Rpi rt kernel tittle min

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#Raspberry Pi: Preempt-RT Kernel 4.14.y on Raspberry Pi

  Preempt-RT   Patched Linux   Raspberry Pi   Kernel 4.14.y

The forked rpi-4.14.y-rt repo by TiejunChina is now a branch under the official Raspberry Pi repo. That means you need to type the following to clone the Preempt-RT patched Kernel

~/rpi-kernel$ git clone https://github.com/raspberrypi/linux.git
~/rpi-kernel$ cd linux
~/rpi-kernel/linux/ git checkout rpi-4.14.y-rt

Then, you can follow the tutorial from here.

RPI Zero Preempt-RT

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#Raspberry PI Zero W: Preempt-RT Kernel Performance (updated: 18.03.2018)

  Raspberry PI Zero   Preempt-RT   Kernel Patching

Today I patched the kernel of a Raspberry Pi Zero W with Preempt-RT. I used the repo TiejunChina.

Update 18.03.2018: The official Preempt-RT patched Rasbian repo is here.

~/rpi-kernel$ git clone https://github.com/TiejunChina/linux.git # update 18.03.2018: old repository
~/rpi-kernel$ git clone https://github.com/raspberrypi/linux.git # update 18.03.2018: new repository
~/rpi-kernel$ cd linux
~/rpi-kernel/linux$ git checkout rpi-4.14.y-rt  # today the kernel version is 4.14.22
                                                # with rt17 resulting in 4.14.22-rt17+

You can find a complete tutorial for patching a Raspbian kernel 4.14.y here.

Check the options for Raspberry Model A(+), B(+), Zero W.

(perfomance tests and problems inside!)

Wemos & MicroPython

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#Tutorial: Installing dependencies on MicroPython

  MicroPython   Wemos   WiPy   ESP8266

While I was reading my getting stated tutorial about MicroPython again, I noticed that I've forgotten to tell something about dependencies or packages.

Here is possible to find some MicroPython packages. On the WeMos or the ESP8266, it is possible to install these packages using the upip package manager. The WiPy doesn't have the package.

RPI RT Preempt Kernel Performance

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#Raspberry Pi: Preempt-RT vs. Standard Kernel 4.14.y

  Raspberry Pi   Real Time Systems   Preempt-RT   Kernel Patching   Real-Time Linux

The last week I was working on a real-time application (with a 1 ms sample time) that runs on an ARMv8 Cortex-A53 (Raspberry Pi 3 Model B based board) and I was wondering the differences between latencies on the standard and the Real-Time (RT) Linux kernel. I had some problems with the standard kernel version, then I thought I could analyze the latencies of both kernels, and make some conclusions. Many test are available but with older kernel versions. The tests were performed using the Raspbian Kernel 4.14.21 and the RT-Preempt Patch 4.14.21-rt17!

RPI RT Preempt Kernel

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#Raspberry Pi: Preempt-RT Patching Tutorial for Kernel 4.14.y (updated: 18.03.2018)

  Raspberry Pi   Real Time Systems   Preempt-RT   Kernel Patching   Real-Time Linux   Tutorial

There are a lot of tutorials for Raspberry Pi kernel patching using RT-Preempt, but I needed about 15 hours to get it working! I hate Kernel patching! and I have to say, that's not my first time. I have a system working with Ubuntu, RTAI and an Ethercat master. I patched the system more than once. But it is/was always a new thing! and It costs a lot of time! ;)

Then, you have another tutorial here! I only hope that the repo gets official. It could reduce the time to get the RT kernel working, if it is kept updated.

Update: 18.03.2018: The repository is now here! It is a branch from the official Raspberry Pi kernel repository.


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#Photo Gallery: Melbourne

  Melbourne, Photos, Gallery, Victoria, Australia
As I promised some photos of Melbourne (Australia). Bangkok photos are coming this week. I don't know if you noticed, but I added two new repositories to GitHub: Both repositories are extensions for PageKit. The first one allows you to add Google Adsense ads to the posts. The second one extends the PageKit blog plugin to add categories and tags to the blog posts. I was/am quite busy these weeks, but I am writing the README files. I need to check them again. Enjoy the photos!

Happy New Year!

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Happy New Year!

  happy new year   2018

Out with the old, in with the new! Happy 2018!

This time something without electronics. I took the title photo! You should read "Happy New Year" ;). Thanks to my brother who wrote it in the air! Nice!

As you may notice, I use his music on the videos. If you want to hear more great music, here you find the links:

Wipy2.0 Xmas-lights

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#Micropython: Merry Xmas & Happy New Year!

  wipy   python   micropython   ws2812b   leds

It has been a while since my last post! Sorry, I was a little bit busy and then I was on a business trip in Melbourne for the CDC2017 and then I had a week holiday in Bangkok. I will be posting some photos on the next days!

It's been a year now since I started this blog. It's a hard job to maintain it up-to-date but I still have fun writing and coding for this purpose! So let us start!

The first video that I published a year ago was using the Wipy2.0 and a WS2812b led strip for some Christmas lights (click here). Now, this time I bought a WS2812b panel (100 bits or 10x10 pixels -or leds- see fig. 1) and as we have/had christmas again, so I wrote some code for this panel to make again some Xmas lights! :).

Captive Portal

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#White Hacking: Wemos & Captive Portal using MicroPython

  wemos   esp32   micropython

At the beginning of October I wrote a blog article called White Hacking: WeMos and SquirelCrawl!. I used the WeMos (ESP32) and the firmware provided by Hacker Arsenal to do a captive portal. As you known, a captive portal is a web page which is displayed to newly connected users before they are granted broader access to network resources [

This time, I've implemented the captive portal (system) using MicroPython on the ESP32. This implementation allows you to upload more than one file. This means, e.g. you can upload CSS and JavaScript files for better web page style and more interaction with the user (e.g. using jquery). However, you should not forget that the WiFi speed of the ESP32 as an access point is very limited. You should always optimize the web page!

Python Code: https://github.com/lemariva/uPyPortal

Portal optimization is required! This is only a sample and a very beta code. The portal is far away from stable :S, but it works.


I assume no responsibility for the usage of this code and post. I repeat again, the book "The Hacker Playbook 2: Practical Guide to Penetration Testing - Peter Kim" says

Just remember, ONLY test systems on which you have written permission. Just Google the term “hacker jailed” and you will see plenty of different examples where young teens have been sentenced to years in prison for what they thought was a “fun time.” There are many free platforms where legal hacking is allowed and will help you further educate yourself.

Virus Macro

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#Security: Phishing with Macros once again!

  phishing   macros   security

And once again! Word files with Macro! But this time, I was the first one to report it to VirusTotal and Hybrid-Analysis! :)

Virus Macro!
Fig 1: VirusTotal report! Just only two: Fortinet sells hardware, and Qihoo-360 is in China (:S)...

Here you have the e-mail. The sender is this time the "BOSS Last Name" (A nice improvement! :P) without address, or something like that!

WiPy & Geolocalization

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#MicroPython & #WiPy2.0: Geolocation using WLAN

  wipy   geolocation   google apis   micropython

I was surfing the services that Google offers, I found the Geolocation API. As Google describes the API: it returns a location and accuracy radius based on information about cell towers and WiFi nodes that the mobile client can detect. As I was writing the last post using MicroPython, I thought the WiPy 2.0 could be a nice "mobile client".

To use the API you need to get an API key from Google. As a standard user of the API, you get:

  • 2,500 free requests per day, and
  • 50 requests per second, per user.

I thought I could play with it to test the accuracy of the geolocation.

Python Code: https://github.com/lemariva/uPyGeo

If you’re not up to speed with MicroPython, Wipy see earlier articles in here.

Wemos & Amazon Echo

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#MicroPython: WeMos and Amazon Echo (Alexa) - Switching LED Colors!

  wemos   amazon alexa   micropython   esp32

I don’t have any Belkin WeMo system or Philips Hue light bulbs. However, I have two ESP32 running MicroPython (see my last article), and a W2812b LED strip, and I thought I should be able to say, "Echo/Alexa, turn on the kitchen light" or "Echo/Alexa, turn on the blue light" and It should work with this setup.

And... it works as you can see in this video!

If you are interesting in only using the code, then click here. Otherwise, you can read the complete story... ;)

Python Code: https://github.com/lemariva/uPyEcho

If you’re not up to speed with MicroPython, Wipy see earlier articles in here.