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Category: Linux & Unix

All about linux and unix operating systems

RFID Scanner with WeMos, RC522, Homie MQTT & NodeRED in LEGO housing

Published 28. January 2023 by pathfinder

Another link to an interesting report about a project in which a RC522 RFID reader was installed as an input station in a LEGO housing, the whole thing then very thoughtfully implemented with a microcontroller on 8266 basis and RasPi and software-side with Homie MQTT and implemented in NodeRED.

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MQTT server mosquitto on Raspberry Smarthome server does not start

Published 16. December 2019 by pathfinder

Problem

Mosquitto server start problem:

After a few days of absence, I was unfortunately faced with some problems on my Raspberry smart home server.

Among other things, the Mosquitto MQTT server, which is supposed to receive and process messages from the various iot devices, was not available.

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RFID: Tutorial on integrating RFID in NodeRED environment using IBM BlueMIX Technology

Published 31. January 2018 by pathfinder

The linked Tutorial gives a brief overview of all the steps that are necessary to integrate a RC522 RFID Reader via Raspberry PI into NodeRED environment using IBM Bluemix services, watson IOT and nodes.

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RFID-Tags Read/ Write with Raspberry PI and RC522 MIFARE RFID-Reader

Published 31. January 2018 by pathfinder

A very helpful tutorial if you plan to use and install a RFID Cardreader and how to do it with a Raspberry PI Mini-Computer (sorry,…

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RFID: Arduino talks RFID, very useful instruction (german only) !

Published 31. January 2018 by pathfinder

RFID: Arduino talks RFID, very useful instruction (german only) ! https://www.heise.de/developer/artikel/Arduino-spricht-RFID-3464780.html

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Nodemcu: Link to NodeMCU Documentation

Published 25. January 2018 by pathfinder

https://nodemcu.readthedocs.io

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MQTT: Public MQTT Broker

Published 25. January 2018 by pathfinder

MQTT Connection settings for public broker HiveMQ: Webpage: www.mqtt-dashboard.com

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Arduino: Kommunikation über MQTT

Published 25. January 2018 by pathfinder

https://m.heise.de/developer/artikel/Kommunikation-ueber-MQTT-3238975.html

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Arduino: Anwendung mit Servomotoren

Published 25. January 2018 by pathfinder

https://m.heise.de/developer/artikel/Anwendungen-mit-Servo-Motoren-3226402.html

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Linux-commands: ssh tunneling remote server to localhost

Published 1. March 2016 by pathfinder

To start a ssh tunnel from some machine ports 80 to your localhost port 2001 use the following syntax: ssh -N -L 2001:localhost:80 somemachine Enjoy…

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Linux-Commands: Rapidly invoke editor to type long and complex command

Published 1. March 2016 by pathfinder

To type a long and complex command from linux command line can be painful. Helpful might be to invoke an editor for writing the details. …

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Linux Command: Run the last command as root

Published 1. March 2016 by pathfinder

To run the last command as root you simply can use this command: sudo !! Enjoy !

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AWK in Linux

Published 1. March 2016 by pathfinder

awk Linux Commands What is Linux awk Command? Explanation awk COMMAND: awk command is used to manipulate the text.This command checks each line of a file, looking…

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Alias-Command in Linux

Published 1. March 2016 by pathfinder

alias COMMAND:alias command allows you to create a shortcut to a command. As the name indicates, you can set alias/shortcut name for the commands/paths which…

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A nice app

Published 1. March 2016 by pathfinder

Hi, I am using “Guide To Linux”. Click this link to get it. https://play.google.com/store/apps/details?id=com.essence.linuxcommands Enjoy !

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