How to modify the app_eui and app_key in the Kiss Lora Gadget 2017
Is it possible to modify the app_eui and app_key using Putty or Arduino? Where can I find a step-by-step procedure?
Wow that’s a blast from the past! Very foggy on this but if I recall it was similar architecture (ignoring the sensors) to the Things UNO/Things NODE (reporting as a Sparkfun Pro Micro vs a Leonardo) - an ATMega paired with the Microchip RN2483 - the original version that had some bugs not even the later ‘A’ version if I recall. WRT programming the system I think it may depend if enabled via the uC or if there is pass through to the LoRaWAN Module - again I seem to recall there were various commands available - e.g. MAC Set Deveui etc, with supporting get and set commands that I believe included for the AppEUI etc. Unsure if that was via terminal or accessible through the Arduino IDE - it may be you need to load updated value(s) into an appropriate sketch to reprogramme them? Guess this goes back to when you were last active on the Forum some 8 years ago? As they were active with the device and similar back in the day and some of the original TTN related Hackathons from 2016 & 2017 it may be Jac @kersing or Remko @pe1mew may recall all the details and steps involved? So a quick shout out to them to dig into their mental archives! 
Does anything here (or linked from it) help you? GitHub - TheThingsArchive/KISSLoRa-demo: Demo applications for the KISSLoRa device
Hi,
I still use the KISS LoRa in my IOT courses and the demonstration network at our university. The repo I use can be found here: Remko Welling / HAN IoT KISS LoRa · GitLab .
The KISS LoRa is a ATMega paired with the Microchip RN2483 and the Sparkfun Pro Micro bootloader. Normally you set the credentials (appEUI, appKEY, (optional) devID) in the Arduino sketch but you can set them in the RN2483 with AT commands and a sketch that copies TX-RX data to and from the RN2483.
If you want to change the appEUI and appKEY and preserve functionality, program the KISS LoRa with this code: KISSLoRa-demo/KISSLoRa-demo_app at master · TheThingsArchive/KISSLoRa-demo · GitHub else explore the versions I use at school.
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Thanks for your reply, Jeff, and the GitHub link with the original documentation. Suggestions using Google AI haven’t helped me, and I don’t have enough Arduino experience. There are two active gateway stations 1 km away, but data transfer has never been that close. Such a waste of electronic scrap. I’ll keep working with your tips, Jeff!
The collective wisdom of the Community often bests AI 
See Remko’s post just above - confirms what I thought wrt use of a sketch or pass through coding to module. His own repository has some additional good stuff that may also help you. Good Luck!
Thanks Jeff and Remko for you response.
Trying commissioning via OTAA (wireless):
After login on thethingsnetwork.org->console->applications->end devices->take->never->
scroll down->copy the 16hex AppEUI and Appkey and change that in the Arduino KissLora-demo_app.ino and upload the file via the USB successfully.
Switch the KissLora off and again on, I see a burst on 868Mhz on my SDR receiver that then repeats regularly.
Unfortunately, the three local gateways in my area don’t commission, even if I’m within 25 meters of the building where the gateway must be.
Perhaps that are single-channel gateways?
It would be great if I could send the data to opensensemap.org with MQTT.
It’s just for fun and it’s not worth buying my own gateway.
Who knows, I might find the solution someday.
Question: Do the LoRa microchip R2483 and those from other manufacturers understand each other, are they compatible?
As you do not seem to have coverage with the KISS lora. is the matching circuit of your KISSlora modified? The original components are wrong. without the modification you have no range.