sample_coord.txt file has been made by using the output of `experiment-cli info -l --site lille`, then converting it to csv, and cleaned to obtain only id,x,y,z.
sample_data.txt file has been made by running the 01-sensors-collecting iotlab example in contiki on all available lille's nodes and catching the serial_aggregator output.
The submission script build a dictionnary by reading the data file, then complete the dict with coords of nodes by reading the coord file.