Problems with setting up an OTAA Node in TTN **SOLVED**

[cylex]

Hey there!

I'm new to the whole IoT world (sorry for that) but the LoPy seemed really interesting so i decided to order two of them. As a first step I wanted the two LoPys to communicate with eachother in TTN (one as a GW and the other as a node). Setting up the first Lopy as a nano GW in TTN was easy thanks to @bucknall and his tutorial. But I'm getting problems with setting up the Node:
I took the dev_eui; app_eui and the app_key numbers and pasted them into the otaa_node.py. After that I transferred that file to my LoPy and nothing happened. Do I have to rename that file? What needs to stand in the main.py file? Do I need to add additional files to the lib or sys folder? BTW I'm using the newest firmware (1.6.12.b1) and when I try to run the file I'm getting an error like this:
Traceback (most recent call last):
File "main.py", line 15, in <module>
ValueError: odd-length string

Anyone an idea? Thanks for your help!

[cylex]

@livius oh man, such a stupid mistake! thank you man!

[livius]

@cylex

i do not know what you have in main.py on this line but look if it is e.g. unterminate hex values
e.g.

app_eui = binascii.unhexlify('AD A4 DA E3 AC 12 67 6B'.replace(' ',''))

but you store

app_eui = binascii.unhexlify('AD A4 DA E3 AC 12 67 6'.replace(' ',''))

above missing second char "B" in pair (last char in the string) (odd chars but must be even)