_DEVICE=/dev/ttyUSB3
_DEFAULT_LTE_BANDS="1 2 3 4 5 7 8 12 13 14 17 18 19 20 25 26 28 29 30 32 34 38 39 40 41 42 43 48 66 71"


getinfo() {
    echo "Quectel RM520N-GL"
}

getsupportedbands() {
    echo "$_DEFAULT_LTE_BANDS"
}

getbands() {
# +QNWPREFCFG: "lte_band",1:3:7:8:20:28:38

    O=$(sms_tool -d $_DEVICE at "at+qnwprefcfg=\"lte_band\"")
    echo "$O" | awk -F, '/^\+QNWPREFCFG:/{gsub(":"," ");print $2}'
}

setbands() {
    BANDS="$1"
    [ "$BANDS" = "default" ] && BANDS="$_DEFAULT_LTE_BANDS"

    T=""
    for BAND in $BANDS; do
        case $BAND in
            ''|*[!0-9]*) continue ;;
        esac
        [ -n "$T" ] && T="${T}:"
        T="${T}${BAND}"
    done

    [ -n "$T" ] && sms_tool -d $_DEVICE at "at+qnwprefcfg=\"lte_band\",$T"
}

root@MiFi:~# sh -x /usr/bin/modemband.sh
+ _DEVICE=
+ _DEFAULT_LTE_BANDS=
+ RES=/usr/share/modemband
+ /usr/share/easyconfig/modem/detect.sh
+ DEVICE=/dev/ttyACM0
+ '[' -n /dev/ttyACM0 ]
+ getdevicepath /dev/ttyACM0
+ basename /dev/ttyACM0
+ devname=ttyACM0
+ readlink -f /sys/class/tty/ttyACM0/device
+ devpath=/sys/devices/platform/ahb/1b000000.usb/usb1/1-1/1-1:1.2
+ echo /sys/devices/platform/ahb/1b000000.usb/usb1
+ USBPATH=/sys/devices/platform/ahb/1b000000.usb/usb1
+ cat /sys/devices/platform/ahb/1b000000.usb/usb1/idVendor
+ VID=1d6b
+ cat /sys/devices/platform/ahb/1b000000.usb/usb1/idProduct
+ PID=0002
+ cat /sys/devices/platform/ahb/1b000000.usb/usb1/product
+ PROD='EHCI Host Controller'
+ '[' -e '/usr/share/modemband/1d6b0002EHCI Host Controller' ]
+ '[' -e /usr/share/modemband/1d6b0002 ]
+ _DEVICE=/dev/ttyACM0
+ '[' -z /dev/ttyACM0 ]
+ '[' '!' -e /dev/ttyACM0 ]
+ echo -n 'Modem: '
Modem: + getinfo
+ echo Unsupported
Unsupported
+ echo -n 'Supported LTE bands: '
Supported LTE bands: + getsupportedbands
+ echo Unsupported
Unsupported
+ echo -n 'LTE bands: '
LTE bands: + getbands
+ echo Unsupported
Unsupported
+ echo

+ getsupportedbandsext
+ getsupportedbands
+ echo Unsupported
+ T=Unsupported
+ '[' xUnsupported '=' xUnsupported ]
+ return
+ exit 0


root@MiFi:~# cat /sys/kernel/debug/usb/devices

T:  Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480  MxCh= 1
B:  Alloc=  2/800 us ( 0%), #Int=  1, #Iso=  0
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0002 Rev= 5.10
S:  Manufacturer=Linux 5.10.176 ehci_hcd
S:  Product=EHCI Host Controller
S:  SerialNumber=1b000000.usb
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=  0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   4 Ivl=256ms

T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  2 Spd=480  MxCh= 0
D:  Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=19d2 ProdID=1489 Rev=ff.ff
S:  Manufacturer=ZTE
S:  Product=ZTE
S:  SerialNumber=123456789ABCD
C:* #Ifs= 6 Cfg#= 1 Atr=e0 MxPwr=  2mA
A:  FirstIf#= 0 IfCount= 2 Cls=e0(wlcon) Sub=01 Prot=03
A:  FirstIf#= 2 IfCount= 2 Cls=02(comm.) Sub=02 Prot=01
I:* If#= 0 Alt= 0 #EPs= 1 Cls=e0(wlcon) Sub=01 Prot=03 Driver=rndis_host
E:  Ad=82(I) Atr=03(Int.) MxPS=   8 Ivl=1ms
I:* If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=rndis_host
E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=01 Driver=cdc_acm
E:  Ad=84(I) Atr=03(Int.) MxPS=  10 Ivl=32ms
I:* If#= 3 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_acm
E:  Ad=83(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 4 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=ff Driver=(none)
E:  Ad=85(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 5 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=42 Prot=01 Driver=(none)
E:  Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

T:  Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#=  1 Spd=480  MxCh= 1
B:  Alloc=  0/800 us ( 0%), #Int=  0, #Iso=  0
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=1d6b ProdID=0002 Rev= 5.10
S:  Manufacturer=Linux 5.10.176 ehci_hcd
S:  Product=EHCI Host Controller
S:  SerialNumber=1b400000.usb
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=  0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub
E:  Ad=81(I) Atr=03(Int.) MxPS=   4 Ivl=256ms

root@MiFi:~# opkg list-installed|grep modemband
modemband - 20230302

root@MiFi:~# ls  /usr/share/modemband/
03f00857          05c69215          12d115bb          19d20016          1bc71040          20202033          2c7c0512          2cb70007          _foxconn_common2
03f00a57          12d11506          12d115c1          19d21432          1bc71900          2c7c0125          2c7c0620          413c81d7          _quectel_common
03f0581d          12d1156c          12d115c3          19d21485          1bc71901          2c7c0306EG06-E    2c7c0800          8087095a          _zte_common
03f0a31d          12d11573          12d11f1a          19d21489          1bc71910          2c7c0306EP06-E    2c7c0801          _foxconn_common1