K3A

For many years I have been using RT2870/RT3070 USB WiFi dongles and I was happy with them. They have great Linux support thanks to the ath9k_htc driver.

But as number of IoT devices increased, one day one of them couldn’t connect and hostapd was reporting errors like these:

Could not set STA to kernel driver
nl80211: NL80211_CMD_SET_STATION result: -105 (No buffer space available)

We all got Android devices without a proper manual so here are some basics I have learned over time…

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During my attempt to program an Atmel micro-controller to act as a remote controller sending RC5 commands, the original remote suddenly stopped sending the correct Standby code to the device and I noticed device ID part of the RC5 frame has changed from 0x10 into 0x11. I accidentally switched the original remote to a mode for a different type of appliance! I realized that after I found a nice PDF from Freescale semiconductor showing a table with common device IDs and command IDs.

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Facebook prý spojuje lidi a umožňuje být neustále s přáteli, aniž bych vystrčil nohu z baráku či postele. Facebook se tváří jako nejlepší kamarád a pomocník, že dělá pro nás to nejlepší. Ale je tomu opravdu tak? Read more…

Sending Referer header to the target site after every click on a link is basically revealing URL of the referring site. Several sites mention it as a potential privacy concern but as far as I know there is no UI option in common browsers. Firefox since 28 added “hidden” options for this.
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From what I have seen, many people use weak passwords. But it’s actually easy to make them strong. Let’s see. Read more…

SQL je nejběžnější jazyk používaný pro práci s RDBMs (relační databázové systémy). Protože je užitečné umět pracovat s databází, septal jsem stručný přehled operací, které se pomocí SQL dají dělat na jednoduchých konkrétních příkladech, s odkazy na další zdroje.

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Aby se předešlo překlepům a nechtěné platbě na cizí účet, využívají číšla účtů v ČR formát podle vyhášky č. 62/2004. V tomto článku je odkaz na generátor validních čísel.

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I bought a cheap solar power bank from China to power my temperature sensor. Unfortunately it was shutting itself down once fully charged, requiring me to power on manually again. In this post I will show you my reverse-engineering notes, images and what I did to make it always powered on.

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While trying to find out a way to communicate with my pellet stove I decided to have a look at the LCD communication and maybe learn something new and have fun. It is a segment LCD and maybe you find this useful, especially when designing your own control panel or reusing the LCD from a broken panel.

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