qmicli slow compared to mmcli and AT commands

[Amol Lad]

Hi,

I'm using Solidrun's clearfog-base plarform with Sierra Wireless EM7430 LTE chipset. I'm running OpenWRT 18.06 with ModemManager feed from https://gitlab.freedesktop.org/mobile-broadband/mobile-broadband-openwrt which pulls in libqmi as well.

I noticed that qmicli is slow compared to mmcli or even AT commands read from the modem. For example:

It takes around 160ms for qmicli to produce result (or exit?). I noticed this when I had 4-5 qmicli commands in one script and can observe noticeable slowness.

Please advise what could be going wrong?

root at OpenWrt:/# time qmicli -d /dev/cdc-wdm0 -p --dms-uim-get-imsi
[/dev/cdc-wdm0] UIM IMSI retrieved:
        IMSI: '405861062273068'

real    0m0.151s
user    0m0.016s
sys     0m0.000s

root at OpenWrt:/# time mmcli -i 0
  ---------------------------
  General    |     dbus path: /org/freedesktop/ModemManager1/SIM/0
  ---------------------------
  Properties |          imsi: 405861062273068
             |         iccid: 89918610500008980672
             |   operator id: 405861
             | operator name: Jio 4G

real    0m0.024s
user    0m0.020s
sys     0m0.000s

root at OpenWrt:/# time chat -t 1 -V '' AT+CIMI OK\\r < "/dev/ttyUSB2" > "/dev/ttyUSB2"

405861062273068

OK
real  0m 0.08s
user    0m 0.00s
sys     0m 0.00s

Thanks
Amol
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