Category Archives: programming

Building platform-aware docker images from a single Dockerfile on Gitlab CI/CD

Posted on 13/09/2018 by Eelco

In this post I will explain how to build and push images for different platforms using a single Dockerfile and how to create a multi-platform manifest that allows Docker client to automatically pull and run the correct image for the … Continue reading →

Posted in DevOps, programming | 1 Comment

Streaming audio between browsers with WebRTC and WebAudio

Posted on 24/07/2013 by Eelco

UPDATE (November 22, 2022): the demo page has moved from heroku to deno and is up and running again. As an experiment I wanted to try if it is possible to stream music files from one browser to another using … Continue reading →

Posted in programming, telecommunications, web | Tagged , , , , , , , | 17 Comments

XMPP Service Discovery extensions for M2M and IoT

Posted on 21/02/2013 by Eelco

Within the Webinos project we have investigated if we could use XMPP as the signalling protocol. Although it was decided by the Webinos project not to use XMPP in Webinos we believe we’ve made some interesting observations and solutions for … Continue reading →

Posted in domotica, internet of things, machine to machine, Networking, programming, protocols, telecommunications | Tagged , , , | 2 Comments

Installing a Storm cluster on CentOS hosts

Posted on 30/01/2013 by Jan Sipke

Storm is a distributed, realtime computation system to reliably process unbounded streams of data. The following picture shows how data is processed in Storm: This tutorial will show you how to install Storm on a cluster of CentOS hosts. A … Continue reading →

Posted in Cloud computing, programming | Tagged , , | Leave a comment

Installing Apache Libcloud on CentOS

Posted on 27/12/2012 by Jan Sipke

Apache Libcloud is a standard Python library that abstracts away differences among multiple cloud provider APIs. At the moment it can be used to manage four different kinds of cloud services: servers, storage, loadbalancers and DNS. Here are the steps … Continue reading →

Posted in Cloud computing, programming | Tagged , | 2 Comments

Building applications for health devices with Antidote and NodeJS

Posted on 18/12/2012 by Eelco

In this post I will explain how to build health apps that use Continua Health Alliance certified health devices with NodeJS. To communicate with these devices I am using the D-Bus health service from the open source Antidote IEEE 11073 stack … Continue reading →

Posted in programming | Tagged , , , , , , , , , | 5 Comments

Wirelessly control an Arduino with NodeJS over Bluetooth

Posted on 12/12/2012 by Eelco

I wanted to control my Arduino via Bluetooth using NodeJS but I could not find a Node module to do it. That is why I decided to build my own. This post describes how to use it. Arduino setup First, lets … Continue reading →

Posted in programming | Tagged , , , , , , , , , | 15 Comments

Creating a Java WebStart (JNLP) application

Posted on 15/10/2012 by Jan Sipke

Java WebStart, also called Java Network Launching Protocol (JNLP), allows you to launch Java applications directly from the internet using a webbrowser. In this article we will create a simple application and all configuration files necessary to launch it through … Continue reading →

Posted in programming | Tagged , , | Leave a comment

Creating network diagrams with D3.js

Posted on 25/09/2012 by Jan Sipke

D3.js is a JavaScript library for manipulating documents based on data. It can be used for all sorts of visualizations including network diagrams. In this article we will create a network diagram with nodes and directed links between them, visualized … Continue reading →

Posted in programming | Tagged , | Leave a comment

Welcome to Framework Limbo! Using Eclipse, Maven, GWT and Lombok

Posted on 14/05/2012 by Mark Bastiaans

One of the main advantages of service engineering in Java is that there are quite a lot of environments, libraries, frameworks, IDEs and plugins to choose from. That’s also a major drawback. We ran into this while doing a recent … Continue reading →

Posted in programming | Tagged , , , , , | 1 Comment