• 12
      Mar - 2018

      Real Time Systems
      2 min | 3349

      #Raspberry PI Zero W: Preempt-RT Kernel Performance

      Real Time Systems | 2 min | 3349

      raspberry pi zero

      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...

    • 04
      Mar - 2018

      Web designs
      2 min | 1038

      #Pagekit: Blog & Gallery Extension & AdsenseKit

      Web designs | 2 min | 1038

      ads management
      pagekit extension
      This article is outdated! I am not using Pagekit anymore. Then, I am trying to port the gallery to OctoberCMS.

      I've been working with web development this weekend. I hope you didn't have to wait because of a maintenance dialog or a 500 error due to the updates! I updated three things on the blog:

      I forked the first two repositories and modified them. The last one is a package that I designed to manage the Adsense Ads if you use Pagekit as CMS.

      Blog Extension

      I added the visitor counter for the blog post. You can see the eye over the t...

    • 02
      Mar - 2018

      1 min | 3333

      #Tutorial: Installing dependencies on MicroPython

      MicroPython | 1 min | 3333

      micropython extensions

      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 (ESP32) or the ESP8266, it is possible to install these packages using the upip package manager. The WiPy doesn't have the package.

      To download the new packages, you need to connect the board to the Internet. I take the WeMos as example and typing the following, you can connect the board to your WiFi router:

      ssid_ = <your_ssid>
      wp2_pass = <your wpa2 password>
      import network
    • 02
      Mar - 2018

      Travel Photoset, Web designs
      1 min | 831

      #Photo Gallery: Bangkok

      Travel Photoset, Web designs | 1 min | 831

      travel photoset

      As I promised some photos of Bangkok (Thailand). Enjoy!

      This article is outdated! I am not using Pagekit anymore. Then, I am trying to port the gallery to OctoberCMS.
    • 26
      Feb - 2018

      Real Time Systems
      5 min | 7559

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

      Real Time Systems | 5 min | 7559

      kernel patching
      preempt-rt kernel
      raspberry pi
      standard kernel

      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 Preempt-RT Patch 4.14.21-rt17!

      Hardware & Software

      To follow the DIY parts, ...

    • 26
      Feb - 2018

      Real Time Systems
      7 min | 21373

      #Raspberry Pi: Preempt-RT Patching Tutorial for Kernel 4.14.y

      Real Time Systems | 7 min | 21373

      kernel patching
      raspberry pi
      standard kernel

      There are a lot of tutorials for Raspberry Pi kernel patching using Preempt-RT, 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 ...

    • 19
      Feb - 2018

      Travel Photoset, Web designs
      1 min | 780

      #Photo Gallery: Melbourne

      Travel Photoset, Web designs | 1 min | 780

      photo gallery
      travel photoset
      This article is outdated! I am not using Pagekit anymore. Then, I am trying to port the gallery to OctoberCMS.

      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...

    • 27
      Dec - 2017

      4 min | 1481

      #Micropython: Merry Xmas & Happy New Year!

      MicroPython | 4 min | 1481

      happy new year
      merry Christmas

      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 le...

    • 01
      Dec - 2017

      Android Things
      1 min | 634

      #ProjectDIVA: Android Things DP6.0 is here!

      Android Things | 1 min | 634

      android studio
      android things
      raspberry pi
      sensor mesh

      I will be testing the new release on this weekend!

      The release notes seem promising!

      I have also some new things with Docker and Raspberry Pi!

      Stay tuned!

    • 12
      Nov - 2017

      Hacking, MicroPython, Security
      5 min | 5672

      #Hacking: Wemos (ESP32) & Captive Portal using MicroPython

      Hacking, MicroPython, Security | 5 min | 5672

      captive portal system

      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 [wiki]. This can be used in combination with evil portals to obtain login credentials. The firmware provided by Hacker Arsenal has multiple limitations, e.g. the web page has to be a single file, without external files, meaning that all images should be integr...

    • 03
      Nov - 2017

      2 min | 939

      #Security: Phishing with Macros once again!

      Security | 2 min | 939

      hybrid analysis
      macro virus

      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!

      Guten Tag, Riva, Mauro 
      Bitte die gekennzeichneten Stellen ergänzen und unterschreiben, bitte mit Stempel außer das SEPA Formular. Für die Abbuchung. 
      http://docs.google.de/download/de_DE/doc/ -> with hyperlink (http://elp...
    • 01
      Nov - 2017

      5 min | 2421

      #MicroPython & #WiPy 2.0/3.0: Geolocation using WLAN

      MicroPython | 5 min | 2421

      google apis

      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 2.0/3.0 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: ...
    • 29
      Oct - 2017

      Home Automation, MicroPython
      7 min | 6606

      #MicroPython: WeMos (ESP32) and Amazon Echo (Alexa) - Switching LED Colors!

      Home Automation, MicroPython | 7 min | 6606

      amazon echo
      home automation
      ws2812b leds

      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...

    • 28
      Oct - 2017

      5 min | 15344

      #Tutorial: Getting started with MicroPython

      MicroPython | 5 min | 15344

      visual studio code

      Another quick tutorial, this time for MicroPython on ESP32/ESP8266. You can find all the information that I'm writing in this post in different articles on the Internet but I've not found anything that summarizes all the topics. That is why I am writting this article. I included some links at the end of each topic to extend the info. Feel free to visit them, if you want more information, or write a comment I will try to reply it ASAP!

      Python Code: https://github.com/lemariva/ESP32-MicroPython

      MicroPython & Board

      What's MicroPython?

      Quoting the official micropython page results in the fol...

    • 05
      Oct - 2017

      Hacking, Security
      3 min | 2104

      #White Hacking: WeMos and SquirelCrawl! (update 17.10.2017)

      Hacking, Security | 3 min | 2104

      captive portal
      getting credentials
      webpage compressor

      I was surfing the web for new hacking software and hardware tools and I found the Hacker Arsenal website. This website offers "ARTILLERY FOR CYBER WARRIORS" as they said; it is basically hardware and firmware for pentester. In summary, they have actually three products especially for Wi-Fi Sniffing.

      Python Code: https://goo.gl/YuT5qm

      I found the Winx-Portable (update 17.10.2017: they are not offering this product anymore, they are offering the WiNX) on the website and I thought I have something like that. I look for the boards that I've recently bought, and I find the WeMos WiFi ESP32 D...