Mon bloc-notes

All Digital Technical Journals are available here.

To configure my ThinkPad X13 running Linux Mint for VirtualBox, enter the BIOS menu and set to On the following parameters:

• Security > Intel Virtualization Technology
• Security > Intel VT-d Feature

Thanks to this post, I configured the fingerprint reader of my ThinkPad X13 running Linux Mint 20.1. I can now login just by pressing a finger on the reader. Works for sudo as well.

To convert webp images to png, on a debian-derived linux:

• install webp package
• dwebp <webpFileWithWebpExtension> -o <pngFileWithPngExtension>

This ESP-IDF application initiates a connection to a Wi-Fi access point. Once the connection is established, it sends a UDP datagram to a remote IP address and port.

When the connection is lost, the application tries to reconnect on a periodic basis.

There are two takeaways in this sample application:

This ESP-IDF application receives and decodes advertisement data transmitted by a Ruuvi tag.

I have to check that the checksum of an IPv6 UDP packet is correct. Wireshark is one solution:

• write the UDP packet into a text file, adhering to the format described here
• in Wireshark, ensure that the checksum will be verified: select Edit > Preferences... > Protocols > UDP, and tick Validate the UDP checksum if possible
• import the packet, with File > Import from Hex Dump...
• for Encapsulation Type, select Raw IPv6

And that's it.

An interesting thread about USB, in VirtualBox forum.

The solution which I already used twice: in my Linux host, add the user to vboxusers group.

• Inside look at modern web browser
• How Browsers Work: Behind the scenes of modern web browsers

For young (or less young) software developers who wish to establish their career in software development, some criteria when selecting a company:

• the manager of your future team or the leader of your future project is an experienced developer, who still codes for more than 50% of their time. In every team or project, one can find several experienced developers
• the company has defined a career ladder for developers
• the developer career ladder formally defines several levels, admission criteria for each level, how the ladder compares to the manager career ladder, and how to  go from one to the other