CO2 Calibration flow:
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1. Connect USB ZigBee dongle to Ubuntu and launch TriS calibration App
2. Set 'Calibration mode' on a device under calibration and power it on, wait until the device registered in the App
3. CO2 ZERO calibration: put both 'ideal' CO2 meter and the device under calibration into one plastix box connected to a nitrogen balloon. Fill the box with the gas and wait until the 'ideal'CO2 meter show 0ppm stable during 15-20 minutes. Enter '0' in appropriate field of the Ubuntu App and press 'ZERO button', check 'Z' field changed on a screen of the device under calibration
4. CO2 SPAN calibration: put both the 'ideal' CO2 meter and the device under test into one plastic box and fiil it with CO2 until the 'ideal' CO2 meter shows desired maximum concentration plus several ppm. Wait until the value stable during 15-20 minutes. Enter the value into 'SPAN' field of the Ubuntu App and press 'SPAN'. Check 'S' value changed on the LCD screen of the device under calibration
