Happy Easter!

Colorful easter eggs

Orthodox Christians Easter Holidays this year are from Friday (10/04/2015) to Monday (13/04/2015).

These are official Holidays in Bulgaria, so if you wonder why your order is not shipped or not moving this is because banks, courier companies etc. do not work during Easter here :)

Greece, Serbia, Montenegro, Russia, Ukraine and Romania also celebrate Easter at these dates.


Espressif ESP8266 Bug Bounty Program – Report a bug and win USD1000


Espressif is working hard to remove bugs in their very popular ESP8266 WiFi SoC. They want to make superior solution to CC3000 competetive product from TI, which is well known for it’s security issues.

So on March 20th Espressif boldly posted on their BBS the Bug Bounty Program – they will give USD 1000 to anyone who reports bug in ESP8266 .

We are working intensively with ESP8266 to make our plug and play IoT solution with pluggable UEXT modules to ESP8266-EVB and one of our developers Peter found bug in SSL implementation where you can brick or reset ESP8266 by sending large amount of data over https. He reported the bug to Espressif and today he got this e-mail:

From: Quote
Sent: Wednesday, April 8, 2015 5:26 PM
To: peter@
Subject: ESP8266-Bug Bounty Winner Information Requirement (BBP#29)

Thank you for your bug report, which will help us improve our SDK.
Our engineer has confirmed your bug report and they will release debug method to you later.
I am assigned to give the reward to you.
Please provide some information to us, which is needed for us to keep record.

a.. The company you are working for
b.. Your name
c.. Your nickname that you want to be announced
d.. contact number or mail
e.. Paypal account or bank account
You should declare tax according to your local law by yourself.

Yay! Quick USD1000 earned :) Glad to see Espressif stands behind their word.

And from the e-mail header seems Peter is not alone but #29 in the Bug Bounty Program.

In other hand if they have decided to open source their binary blobs these bugs would be fixed by the community (which is huge and growing with each next day). So they could save themself these $30K.

Having the sources would also make less nervous people who want to use ESP8266 in more serious stuff where is not good to have “black boxes” with unknown code inside.

Apple ][ emulator with Arduino-Uno, this is insane!


Damian Peckett did something which I would initially think it’s impossible to implement. He made Apple ][ emulator with Arduino-UNO.

How is this possible? Apple ][ had 48 K of RAM but Arduino has only 2K of SRAM? Well he emulates just the video RAM and for BASIC there is just 1K memory, so not the complete memory map is available, but still good proof of concept.

He is generating VGA video signal and use PS2 keyboard. As you can see on this video the emulator is working:


Now if I had some more time to port the code to processor with 48K or more RAM … would have complete Apple ][ on chip and play Karateka :)

i-Kabin solar charging station for users in Africa provide battery charging service for lighting and home appliances powering


Jonathan Primeau shared via Twitter interesting project done with A20-OLinuXino-MICRO. i-Kabin is battery charge station with internet connectivity. People get batteries with build in lighting which can use at home, the battery also have USB port which can charge phones and other appliances. The battery re-charging is done for 8 hours. i-Kabin can be controlled and monitored remotely and can charge 100 batteries per week.




How 50 000 A10 SoCs from Allwinner looks like?


A10 Cortex-A8 chip is the heart of A10-OLinuXino-LIME EUR 30 Linux Open Source Hardware computer. Allwinner start the production of A10 back in 2012 and at the end of 2014 decided to stop it’s production as none of the mass volume producers like tablet or Android IPTV dongle manufacturers wanted to continue to manufacture with it.

For our type of business though – embedded applications it’s not good to change your design every couple of years, so we asked Allwinner if there is minium quantity of A10 which they will be able to run custom production for us and they said 50 000 pcs. We placed our order in December 2014 and they shipped to us on 30 of March as we agreed. Now we have enough stock to keep producing A10-OLinuXino-LIME for a while, and if the stock is over we can make new order to Allwinner, this way we can keep the A10-OLinuXino-LIME production as long as there is demand for it.


As you can see these chips are fresh and left the factory 20/03/2015 :)

TuxCon FOSS conference second edition will be July 11-12 in Plovdiv


TuxCon second event will be July 11 and 12th! It’s free event dedicated to free and open source software for mobile, embedded and wearable devices.

TuxCon will begin on July 10th with Beer Evening Event. On July 11th is the conference part which will begin at 11.00 in Internationa Fair Hall Kirov like last year.

On July 12th there will be workshops in Olimex’s training building. ESP8266 workshop, Arduino workshop, Retro computing party and SMT soldering workshops will run at same time. The workshops will begin 11.00 and will continue… until we feel so thirsty to move somewhere to drink beer again :)

If you want to participate in the Conference part with lecture or lighting talk please submit your request to info@tuxcon.mobi

Bulgaria has the highest average reputation among top users in the Stack Overflow


VB News posted interesting article. They analyzed data from StackOverflow where coders exchange Questions and Answers. Users of the platform vote up or down answers to questions this way ranking the coders who answer the questions and problems posted.

Their analyze shows that London has the highest number of top Stack Overflow members, with 394 that have a reputation over 5,000.


Another ranking based on the average country ranking of Stack Overflow users above the 5,000 threshold shows that Bulgaria has the highest average reputation among top users in the



I have no idea how correct is this analyze, but I’m glad to see finally something IT related, where Bulgaria is #1 in the world :)

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