OSError: Network card not available in MQTT functions

[Alexander Castillo 0]

Hi,

I'm testing MQTT with 2 Wipy's 3.0 like clients with a beagleboard like broker.
I sometimes i have problems with my wipys 3.0 when the main.py run. The program i think it's well because sometimes RUN without problem.

I attach down my code and then the problem