Concurrency on the Internet of Things (Arduino, MicroPython, Espruino)

In this presentation I talk about what concurrency actually is, why it matters for Internet of Things applications, and which platforms are best at handling it.

Always Secure Your localhost Servers

Recently I was surprised to learn that web browsers allow any site you visit to make requests to resources on localhost (and that they will happily allow unreported mixed-content ). If you'd like to test this out, run an HTTP server on port 8080 (for instance with python -m http.server 8080 ) and then visit this page. You should see "Found: HTTP (8080)" listed and that's because the Javascript on that page made an HTTP GET request to your local server to determine that it was running. Chances are it detected other services as well (for instance if you run Tor or Keybase locally). There are two implications from this that follow: Website owners could potentially use this to collect information about what popular services are running on your local network. Malicious actors could use this to exploit vulnerabilities in those services. Requests made this way are limited in certain ways since they're considered opaque , meaning that the web page isn't able...

Exploring Sub-GHz Radio With RTL-SDR and GQRX

Today I took a look at some hardware for working with sub-GHz radio transmissions, especially FM. All of which came in a previous HackerBoxes box. My favorite item was definitely the RTL-SDR dongle! I could play around with this thing for hours surfing the radio waves and listening to weird broadcasts. There's even a Python library named pyrtlsdr for working with these devices so you can scan/record radio transmissions programmatically: https://github.com/roger-/pyrtlsdr Next I'm going to solder together the FM transceivers included in the box and play around with writing Arduino firmware for them. Those things should work similar to the LoRa modules I've been using but they trade in the long range for increased bandwidth. Should be good for streaming data locally and still have much better range than most home WiFi or Bluetooth. Here's a video overview of the hardware included in HackerBox 0034 as well as a demo of the RTL-SDR dongle using GQRX to visually and...

WebGL terrain tutorial

Today I put together a quick tutorial on how to build a 3d terrain in Javascript, from setting up three.js to loading a heightmap and texture. More will be added later (controls and collision). Each step is organized as a release in the Github repo so you can download them all individually or browse through the commit diffs to see each change being made. The Github project is here: https://github.com/wybiral/terrain And, if course, there's a demo of it here: https://wybiral.github.io/terrain/

davy wybiral

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