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Introduction Situational awareness is essential in the operation of autonomous drones, with live video streaming being a key component in achieving situational awareness. In this guide, part of a series focused on building a 4G-connected autonomous drone, I detail a practical solution for setting up a live video stream from a drone to a Ground Control Station (GCS). This guide is particularly aimed at those who are looking to build custom drones using a Raspberry Pi as a companion computer....

You might have seen this example from The Java Tutorials. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 public class CopyBytes { public static void main(String[] args) throws IOException { FileInputStream in = null; FileOutputStream out = null; try { in = new FileInputStream("xanadu.txt"); out = new FileOutputStream("outagain.txt"); int c; while ((c = in.read()) !...

On a recent assignment, I needed to install npm behind a corporate proxy. I had already set the environment variables HTTP_PROXY and HTTPS_PROXY. Other command line utilities, like ruby gems, recognized these environment variables. Npm did not. After some googling, I found the following way to configure the proxy for npm. npm config set proxy http://proxy.company.com:8080 npm config set https-proxy http://proxy.company.com:8080 If you need to specify credentials, they can be passed in the url using the following syntax....

There are several ruby performance patches, like the falcon patches, that may improve the performace of your application. I use rvm and was pleased to learn that rvm supports compiling ruby with several of these performance patches. Using rvm with the railsexpress patch, I saw a 20% reduction in the time required to run the test suite for a large rails project. Here is how you can install ruby with the railexpress patch using rvm....

You will eventually get tired of looking at UTC timestamps in your server log files. https://help.ubuntu.com/community/UbuntuTime has a detailed guide for setting the time zone on your server and synchronizing it’s clock. Here are the commands I used to set my time zone and synchronize my clock on Ubuntu 12.04.1 LTS. Set time zone sudo dpkg-reconfigure tzdata Synchronize clock sudo apt-get install ntp