QUECTEL EP06 LTE modem falls to offline spontaneously

Omnia hardware Omnia HW problems
1

Hello, I have an issue with QUECTEL EP06 LTE modem. It works even in failover scenario as a backup WAN (mwan3), but cca 1x per day it falls to offline spontaneously and it seems there is no way except router reboot to make it functional again.

My config:

config interface ‘lte’
option proto ‘3g’
option apn ‘internet’
option device ‘/dev/ttyUSB2’
option service ‘umts’
option ipv6 ‘auto’
option metric ‘50’
option pincode ‘3639’
option force_link ‘1’

After it falls to offline, it says:

root@turris:/etc/config# ifstatus lte
{
“up”: false,
“pending”: false,
“available”: true,
“autostart”: false,
“dynamic”: false,
“proto”: “3g”,
“data”: {

},
"errors": [
	{
		"subsystem": "3g",
		"code": "PIN_FAILED"
	}
]

}

/var/log/messages says after “ifup lte” command:

Sep 28 12:43:09 turris netifd: Interface ‘lte’ is setting up now
Sep 28 12:43:09 turris netifd: lte (23472): comgt 14:43:09 → – Error Report –
Sep 28 12:43:09 turris netifd: lte (23472): comgt 14:43:09 → ----> ^
Sep 28 12:43:09 turris netifd: lte (23472): comgt 14:43:09 → Error @118, line 9, Could not write to COM device. (1)
Sep 28 12:43:09 turris netifd: lte (23472):
Sep 28 12:43:10 turris netifd: lte (23472): comgt 14:43:10 → – Error Report –
Sep 28 12:43:10 turris netifd: lte (23472): comgt 14:43:10 → ----> ^
Sep 28 12:43:10 turris netifd: lte (23472): comgt 14:43:10 → Error @153, line 10, Could not write to COM device. (1)
Sep 28 12:43:10 turris netifd: lte (23472):
Sep 28 12:43:10 turris netifd: Interface ‘lte’ is now down

Card has pin set off (when put into mobile phone, it boots without PIN code)

Any help? Thank you!

2

If the pin is disabled delete the line in config related to pin. Maybe that will help.

3

My problems with EC20 originated from the sim card holder and rarely from the modem itself.
So I suggest that you also look at the sim card when you experience the issue.
I suggest to use qmicli for this
/usr/bin/qmicli -d /dev/cdc-wdm0 --uim-get-card-status

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4

Line deteted, but modem still fails to offline time by time (cca 1x per 2 days). Can this be HW problem or firmware update needed? Is it possible to update FW under Open WRT? Thank you.

5

It seems there were more issues. SIM PIN deactivation helped, but it seems there is network connection limit set ro 48h (O2 CZ) what causes periodical disconnects after 2 days. But unfortunately I haven’t found way how to make modem online via script (ifup lte, uqmi….), only router restart helps :-/

6

I was using these commands in a script for EC20. I know that others use AT commands in a script (based on quectel AT commands manual for the modem) to initialize the modem.

Summary 
#!/bin/sh

#Ping DNS server twice through Lte, should ping fail, test ip, protocol and card state
/usr/bin/ping -c2 -w 5 -I wwan0 8.8.8.8 >/dev/null 2>&1 && { logger "Lte DNS ping success"; exit 2; } || { ifup Lte; sleep 10; logger "Ping failed"; }

#Check IPv4 and exit on success
/usr/bin/qmicli -d /dev/cdc-wdm0 --wds-get-current-settings >/dev/null 2>&1 && { logger "IPv4 present"; exit 3; }

#Qmi protocol test, if it fails use AT command to reset the modem and bring up the interface
/usr/bin/qmicli -d /dev/cdc-wdm0 --dms-uim-get-state >/dev/null 2>&1 && { logger "Qmi proto test success"; } || { ifdown Lte; sleep 2; echo -e "AT+CFUN=1,1" > /dev/ttyUSB2; sleep 28; ifup Lte; logger "Reseting modem"; sleep 3; }

# Sim card power state test, if it fails power on sim card and bring up the interface
/usr/bin/qmicli -d /dev/cdc-wdm0 --uim-get-card-status | grep "Card state: 'present'" >/dev/null 2>&1 && { logger "Sim test success"; exit 5; } || { ifdown Lte; sleep 2; /usr/bin/qmicli -d /dev/cdc-wdm0 --uim-sim-power-on=1 >/dev/null 2>&1; sleep 10; ifup Lte; logger "Powering on Sim"; }

# Try to repower Sim card if first attempt fails
/usr/bin/qmicli -d /dev/cdc-wdm0 --uim-get-card-status | grep "Card state: 'present'" >/dev/null 2>&1 && { logger "Sim test No2 success"; exit 6; } || { ifdown Lte; sleep 2; /usr/bin/qmicli -d /dev/cdc-wdm0 --uim-sim-power-on=1 >/dev/null 2>&1; sleep 10; ifup Lte; logger "Powering on Sim 2nd attempt"; }

exit 0
1 Like