I am using Leo-4GFi LTE Dongle - It seems to have a QCOM chipset VID/PID (after USB mode switch) =05c6:6001.
Using "proto=qmi" option in /etc/config/network, the device successfully registers to Cellular network & ping to Internet is fine.
The problem is when I issue any uqmi command, the data path gets struck for ever after that. Any further uqmi command does go through fine.
Any help to debug the issue will be highly appreciated.