ok, well, fact is i don't have time at the moment to dive into TerraGear, so will made all needed on "surface"
My other project is very time consuming
![Image](http://img11.hostingpics.net/pics/84325420160428222542.jpg)
All is home made (no commercial interface, no sim commercial part), heart of the system is a raspberry PI 2, with some I2C device (port extender & led / display manager).
Software is written in python
I ll try to make a video soon