So if you open the webpage of your gateway, can you see your submitted packages there? If yes, it sounds like a problem with the entered device address or the ttn keys.

Glad you like it. I acutally followed this tutorial for the gateway and used the same code (but with my network and device options): https://www.thethingsnetwork.org/forum/t/big-esp32-sx127x-topic-part-1/10247/128

Hi,
this nees to be done in the files digit.cpp and digit.h.
In digit.h:
change const int numberOfLEDs = 14; to const int numberOfLEDs = 7;
and LED leds[14]; to LED leds[7];

Same in digit.cpp, replace all the "14" with "7".

But its also necessary to change the other functions like "setvalue()".
You'll have to adapt the numbers in the brackets according to your setup:

case 1:
// Top Right
leds[6].turnOn();
leds[7].turnOn();
// Bottom Right
leds[8].turnOn();
leds[9].turnOn();
break;

Top right would be only "leds[3].turnOn() and Bottom right "leds[4].turnOn()

Numbers are like the following:

Center = 0
TopLeft = 1
Top = 2
TopRight = 3
BottomRight = 4
Bottom =5
BottomLeft =6

I'm going to adapt the library but it might be faster for you if you do it yourself ;)