Skip to main content

Ejabberd VS Openfire VS "handmade"

This month, I have a project from my laboratory about Smart Gateway. What smart gateway is it? It's a smart gateway system that allows multi-client chat not only using the internet but also SMS. Does it seem weird? Yeah, it will be used for rural areas where it is difficult to get internet access but still has SMS service. In this project, I take part in internet module development.
There must be a server that can serve some users. There are some applications that can be installed on the server to build a chat server. Firstly, I chose Ejabberd. The installation process for this application was so long. I installed it from its source code. This program was made by Erlang programming language. That's a new thing for me. I should install Erlang's compiler. I found the wrong site that gave difficult steps and I followed that difficult steps to install Erlang's compiler until I got stuck. Then, I found out that the Ubuntu repository provides it. After that, I installed Ejabberd, built some configurations, and ran it. To make this server can be accessed by clients, it needs a client application that can be installed either on the server or clients. I chose JWChat, installed it on a server, and built some configurations so this application could communicate with Ejabberd. Clients can make a chat conference by accessing a web application that is on the server from a browser. OK, that was the beginning. The main point of a smart gateway chat server is to store internet chat data into a common database server like MySql which will be used by Gammu to store SMS messages.  I also have to build a program that can make all data from the internet and SMS can be synchronized. Ejabberd uses the Mnesia database, a built-in database from Ejabberd. Then, I made some configurations again for Ejabberd so it can store chat data to MySql. After spending a day I tried to fix its configuration, the Ejabberd server still didn't want to work. It failed to start. I think the problem is on connection to MySql because when I used the internal database, it ran normally. I read the installation guide and configuration file carefully but couldn't find any mistakes. Then, I thought to move to another application to build the server.
Openfire is another application to build a chat server. It uses Java programming language. I think that was great. I have always liked Java. The developer website for this application also looks better than the Ejabberd site. I feel that the Openfire installation process was easier than Ejabberd. To configure the server, we can use a web-based control panel that is provided by Openfire. Database configuration also can be done from that control panel. Openfire has provided a MySql driver for Openfire so we don't have to install it separately. For server testing, I used a client-side application. It's Spark, also from the Openfire site. It worked nicely. After that, I must think again about how to manage the database, update the source code of Openfire to support the Smart Gateway system, and build a more simple application for client. Openfire is a more complex application than Ejabberd which use Java and many modules on it.
After three days of doing this work, I start to think of better solutions to finish this project as soon as possible. I think, If I make my own server application using Java, it will be more simple and can produce results as needed.


Popular posts from this blog

Rangkaian Sensor Infrared dengan Photo Dioda

Keunggulan photodioda dibandingkan LDR adalah photodioda lebih tidak rentan terhadap noise karena hanya menerima sinar infrared, sedangkan LDR menerima seluruh cahaya yang ada termasuk infrared. Rangkaian yang akan kita gunakan adalah seperti gambar di bawah ini. Pada saat intensitas Infrared yang diterima Photodiode besar maka tahanan Photodiode menjadi kecil, sedangkan jika intensitas Infrared yang diterima Photodiode kecil maka tahanan yang dimiliki photodiode besar. Jika  tahanan photodiode kecil  maka tegangan  V- akan kecil . Misal tahanan photodiode mengecil menjadi 10kOhm. Maka dengan teorema pembagi tegangan: V- = Rrx/(Rrx + R2) x Vcc V- = 10 / (10+10) x Vcc V- = (1/2) x 5 Volt V- = 2.5 Volt Sedangkan jika  tahanan photodiode besar  maka tegangan  V- akan besar  (mendekati nilai Vcc). Misal tahanan photodiode menjadi 150kOhm. Maka dengan teorema pembagi tegangan: V- = Rrx/(Rrx + R2) x Vcc V- = 150 / (150+10) x Vcc V- = (150/160) x 5

Setting Up Next.js Project With ESLint, Typescript, and AirBnB Configuration

If we initiate a Next.js project using the  create-next-app tool, our project will be included with ESLint configuration that we can apply using yarn run lint . By default, the tool installs eslint-config-next and extends next/core-web-vitals in the ESLint configuration. The Next.js configuration has been integrated with linting rules for React and several other libraries and tools. yarn create next-app --typescript For additional configuration such as AirBnB, it is also possible. First, we need to install the peer dependencies of eslint-config-airbnb . We also add support for Typescript using eslint-config-airbnb-typescript . yarn add --dev eslint-config-airbnb eslint-plugin-import eslint-plugin-jsx-a11y eslint-plugin-react eslint-plugin-react-hooks yarn add --dev eslint-config-airbnb-typescript @typescript-eslint/eslint-plugin @typescript-eslint/parser After that, we can update the .eslintrc.json file for the new configuration. { "extends": [ "airb

Configuring Swap Memory on Ubuntu Using Ansible

If we maintain a Linux machine with a low memory capacity while we are required to run an application with high memory consumption, enabling swap memory is an option. Ansible can be utilized as a helper tool to automate the creation of swap memory. A swap file can be allocated in the available storage of the machine. The swap file then can be assigned as a swap memory. Firstly, we should prepare the inventory file. The following snippet is an example, you must provide your own configuration. [server] [server:vars] ansible_user=root ansible_ssh_private_key_file=~/.ssh/id_rsa Secondly, we need to prepare the task file that contains not only the tasks but also some variables and connection information. For instance, we set /swapfile  as the name of our swap file. We also set the swap memory size to 2GB and the swappiness level to 60. - hosts: server become: true vars: swap_vars: size: 2G swappiness: 60 For simplicity, we only check the exi

Raspberry Pi Bluetooth Connection

Raspberry Pi 3 provides a built-in Bluetooth module. The latest Raspbian has been bundled with tools for enabling Bluetooth connection. The Bluetooth icon will be shown up on the top right corner of the desktop. It's a tool to discover available Bluetooth devices and connect Pi with Bluetooth devices. It is easy to connect any Bluetooth-enabled electronic device with Pi. But, sometimes Pi will fail to connect, especially for Bluetooth device that has no standardized services. From a terminal, we can use the  bluetoothctl tool to scan and connect with a Bluetooth device. You should make sure that the BlueZ protocol stack has been installed by running $ apt-get install bluez Run bluetoothctl to enter the tool command window Turn the power on by running power on (Optional) You can set AutoEnable=true in /etc/bluetooth/main.conf if you want to make the Bluetooth auto power-on after reboot. Run devices to see which devices have been paired Run scan on if your desired d

Installing Multiple Instances of Linux Distributions in WSL

By support of WSL (Windows Subsystem for Linux), you can install any Linux distros in a Windows machine. Recommended method from WSL documentation is by downloading the distribution from Microsoft Store or find .appx installation file available in Microsoft website. For running multiple instances of same Linux distribution, you can duplicate the data using export-import procedure, as I have mentioned in another post . Another method that might be more beneficial is by utilizing Docker. Currently, Docker has already had variety of images of Linux distributions in its registry. You can also store your own costumized distribution in Docker registry that can be distributed to any machines instantly. After you had WSL 2 and an installed Linux distribution from Microsoft Store, you are ready to have more Linux instances in your Windows. 1. List all installed distributions in your Windows. wsl --list -v 2. Run the distribution you desired from terminal, for example, you have insta

Generate API Documentation Using Swagger Module in NestJS

Swagger provides us a standard to generate API documentation based on the Open API specification. If we use NestJS for building our API providers, we can utilize a tool provided by NestJS in the  @nestjs/swagger  module to generate the documentation automatically in the built time. This module also requires the swagger-ui-express module if we use Express as the NestJS base HTTP handler. Set Swagger configuration First, we need to define Swagger options and instantiate the documentation provider on the main.ts file. import { DocumentBuilder, SwaggerModule } from '@nestjs/swagger'; // sample application instance const app = await NestFactory.create(AppModule); // setup Swagger options const options = new DocumentBuilder() .setTitle('Coffee') .setVersion('1.0') .setDescription('Learn NestJS with coffee') .build(); // build the document const document = SwaggerModule.createDocument(app, options); // provide an endpoint