Confused with primary port (ttyUSB3) with other ports

[Subramonia Pillai]

Friends, small help.

mmcli -m 0 shows  'ttyUSB3; as primary whereas ttyUSB4 as part of ports as
below. [Why two devices, I am not understanding. but I went ahead].


System   |         device:
'/sys/devices/pci0000:00/0000:00:16.0/usb1/1-1/1-1.1'
               |        drivers: 'option1, huawei_cdc_ncm'
               |         plugin: 'Huawei'
               |         primary port: 'ttyUSB3'
               |          ports: 'ttyUSB3 (at), ttyUSB4 (at), wwan1 (net)'

Then I confimed USB3 and USB4 is used by my modem vendor as below

root at vyos:/opt/vyatta/share/ppp/network#  grep PRODUCT=
/sys/bus/usb-serial/devices/ttyUSB3/../uevent
PRODUCT=12d1/1506/102
root at vyos:/opt/vyatta/share/ppp/network#  grep PRODUCT=
/sys/bus/usb-serial/devices/ttyUSB4/../uevent
PRODUCT=12d1/1506/102

1. The first problem is when I run AT commands in ttyUSB3 is not
responding. So proceded with ttyUSB4 and the following commands worked
perfectly till before connection error.

echo -e "ATZ\r" > /dev/ttyUSB4
echo -e "AT+COPS?\r" > /dev/ttyUSB4
echo -e "AT+COPS=0,2\r" > /dev/ttyUSB4
echo -e "AT+COPS?\r" > /dev/ttyUSB4
echo -e "ATZ\r" > /dev/ttyUSB4
echo -e "AT+CGDCONT?\r" > /dev/ttyUSB4
echo -e 'AT+CGDCONT=1,"IP","airtelgprs.com","",0,0,0,0,0,0' > /dev/ttyUSB4

tr -s "\n" < /dev/ttyUSB4

While connecting by "echo -e 'ATD*99***1#' > /dev/ttyUSB4" modem is
returning ERROR.

2. As a workaround, I went with mmcli --simple-connect, which is throwing
'ttyUSB3' device is closed.

root at vyos:/opt/vyatta/share/ppp/network#  mmcli -m 0 --simple-connect="apn=
airtelgprs.com"
error: couldn't connect the modem:
'GDBus.Error:org.freedesktop.ModemManager1.Error.Serial.OpenFailed: Could
not open serial device ttyUSB3: it has been forced close'

So I can establish the connection. Could anyone please guide me.

Thanks
Subbu
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/modemmanager-devel/attachments/20180320/944abbbb/attachment.html>