i have router zbt with OpenWrt 21.02 with 4g modem on it
Modem model :Quectel EC25
I need to get answer from modem into variable
so i write ash script:
#!/bin/ash
getinfo=$(echo -e ATI | socat - /dev/ttyUSB3)
echo " $getinfo "
And i cant get any information in terminal
But if i use
socat - /dev/ttyUSB3,crnl
and then put AT commands it is all good but no answer if it is in the script answer into $getinfo
root@OpenWrt:~# response=$( echo "ATI" | socat - OPEN:/dev/ttyUSB1,crnl,ignoreeof )
root@OpenWrt:~# echo "$response"
ATI
Manufacturer: huawei
Model: E3372
Revision: 21.200.07.00.00
IMEI: <censored>
+GCAP: +CGSM,+DS,+ES
OK
well i did like you did but noothing
root@MakarSklad:~# echo "ATI" | socat - OPEN:/dev/ttyUSB3,crnl,ignoreeof
root@MakarSklad:~# response=$( echo "ATI" | socat - OPEN:/dev/ttyUSB1,crnl,ignoreeof )
^C
root@MakarSklad:~# ^C
root@MakarSklad:~# response=$( echo "ATI" | socat - OPEN:/dev/ttyUSB3,crnl,ignoreeof )
root@MakarSklad:~# echo "$response"
root@MakarSklad:~# response=$( echo "ATI" | socat - OPEN:/dev/ttyUSB1,crnl,ignoreeof )
^C
root@MakarSklad:~# ^C
root@MakarSklad:~# response=$( echo "ATI" | socat - OPEN:/dev/ttyUSB1^Crnl,ignoreeof )
root@MakarSklad:~# ^C
root@MakarSklad:~# echo "ATI" | socat - OPEN:/dev/ttyUSB3,crnl,ignoreeof
root@MakarSklad:~# echo "ATI" | socat - OPEN:/dev/ttyUSB0,crnl,ignoreeof
root@MakarSklad:~# echo "ATI" | socat - OPEN:/dev/ttyUSB1,crnl,ignoreeof
^C^C^C^Z^Z^X^Z^C^C^V^[[A^[[A^C^C^X^Z^Z^A^A^C^C^Croot@MakarSklad:~# ^C
root@MakarSklad:~# ^C
root@MakarSklad:~# echo "ATI" | socat - OPEN:/dev/ttyUSB2,crnl,ignoreeof
root@MakarSklad:~# echo "ATI" | socat - OPEN:/dev/ttyUSB3,crnl,ignoreeof
root@MakarSklad:~#
tried difrent USB no luck ..
i use modem-manager for connection
Perhaps ModemManager, merely by virtue of keeping the port open, eats the response? Try stopping it and rechecking.
Anyway I vaguely remember that, when debugging is enabled, you can issue arbitrary AT commands via mmcli. Cannot check as I am not at home right now.
i tried to use mmcli but got this respose
root@MakarSklad:~# mmcli -m /sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.3 --command=ATI
error: command failed: 'GDBus.Error:org.freedesktop.ModemManager1.Error.Core.Unauthorized: Cannot send AT command to modem: operation only allowed in debug mode'
root@MakarSklad:~#
root@MakarSklad:~# mmcli -m /sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.3
-----------------------------------
General | path: /org/freedesktop/ModemManager1/Modem/6
| device id: 4f4298xxxfa6dd49xxxxxe05be4c80xxxx4422f9
-----------------------------------
Hardware | manufacturer: QUALCOMM INCORPORATED
| model: QUECTEL Mobile Broadband Module
| firmware revision: EC25ECGAR06A07M1G
| carrier config: default
| h/w revision: 10000
| supported: gsm-umts, lte
| current: gsm-umts, lte
| equipment id: 8xxxxxx49118670
-----------------------------------
System | device: /sys/devices/platform/101c0000.ehci/usb1/1-1/1-1.3
| drivers: option1, qmi_wwan
| plugin: quectel
| primary port: cdc-wdm0
| ports: cdc-wdm0 (qmi), ttyUSB0 (qcdm), ttyUSB1 (gps),
| ttyUSB2 (at), ttyUSB3 (at), wwan0 (net)
-----------------------------------
Status | lock: sim-pin2
| unlock retries: sim-pin (3), sim-puk (10), sim-pin2 (3), sim-puk2 (10)
| state: connected
| power state: on
| access tech: lte
| signal quality: 100% (cached)
-----------------------------------
Modes | supported: allowed: 2g; preferred: none
| allowed: 3g; preferred: none
| allowed: 4g; preferred: none
| allowed: 2g, 3g; preferred: 3g
| allowed: 2g, 3g; preferred: 2g
| allowed: 2g, 4g; preferred: 4g
| allowed: 2g, 4g; preferred: 2g
| allowed: 3g, 4g; preferred: 4g
| allowed: 3g, 4g; preferred: 3g
| allowed: 2g, 3g, 4g; preferred: 4g
| allowed: 2g, 3g, 4g; preferred: 3g
| allowed: 2g, 3g, 4g; preferred: 2g
| current: allowed: 4g; preferred: none
-----------------------------------
Bands | supported: egsm, dcs, utran-1, utran-8, eutran-1, eutran-3, eutran-7,
| eutran-8, eutran-20, eutran-28
| current: utran-1, utran-8, eutran-3
-----------------------------------
IP | supported: ipv4, ipv6, ipv4v6
-----------------------------------
3GPP | imei: xxxxxxxxxxxxxxxx
| enabled locks: fixed-dialing
| operator id: xxxxx
| operator name: MegaFon
| registration: home
-----------------------------------
3GPP EPS | ue mode of operation: csps-2
| initial bearer path: /org/freedesktop/ModemManager1/Bearer/16
| initial bearer apn: public.mc
| initial bearer ip type: ipv4
-----------------------------------
SIM | primary sim path: /org/freedesktop/ModemManager1/SIM/5
-----------------------------------
Bearer | paths: /org/freedesktop/ModemManager1/Bearer/17
It says AT command allowed only in debag mode , but woud the modem still working normally in debag mode ?
i need to get signal levels while modem is working
The signal levels can be obtained without running AT commands manually.
mmcli -m 0 --signal-get
Regarding the debug mode - it won't affect the connectivity. It's ModemManager who is in debug mode, not the modem itself. Just edit the script in /etc/init.d, and add the --debug option to the ModemManager command line there.
Well i googled commands for mmcli but there wasnt all options apparently but i did find it in mmcli --help-all
Anyway thanks a lot ! 
But i also need to see which station i connected to , maybe there is an otion for it ?
Oh i find it!!! and it works ))
--location-get
Yes there is, exactly where you found it 
mmcli -m 0 --location-enable-3gpp
mmcli -m 0 --location-get
You will get the mobile country code and mobile network code, as well as the cell ID.
Yeah all seems works ! Thanks a lot !
and now i am looking for option to get which band the modem connected to
well no it wont give me band
root@MakarSklad:~# /root/getrsi.sh
--------------------------
3GPP | operator code: 250
| operator name: 2
| location area code: FFFE
| tracking area code: 149A
| cell id: 07EFE102
----------------------
Signal | refresh rate: 3 seconds
----------------------
LTE | rssi: -42.00 dBm
| rsrq: -9.00 dB
| rsrp: -74.00 dBm
| s/n: 4.40 dB
no band 
band or frequincy
It is not currently possible to get the current band via mmcli without resorting to manual AT commands. Please refer to this feature request: https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/issues/226
BTW, the manual page of mmcli recommends using the --output-keyvalue option in shell scripts if you need to get the information in machine-readable form.
YEah option -K gives better answer for grepping paramets
also i have to use
mmcli -m /org/freedesktop/ModemManager1/Modem/6
not
mmcli -m 0 (doesnt work for me)
and everytime modem is rebooted the link changes like not it is /org/freedesktop/ModemManager1/Modem/7
so i did this and all fine
modemlink=$(mmcli -K -L | grep "modem-list.value" | awk '{print $3}')
location=$(mmcli -m $modemlink -K --location-get )
sleep 1
siglvls=$(mmcli -m $modemlink -K --signal-get)
mmcli -m 6
is a shorthand for
mmcli -m /org/freedesktop/ModemManager1/Modem/6
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