Raspbian Stretch OS QMI Network Script Bug Fix
Raspbian/Debian Stretch has a known bug with it's qmi-utils package, specifically the qmi-network script has an error in in.
This bug was reported and a fix shown here : https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=845979
The effect can be noted here :
To fix this we need to modify the file /usr/bin/qmi-network and modify the subroutine start_network and modify line 337 as shown below :
Once this is in place you can then use the qmi-network command as expected
