To remotely power on/off devices, one would for example think about WiFi Smart Plugs but they require an existing local WiFi that has internet connection and then you need to install an app on your smartphone to be able to control them.

In my example I wanted to remotely power off/on my EdgeRouter (which is responsible for my Internet connection), in case the router hungs up and needs a reboot. Even if the EdgeRouter is connected to a WiFi Smart Plug, if the router hungs up I would not be able to reboot the router because then my local WiFi would be offline too and thus the Smart Plugs not reachable from the Internet. So another possibility would be to utilize the LoRaWAN network, which nowadays is nearly everywhere accessible, especially in cities there are often enough LoRa gateways you could use. Looking for off the shelf products which use LoRaWAN and are able to switch off/on I did not find much.
Sure, there are some possibilities with ESP32 but I wanted a product which is ready to use and just needs some configuration.

Best I could find is the RFI Remote Power Switch and the Dragino LT-22222-L LoRaWAN I/O Controller.

The product from RFI is quite simple to use, RFI offers nice software and a good pdf manual to get it running with the thethingsnetwork.org
nly that it supports "100-250 VAC Universal Input/Output" and "universal IEC320-C14 type input and IEC320-C13 output connectors" which is cool for applications using those parameters/connectors.

But I needed something working with PoE 24V for the EdgeRouter, so the Dragino LT-22222-L looked promising. It has a good wiki with a manual online describing to get it configured for thethingsnetwork.org and is able to switch off/on 24V.



RFI LoRaWAN Remote Power Switch:

Product website: LoRa Remote Power Switch

Manual: https://www.rfi-engineering.com/wp-content/uploads/2020/11/QIG_LoRa_RPSW_v1.20.pdf

see product website to download MacOS/Windows software for configuration of the device
(needs any USB-A to microUSB cable for configuration)


(I bought it from iot-shop.de but they don't offer it any more)

connectedthings.store -> RFI Engineering LoRaWAN Remote Power Switch

market.thingpark.com -> LoRaWAN Remote Power Switch







Dragino LT-22222-L LoRaWAN I/O Controller:

Product website: LT-22222-L LoRa I/O Controller

Manual: http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.1A0Howitworks3F

needs CP2102 Module USB to TTL 6Pin for UART to use shipped cable for configuration


Amazon -> Dragino LT-22222-L LoRaWAN I/O Controller

iot-shop.de -> Dragino LT-22222-L LoRaWAN I/O Controller




Zyxel ES-2108 - Manual 

If you forget the password, how to reset the password to default?

via USB-serial adapter using screen:

Comparison of Twisted-Pair Ethernet Cables


  • UTP - Unshielded Twisted Pair
  • STP - Shielded Twisted Pair
    • S/STP - Screened Shielded Twisted Pair (mit einem Paarschirm als Drahtgeflecht und einem Gesamtschirm als Drahtgeflecht)
    • F/STP - Foiled Screened Twisted Pair  (mit einem Paarschirm als Drahtgeflecht und einem Gesamtschirm als Folie)
  • FTP - Foiled Twisted Pair (aka U/FTP)
    • S/FTP - Shielded Foiled Twisted Pair
  • foo

If you own an UPS (Uninterruptible Power Supply) to power devices while a power failure, you sure know time is running to safely shutdown your devices. For this reason i prefer using low-power and embedded devices which don't consume that much power so are able to run longer while the outage. According to my power-meter the sum of all devices (with modems, switches and a mini-itx server) is at about 70W. My current UPS is an APC BE500GR what according to it's battery specification is just enough to run for about 20 minutes in my situation. Never compared that directly when i bought it but actually it works for less than about 10 minutes, sure the battery suffered already after one-two years usage. Recently a friend called me, talking about his company trashing 16 sealed lead-acid rechargeable batteries, if i might be interested. Even if they might not work at all, i must give it a try i thought, to use them all toghether with my UPS.