Blog | JackGruber

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:
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
Setup your own Firefox Sync Server with Docker

Posted on November 3, 2018

If you don’t want your bookmarks, tabs, cronics, … to be stored by Firefox in the Firefox cloud, you can run your self-hosted Firefox Sync server. After that, only the Mozilla-hosted accounts server (https://accounts.firefox.com) is used, but the data is stored locally. [Read More]
Tags:
- docker
- howto
- network
- cloud
- firefox
Overlapping subnetworks or how to change Docker default subnet size?

Posted on October 31, 2018

Several services already running were no longer available from subnets after a new container was created using docker-compose. The control of the IP addresses showed that a new network 192.168.X.0/20 was created, which overlapped the existing networks and therefore the communication did not work anymore. [Read More]
Tags:
- docker
- howto
- error
- troubleshooting
- network