Multiple phidgets imu with ros and ubuntu 16.04

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I'm trying to connect several IMUs to the same raspberry pi but it seems that the logger reads just one of these sensors. (I've installed the phidgets drivers on the Pi).

I'm currently using the datalogger from this folder: https://github.com/ruvigroup/div_data... using only the IMU.

What should i modify in the logger in order to publish the data coming from different IMUs? I've already tried to <include> two times the imu.launch in the launch file with different "ns" but as soon as i start recording it reboots the logger script.

I've seen that there is another question regarding this in the forum but it doesn't explain that much and considering that i'm a beginner i need some more explanation ;)

Thank you in advance.