Blog

From Evernote to Joplin

Posted on December 30, 2020

For the past year, I’ve been using Joplin for my note management. Previously, I had used Evernote for years, but wanted to get away from it, because all notes stored in the cloud. [Read More]

Tags: Evernote Joplin Cloud Workflow

ESP32 battery/solar powerd environmental sensor

Posted on December 27, 2020

This year I tinkered with an environmental sensor, which should be solar powered and transmit the readings via LoraWAN (thethingsnetwork). [Read More]

Tags: ESP32 LoraWAN TTN PCB DIY Solar

Making an APC Back UPS CS500 smart

Posted on October 16, 2020

I still have an APC Back-UPS CS500 which protects my Synology, Rasperry PI and co. Since it’s not network-capable and only has “Simple Signalling”, I want to do this with an ESP8266 smart. [Read More]

Tags: ESP8266 IoT APC UPS MQTT Tasmota

Own syncserver with Firefox 80 (79 on Android)

Posted on August 29, 2020

Since the Firefox update to version 80 and 79 on android a few things have changed to be able to use your own syncserver as described in the blog post Setup your own Firefox Sync Server with Docker. [Read More]

Tags: firefox howto cloud

Docker monitoring

with Grafana, prometheus, cadvisor and exporter

Posted on August 15, 2020

[Read More]

Tags: Docker Grafana Monitoring Raspberry Pi HowTo

ESP32 DeepSleep and LoraWAN OTAA join

Posted on April 13, 2020

When the ESP32 goes into DeepSleep and wake up, it will not restart the code execution from where it entered DeepSleep, like an ATmega witch restarts code execution at the same place including all set variables. The ESP32 starts in the Setup function an reinitializes all variables, this means that... [Read More]

Tags: ESP32 LoraWAN Arduino µC LMIC TTN

Low power Arduino Pro Mini

Posted on December 27, 2019

For various projects where a long runtime with batteries is important I use a modify Arduino Pro Mini 328 3.3V/8Mhz (ATmega328P). As an example a flashing sketch is used, which turns the LED on for 1 second and off for 8 seconds. [Read More]

Tags: howto hack Arduino µC Hardware

gnupg cannot connect to keyserver

keyserver receive failed: Connection refused

Posted on June 7, 2019

On a docker project where i had to add gnupg keys i always got an error keyserver receive failed: Connection refused. After a while of troubleshooting, i realized it’s not a connection or DNS problem. But that the Dirmngr did not use the configured DNS servers of the system. gpg... [Read More]

Tags: docker error troubleshooting

Security hardware key on Github with Firefox

Spoof User Agent in Firefox

Posted on June 7, 2019

Github currently supports hardware security keys (SoloKeys, Yubico, …) as second factor only with Google Chrome but not with Firefox, although Firefox supports U2F and on other sites this also works flawlessly. This browser doesn’t support the FIDO U2F standard yet. [Read More]

Tags: howto firefox U2F SoloKeys security FIDO U2F 2FA

PowerShell and MQTT

Posted on June 5, 2019

A small blog entry how to use MQTT in Powershell, as a library I use M2MQTT. [Read More]

Tags: powershell code mqtt iot