What should be really have JOIN EUI?

1

Hi,
I am back with LoRaWAN after a long pause and I am going to install a irrigation station and a meteo station.

Then I need to register two new station in a new application. I created the application and now I am create a OTAA station.

I just observed DevEUI and I have no idea about the number I have to save.
I look at my arduino file (for a previous station) and I can not find a similar information. I also understand that DevEUI replaced AppEUI. If now I look at my prevoious , I can see that I recorded the value ‘0000000000000000’.

Even if all my 30 stations worked fine, I wonder if the value of 000000000000000 is relevent

I can read in the black bulb where statnd the ?

Screenshot 2025-06-09 at 15.37.00
Screenshot 2025-06-09 at 15.37.00742×672 65 KB

As I developed my own station, I am concerned by the last section “What if I can not find the correct value”, then I supposed I can enter ‘0000000000000000’ but the black bulb also state

Ensure that you use the same JoinEUI in your end devise as you enter in the Thinks Stack

As my stations have a unique ID and the new onw has the id 43, I wonder if the value of 00000000000000 is a good choose, even if it as been working.

Would it be not better to have the value 0000000000000043? or it does nit matter?
And then for my next own devise, I could have as a JoinEUI 0000000000000044?

I also look at my new application (The Things Stack) if there is value with 16 digit, but none

Many thank for this clarification

2

This is incorrect. It says in the info box “The JoinEUI (formerly called the AppEUI)” which is correct.

Without knowing what firmware / stack you are using on your device, it’s hard to advise, but most up to date stacks can cope with all zeros for the JoinEUI and then you can get a DevEUI from the console and use that on your device.

If you buy a device they normally come with a Dev & JoinEUI.

The Learn section will explain the difference between ABP & OTAA and the different EUI’s & Keys you need for each setup.

3

It did not.

The JoinEUI replaces the AppEUI. The DevEUI should still be a unique value for each device. You can ask TTN to generate one for you. For the Join/AppEUI you can use all zeros without any issues. Just make sure the DevEUI is unique.

4

@kersing Oups, sorry. It’s my fault, I wanted to write JionEUI replaced AppEUI.

Actually, I am using Arduino-LMIC.
I understand that I could set 0000000000000000, but would it be a good idea to set
0000000000000041 for all stations for application1
0000000000000051 for all stations for application2

Same JoinEUI for all stations of the same Application?
Otherwise, I will sett 0
etc…

5

No it would not. There is no need to use anything but all zeros. Or an officially assigned (to your device) JoinEUI.