[FS#3306] QMI & DHCP renewal issue.

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Mon Aug 31 04:06:34 EDT 2020 

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FS#3306 - QMI & DHCP renewal issue.
User who did this - MiNuS (bgiboudeau)

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======Additionnal informations.======
I used MWAN3 to monitor the interface the past few days and the script try to restart the interface when it went down. Sometime it stay blocked on the "pin-verify" but it's another story.

====Below the log showing the timing of the problem (exactly every 12 hours the dhcp lease time)====
Fri Aug 28 22:23:32 CEST 2020 - Action:ifdown - Interface:wwan - Device:wwan0
Fri Aug 28 22:23:34 CEST 2020 - Action:ifdown - Interface:wwan - Device:
Fri Aug 28 22:23:40 CEST 2020 - Action:disconnected - Interface:wwan - Device:wwan0
Fri Aug 28 22:23:42 CEST 2020 - Action:connected - Interface:wwan - Device:wwan0
Fri Aug 28 22:23:43 CEST 2020 - Action:ifup - Interface:wwan - Device:wwan0
Sat Aug 29 10:23:28 CEST 2020 - Action:ifdown - Interface:wwan - Device:wwan0
Sat Aug 29 10:23:30 CEST 2020 - Action:ifdown - Interface:wwan - Device:
Sat Aug 29 10:23:37 CEST 2020 - Action:connected - Interface:wwan - Device:wwan0
Sat Aug 29 10:23:38 CEST 2020 - Action:ifup - Interface:wwan - Device:wwan0
Sat Aug 29 22:23:31 CEST 2020 - Action:ifdown - Interface:wwan - Device:wwan0
Sat Aug 29 22:23:34 CEST 2020 - Action:ifdown - Interface:wwan - Device:
Sat Aug 29 22:23:40 CEST 2020 - Action:connected - Interface:wwan - Device:wwan0
Sat Aug 29 22:23:41 CEST 2020 - Action:ifup - Interface:wwan - Device:wwan0
Sun Aug 30 10:23:32 CEST 2020 - Action:ifdown - Interface:wwan - Device:wwan0
Sun Aug 30 10:23:34 CEST 2020 - Action:ifdown - Interface:wwan - Device:
Sun Aug 30 10:23:42 CEST 2020 - Action:connected - Interface:wwan - Device:wwan0
Sun Aug 30 10:23:43 CEST 2020 - Action:ifup - Interface:wwan - Device:wwan0
Sun Aug 30 22:23:30 CEST 2020 - Action:ifdown - Interface:wwan - Device:wwan0
Sun Aug 30 22:23:32 CEST 2020 - Action:ifdown - Interface:wwan - Device:
Sun Aug 30 22:23:39 CEST 2020 - Action:connected - Interface:wwan - Device:wwan0
Sun Aug 30 22:23:40 CEST 2020 - Action:ifup - Interface:wwan - Device:wwan0

====Below another exemple showing the result of the bug.====
My script (see below) log stats of interface before and after interface restart. It also compare the DHCP lease obtained and the UQMI parameters.

Sun Aug 30 22:23:30 CEST 2020 - Action:ifdown - Interface:wwan - Device:wwan0
calling: ubus call network.interface.wwan down
{
        "pdp-type": "ipv4",
        "ip-family": "ipv4",
        "mtu": 1500,
        "ipv4": {
                "ip": "10.92.174.236",
                "dns1": "212.27.40.240",
                "dns2": "212.27.40.241",
                "gateway": "10.92.174.237",
                "subnet": "255.255.255.248"
        },
        "ipv6": {

        },
        "domain-names": {

        }
}
wwan0     Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:10.41.208.219  P-t-P:10.41.208.219  Mask:255.255.255.248
          inet6 addr: fe80::b6a7:6397:3697:50fa/64 Scope:Link
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:69814179 errors:0 dropped:0 overruns:0 frame:0
          TX packets:28061149 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:87843195331 (81.8 GiB)  TX bytes:5812847812 (5.4 GiB)

Sun Aug 30 22:23:32 CEST 2020 - Action:ifdown - Interface:wwan - Device:
calling: ubus call network.interface.wwan down
"Out of call"
wwan0     Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          POINTOPOINT NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:69814179 errors:0 dropped:0 overruns:0 frame:0
          TX packets:28061150 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:87843195331 (81.8 GiB)  TX bytes:5812847876 (5.4 GiB)

calling: ubus call network.interface.wwan up
"Out of call"
wwan0     Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          POINTOPOINT NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:69814179 errors:0 dropped:0 overruns:0 frame:0
          TX packets:28061150 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:87843195331 (81.8 GiB)  TX bytes:5812847876 (5.4 GiB)

calling: ubus call network.interface.wwan up
{
        "pdp-type": "ipv4",
        "ip-family": "ipv4",
        "mtu": 1500,
        "ipv4": {
                "ip": "10.92.174.236",
                "dns1": "212.27.40.240",
                "dns2": "212.27.40.241",
                "gateway": "10.92.174.237",
                "subnet": "255.255.255.248"
        },
        "ipv6": {

        },
        "domain-names": {

        }
}
wwan0     Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:10.92.174.236  P-t-P:10.92.174.236  Mask:255.255.255.248
          inet6 addr: fe80::b6a7:6397:3697:50fa/64 Scope:Link
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:69814181 errors:0 dropped:0 overruns:0 frame:0
          TX packets:28061156 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:87843195969 (81.8 GiB)  TX bytes:5812848916 (5.4 GiB)

Sun Aug 30 22:23:39 CEST 2020 - Action:connected - Interface:wwan - Device:wwan0
Sun Aug 30 22:23:40 CEST 2020 - Action:ifup - Interface:wwan - Device:wwan0


====Below the script used to monitor the interface in MWAN3.====

#!/bin/sh
#
# This file is interpreted as shell script.
# Put your custom mwan3 action here, they will
# be executed with each netifd hotplug interface event
# on interfaces for which mwan3 is enabled.
#
# There are three main environment variables that are passed to this script.
#
# $ACTION
#               Is called by netifd and mwan3track
#             Is called by netifd and mwan3track
#          Is only called by mwan3track if tracking was successful
#       Is only called by mwan3track if tracking has failed
# $INTERFACE	Name of the interface which went up or down (e.g. "wan" or "wwan")
# $DEVICE	Physical device name which interface went up or down (e.g. "eth0" or "wwan0")

Date=`date`
echo "$Date - Action:$ACTION - Interface:$INTERFACE - Device:$DEVICE" >> /tmp/interface.log
if [ $ACTION = "ifdown" ]
then
     if [ $INTERFACE = "wwan" ]
     then
          echo "calling: ubus call network.interface.wwan down"  >> /tmp/interface.log
          uqmi -d /dev/cdc-wdm0 --get-current-settings >> /tmp/interface.log
          ifconfig wwan0 >> /tmp/interface.log
          ubus call network.interface.wwan down
          sleep 3
          echo "calling: ubus call network.interface.wwan up"  >> /tmp/interface.log
          uqmi -d /dev/cdc-wdm0 --get-current-settings >> /tmp/interface.log
          ubus call network.interface.wwan up
          ifconfig wwan0 >> /tmp/interface.log
     fi
fi

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3306#comment8723

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