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I graduated long time ago as electronics engineer but eventually ended up in software engineering. Recently I wanted to start playing again a bit with electronics and decided to build some mundane projects just to try to understand popular components. In this post I show the popular Led Chaser, implemented using a 555 timer and 4017 Read More …
Installing the toolchain Add a .list file in /etc/apt/sources.list.d/ containing : “deb http://emdebian.org/tools/debian jessie main” Update the public key for this repo with ‘curl http://emdebian.org/tools/debian/emdebian-toolchain-archive.key | sudo apt-key add –‘ Add armhf as foreign architecture by running ‘sudo dpkg –add-architecture armhf‘. Check correct install with ‘dpkg –print-foreign-architectures‘ which should show ‘armhf‘ Run ‘sudo apt-get Read More …
You have resources you can throw away (stateless) and resources you can’t throw away (state-full). Donald Knuth said it beautifully: there is nothing you can’t solve without an extra indirection. To achieve blue/green deployment on AWS, you put all your resources that can die and revive (think auto scaling groups, malicious terminations, but also whole Read More …
In a previous post I talked about the pairing issues on an Ubuntu machine with a vanilla (otherwise decent) Bluetooth USB adapter. Further down the road, doing nothing really special than using the QC35 on my smartphone, laptop and (Ubuntu) desktop at home, it seemed to work for, well since my last post about it. Read More …
The latest certbot-auto tool comes with a new feature (or I must have missed it 3 months ago) that spawns up a temporary web server on port 443. This is a huge improvement IMHO as it avoids the permissions hassle you can have on a security-hardened web server installation (be it Apache, IIS, Nginx, …). The Read More …
I recently bought a cheap but working Bluetooth usb dongle (Konig CSBLUEKEY200) for a refurbished desktop running Ubuntu 16.04. Connecting to my Nexus 6 Android phone worked seamlessly, so confident about it I hurried to connect my Bose Quietcomfort 35 headphone. I initially got it detected but pairing was a no go, whatever I Read More …
Following the instructions at https://certbot.eff.org/#ubuntuxenial-apache didn’t do it for me. With Apache, it’s always tricky. I’m currently using a bitnami WordPress EC2 instance, so I had to figure out the certbot stuff. It was actually not that hard. As with many command line tools, everything starts with reading the documentation 🙂 The certonly option does the trick! Always. Read More …
After reading the post https://blogs.msdn.microsoft.com/dotnet/2017/03/09/new-features-in-c-7-0/ I can’t rid of the feeling MS is converting C# to F# 🙂 Great idea!
What OAuth2 (RFC6749 at https://tools.ietf.org/html/rfc6749) tries to solve is delegated access control to a protected resource. Typically a user (the resource owner) gives consent so that a client can access a protected resource (a REST API endpoint for example). However, it is/was common to abuse the protocol and introduce special ‘scopes’ like ‘signin’ or ‘authn’ Read More …
Packaging the application is really not harder than calling : msbuild <pathtoprojectfile> /t:Package /p:DeployIisAppPath=”Default Web Site” But there is more… Through configuration files in a subdirectory .ebextensions (at the level of web.config) you can add multiple .config files (in yaml format) that let you do all kinds of stuff, from running scripts, simple commands to downloading Read More …