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simple but effective script to revive wwan modules on openwrt and laptops
CastixGitHub/re_wwan
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simple but effective script to revive wwan modules on openwrt and laptops
openwrt-lte-keep-alive Have been around since at least 4 years now,
I see people forking it but the idea is just stupid.
I didn't accept to just reboot the whole device,
and insisted on debugging the issue more accurately.
So I decided to write this script.
wwan modules are great under my point of view, as ISP prices are usually lower than any other technology.
they reach places where fiber and adsl are unavailable, and satellite is not worth it because you don't plan to stay in that place so long.
wwan allows you to benomad enjoy it, go take a shower in the rivers.
wwan is great as fallback connection in environments meant to be reliable (and you can't just reboot the whole device!)
I'm stealing this
If your WAN interface using WWAN/QMI/NCM/3G protocol with your modem is workingbut your connection drops from time to time, you have just found the safe heaven.This script make sure your router is online, managing your interface or router itself.It does ping quad9 servers to know if you're online1
If you're offline it tries to bring the interface up withifup
pings again
if you're still offline the module is reloaded in the kernel (rmmod andinsmod)2
it always log link quality and other debugging informations gathered through serial interface to the modem, using at commands
if installation steps looks difficult to you, then just use the scripts I linked in the first place or contact me: castix at autistci dot org
install socat with opkg
ensure serial interface is available and test it
copy the script. and adjust the parameters on your needs
give executable rights
test it runs
edit the crontab as follows to check every minute and keep a week of logging
* * * * * /root/re_wwan.sh >> /tmp/re_wwan.log 2>&10 3 * * * echo "$(tail -n 10080 /tmp/re_wwan.log)" > /tmp/re_wwan.logfirst of all make sure the ttyUSB device is created.
if it isn't, do
root@OpenWrt:~# lsusbBus 002 Device 001: ID 1d6b:0001 Linux 5.4.154 ohci_hcd Generic Platform OHCI controllerBus 001 Device 005: ID 2020:2033 Mobile Connect Mobile ConnectBus 001 Device 001: ID 1d6b:0002 Linux 5.4.154 ehci_hcd EHCI Host Controllerroot@OpenWrt:~# echo "2020 2033" > /sys/bus/usb-serial/drivers/option1/new_idroot@OpenWrt:~# dmesg | grep ttyUSB[ 25.188754] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB0[ 25.215966] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1[ 25.243125] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2[ 25.270292] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB3it should be clear, take the id of the usb device...
in this case multiple devices have been created, I see only1 and2 are working with at commands
root@OpenWrt:~# echo "ATI" | socat - /dev/ttyUSB1,raw,echo=0,crlf,nonblock,b115200ATIManufacturer: BroadMobiModel: BM806CRevision: M1.2.0_E1.0.1_A1.1.8IMEI: 358289083120524+GCAP: +CGSMOKroot@OpenWrt:~#Sat Mar 19 02:58:02 UTC 2022 ONLINE quality:18,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 02:59:02 UTC 2022 ONLINE quality:18,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)ping: sendto: Network unreachableSat Mar 19 03:00:02 UTC 2022 OFFline. restarting interface. debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:00:11 UTC 2022 ONLINE, it was enough. quality: 18,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:01:02 UTC 2022 ONLINE quality:18,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:02:02 UTC 2022 ONLINE quality:22,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:03:02 UTC 2022 ONLINE quality:18,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:04:02 UTC 2022 ONLINE quality:18,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:05:02 UTC 2022 ONLINE quality:18,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:06:02 UTC 2022 ONLINE quality:18,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:07:02 UTC 2022 ONLINE quality:18,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:08:02 UTC 2022 ONLINE quality:18,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:09:02 UTC 2022 ONLINE quality:17,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:10:02 UTC 2022 ONLINE quality:17,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:11:02 UTC 2022 ONLINE quality:17,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:12:02 UTC 2022 ONLINE quality:17,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:13:02 UTC 2022 ONLINE quality:17,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:14:02 UTC 2022 ONLINE quality:17,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)Sat Mar 19 03:15:02 UTC 2022 ONLINE quality:17,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)ping: sendto: Network unreachableSat Mar 19 03:16:00 UTC 2022 OFFline. restarting interface. debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)ping: sendto: Network unreachableSat Mar 19 03:16:07 UTC 2022 OFFline. reloading kernel moduleSat Mar 19 03:17:02 UTC 2022 ONLINE quality:18,99 debug:(fun 1 | cgreg 0,1 | cgatt 1 | cgact 1,1)as you can see, it was offline at 3:00 I suppose due to an ISP cron.3
at 3:15 instead i issuedrmmod manually to show this log.
removing the module from the kernel doesn't interfere with the serial interface
so you can still see that the module is still saying that the link to the cell is still active.
then it backs online
Thank you if you do
Castix.I also would like to acknowledge rico that made me want to live where wwan is mandatory
GPLv3+
- I see lot of aaaaaaa or ATATATAT on errors and too much whitespaces on success
the baudrate you're using is wrong, try to find the manual for your modem or just try until you guess it
- after some bad command ttyUSB device became weird, doing
file /dev/ttyUSB1gets Killed by the OOM and I can't socat anymore
just dormmod option1 andinsmod option1
Footnotes
ping could also be done trhough at commands, but it didn't work for me↩
through
at+cfun=commands it should be possible to restart the modem, but it didn't work for me (BroadMobi BM806C) and reloading the module have always revived the connection until now↩online with active link uh? seems like a bug of linux kernel module then? or just the crappy modem I have?↩
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simple but effective script to revive wwan modules on openwrt and laptops