Kevwe Technology AB

Reading input from an USB Rfid Card Reader Why Bother I had this cheap RFID reader lying around in the house.

Yats Yet Another Time Serie Use Cases Rest interface for logging, events and metrics Distributed Timeseries Server Datalake Syncing Strong authentication with mTLS Distributed logging Sensors logging For more detail see also: Yats Features History For a b…

YATS Features Use cases Yats was born with the following features in mind: IOT Data Single sensor, single row Multiple sensors, Json map Multiple sensors, custom protobuf Embedded Client in C Application Logging Simple text in Base64 Json attributes + Bas…

Build Your Own Cassandra Cluster All you need 2N+1 linux machines (virtual?)

Sensor Data and Distributed Logging with Timeseries Data Series There is a lot of data series products available at the current time.

Security Headers Some Practical Help In DPO circles there is a lot of talking about Security Headers, there are nice tools to assess the security of your website, and new ones crop up all the time.

Security Headers A Practical View I see specifically in DPO circles there is a lot of talking about Security Headers, where there are nice tools to assess the security of your website, specifically in this context: SecurityHeaders.com Given that I see no…

Developer Quality Time On every software projects developers use a variety of tools, and it is not really possible to impose an overall standard that works for everyone.

Cert-Encoder Cert-Encoder is a Java library that implements two strategies for encrypting/decrypting data: A symmetric schema using AES-CBC-256 A schema based on a public/private keypair (PKCS#7 / CMS) The asymmetric schema is meant to be intoperable with…

Iron An Offline Certificate Authority Value Proposition Iron helps developers to setup a Certificate Authority to secure Online Assets on mTLS What it this IRON is a collection of scripts that implement an offline Certification Authority for signing inter…

X509Crypt X509Crypt is used to encrypt files that makes use of PKCS#7 and public keys from a recipient's X509 certificates.

Cert-Signer Cert-Signer is a Java library that implements a Private CA, able to issue X509 certificates to clients of any kind of services within your organization.

The 5 minutes guide to stop selling out your DNS queries to BigTech Install Dnsmasq and stop the madness DNS Know it or not, every DNS query you do can be logged by your ISP or, if you follow a lot of bad advice online, directly into the mouth of the beas…

Computing On The Edge - 202349 Everything is vulnerable, Everything is Ok If we want to stay sane, as builder of things, we should of course define purpose, but then also a budget.

Computing On The Edge - 202347 Humanity At The Crossroads A lot has been going on in the latest weeks, everyone seems to get busier and busier before going off for the holidays on the calendar.

Computing On The Edge - 202344 Coding On a Train Most people is happy of going back to an in-presence, interactive reality, which includes a lot of sweat and commuting back'n'forth towards some part of the town most filled with offices.

Computing On The Edge - 202342 Conferencing with Jitsi I just recently needed a quick tool for making conferencing calls, and I went for Jitsi.

Computing On The Edge - 202341 Build vs Buy Some developers have a strong bias towards action: you sense a need, and then start building.

Computing On The Edge - 202340 Features vs Fixes I do not understand the perfection as a value in itself.

Computing On The Edge - 202339 Making and Breaking of Real Applications You might think that what makes an application last is the idea behind it.

Build an IOT Service from the ground up Firmware and Embedded Developers Book a Time What is this This is an advisory service for embedded developers who want to put digital services out in the world, but want to remain focused on their own craft.

Computing On The Edge - 202338 It Is Not About The Style Whatever you do for a living, how you do it it's probably not as important as why you do it.

Computing On The Edge - 202337 It Is Not About Speed Spreading computation across a cluster can be about being faster, processing more, and in less time.

Advisory Service - Avoid Kubernetes Book a Time What is this This is an advisory service for those who want to put digital services out in the world, but are not willing to go the Kubernetes' way and containerize everything.

Implementing a self-hosted S3 server Some Concern S3 would give you some peace of mind, since it'll solve your problem of storing data somewhere.

Computing On The Edge - 202334 The Price of Being Original Our present does not forgive being original.

Computing On The Edge - 202333 Expertise In the Wild Knowledge in every discipline, every field has typically a lot of nuances, there is the truth, and then there are truths.

Computing On The Edge - 202332 Praise To The Headless I've been maintaining for long that user interfaces are overhyped, they currently take much more work than they should.

Computing On The Edge - 202331 The Unbearable Lightness of Code In the economy of keeping things lean and secure, software maintenance often includes deleting code that is not used or tested.

Computing On The Edge - 202330 The automation of Idea Generation Automating idea generation could be a good thing if what you are looking for is a concert of different voices.

Computing On The Edge - 202329 Building an Antisocial Network I think the whole idea with Social Networks was not too bad in principle.

Computing On The Edge - 202328 Some Cloud Native Madness The heat is usually not friend of computing.

Computing On The Edge - 202327 Trendy Considered Harmful Cheaper, faster, long lasting: this is how we need good software to be.

Computing On The Edge - 202326 The Headless Way Every now and then, I might have to jump between different operating systems, and what I find frustrating the most is programmer's hybris in reinventing new brighter ways to do the same things all the time.

Computing On The Edge - 202325 The Problem with Visionaires I am as much of a visionaire as one who said when Ipad first hit the market: "Who the hell will ever buy an overpriced laptop with not even a keyboard attached?"

Computing On The Edge - 202324 Common Sense Is a Bad Thing Thinking that you are doing something good just because it is 'common sense' is probably a bad thing.

Computing On The Edge - 202323 A Shell Script will replace us all I am pretty sure the day is near, it is coming for our jobs, and will replace us all.

Computing On The Edge - 202322 Here On The Ground Discussion about the Cloud has been interesting in the last couple of years, because it has meant to be able to deal with technologies economically out of reach for most of us taken individually.

Computing On The Edge - 202321 World Eating Software Software will eat the world, someone said.

Computing On The Edge - 202320 Human Edited Linked Content As I started putting out weekly this short list of read recommendations, I got away with the placeholder name of "The Weekly Dev".

Of Evil Bots and Good ones Some Context A recent estimate attributes half of the traffic of the whole internet to Bots.

What you can do with a private Certificate Authority x509 Certificates An X.509 certificate is a digital document that is used to verify the identity of a person, device, or organization on the internet.

Why Maintaining a private CA For a lot of use-cases, software has become a commodity.

About Some Hyped ML stuff Honestly, I know most of us is pretty much fed up of reading about Chat-GPTx.

How to implement a VPN Sometimes you would want to be in your office, because you need to press that very button, just now, and you wish you had not left, you need to come back, start your machine again, start all the environment, double check if it'up.

Debian Administration Support serving your own data Having assets 'on the cloud' is now a necessity, but what you probably do not want is to give away your data to the bigger providers.

Port Forwarding for Linux KVM guests If you are hosting a couple of virtual machines off an Linux KVM Host, chances are, you do not only want to reach the outer network from the machines, but you might also want to publish externally on port N a service t…

How to Share a directory with the Guest System Linux KVM sudo virsh edit <machine-name> after currentMemory add: <memoryBacking> <source type="memfd"/> <access mode="shared"/> </memoryBacking> and in devices add: <filesystem type="mount" accessmode="passt…

From Swagger 2.0 to OpenAPI The road of the API is paved with breaking library changes I still recently read articles like this one where it is shown that people seems to use more the older Swagger 2.0 than the more recent OpenApi 3.x specification.

API development Secure APIs for Industrial IOT projects By 2025 there will be 75 billions of connected IOT devices. e known for some time that IOT would be the next big thing, and you have now a solution that is ready to rock, or - at least - a well defin…