ejabberd:

Extensible Messaging and Presence Protocol (XMPP) is a communication protocol that provides near-real-time message passing between two or more entities. XMPP is based on XML and transfers data in predefined formats that are known to server as well as client systems. Being an XML-based protocol, you can easily extend XMPP to suit your requirements. It also provides various standard extensions to extend the base functionality of the XMPP server.

In this article, we will cover the following recipes:

• Installing Ejabberd
• Creating users and connecting with the XMPP client
• Configuring the Ejabberd installation
• Creating web client with Strophe.js
• Enabling group chat
• Chat server with Node.js

We have set up the Ampache server and configured it for streaming. In this recipe, we will learn how to set up an Android client to play content from our Ampache server.

Getting ready

You will need an Android or iOS phone or tablet. We will focus on the configuration of an Android client, but the same configuration should work with an iOS device, and even desktop clients such as VLC.

How to do it…

Follow these steps to stream music with Ampache:

A streaming client needs to get the details of the media available on the streaming server. The client needs to authenticate with server access the catalog and list of songs and even request offline access to store media locally. With Ampache, we can use its REST and XML APIs. Through these APIs, clients can communicate with Ampache. You can even write your own client tool using any of the supported APIs.

Transcoding means converting media from one format to another. Suppose your music files are in a format different to MP3 and your media player only understands MP3 format. In that case, you need to convert your music files to MP3. This conversion task is done by transcoder programs. There are various transcoding programs available, such as ffmpeg and avconv. These programs need codec before they can convert media from source format to destination format. We need to separately install and configure these components.