Hi Johannes,
I just found your ping pong example - exactly what I was looking for, so thanks for making it public!
However, I can’t get it to work (I think), maybe because I am using E5-LE, not just ‘E5’ devices.
I have one E5-LE mini and one E5-LE.
The E5-LE starts up normally, printing something along the lines of
APPLICATION_VERSION: V1.3.0
MW_RADIO_VERSION: V1.3.0
---------------
LORA_MODULATION
LORA_BW=125 kHz
LORA_SF=7
0s026:rand=750
But then nothing happens. If I put a break in main, it arrives there one time, then, when I press go again, it goes into some low power sleep, and never comes back.
May I ask if this is how it is supposed to work? I.e. I’m thinking, maybe it is sleeping, waiting for another board? But I am not sure it even sent something itself, before going into sleep. Not in an obvious way, anyway?
Hope you may be able to enlighten me, some time when the Christmas food has been processed 
Regards,
Micael