When Python Standard Library is not loaded on digi devices running NDS firmware, you will get the error no module named OS, Follow the below steps to overcome this error.
- Download the file Python Standard Library for NDS-based products only from digi website under Development Software and Sample Code from the following link, http://www.digi.com/support/productdetail?pid=5042&type=documentation
- Rename the file to python.zip(case sensitive)
- Upload to digi device
- Reboot the device.