keenetic v3.7+ qmi signal levels for PRTG monitoring

a (custom ssh script sensor)

Requirements:

• Keenetic os v3.7 and above (tested to work with v3.7 b2 - 3.8.2)
• USB LTE modem in QMI mode, that reports its signal levels with a command "show interface UsbQmi0" in keenetic's CLI.
• Entware installed and it's ssh accessible from your PRTG server/probe.
• Make sure modem also reports its signal into entware with "ndmq -p "show interface UsbQmi0" -x"
• a file manager (like mc)

Installation:

1. Place file S99ltestat at /opt/etc/init.d/
2. chmod 744 +x /opt/etc/init.d/S99ltestat
3. Place file lte.sh at /opt/etc/
4. chmod 744 +x /opt/etc/lte.sh
5. Reboot your router
6. Add a new sensor in your prtg server (custom ssh script), select "lte.sh"

Extra: You can monitor an unlumited amount of modems, but you need to create an additional "lte.sh" (with a diffirent name) for each modem. Then change the polled interface in the lte.sh as it is named in your router (i.e. UsbQmi1, UsbQmi2 ...)

tested with modem T77W968/DW5821e fw. F1.0.0.5.2.GC.013 035