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Hello,

New RT950 user (RUT9XX_R_00.06.07.5), I try do deal with this... I tried to find the best place for the router. I had no disconnection for more than two days but issue came back.

What I alreay tried/checked : 

- manual APN

- check if SIM is effectively working by putting it on a phone

- check if Force LTE network is disabled  

- check if Mobile Data On Demand is disabled

- follow this -> https://wiki.teltonika-networks.com/view/Mobile_Data_Connection_Troubleshooting but I don't understand why I have to disable ppp as I chose qmi (connection type : qmi) for my SIM (??)

To have a better view/debug, I monitor data connection status, rssi, rsrp, rsrq and sinr in my home automation system (domoticz) using curl commands (gsmctl)

Disconnect happened today between 11:30 AM and 12:00 PM

Here is the graph (red circled is when disconnect has been detected) 

RSSI : 

 

RSRP :

RSRQ :

SINR :

-> You think disconnect is due to signal strength ?

-> Why, when I reboot router (or restart modem), I'm reconnected ? As I have noticeably the same signal values  

-> What can I do to solve this issue ?

More debug info (currently I only have one sim - SIM1): 

~# uci show simcard

simcard.sim1=sim1

simcard.sim1.reconnect='5'

simcard.sim1.ltebandval='1a0000800d5'

simcard.sim1.bandval='ffff'

simcard.sim1.ifname='wwan0'

simcard.sim1.proto='qmi2'

simcard.sim1.service='auto'

simcard.sim1.pdptype='1'

simcard.sim1.mtu='1500'

simcard.sim1.method='nat'

simcard.sim1.auto_apn='0'

simcard.sim1.force_apn='-1'

simcard.sim1.apn='sl2sfr'

simcard.sim1.auth_mode='none'

simcard.sim2=sim2

simcard.sim2.reconnect='5'

simcard.sim2.ltebandval='1a0000800d5'

simcard.sim2.bandval='ffff'

simcard.sim2.auto_apn='1'

simcard.sim2.pincode='0000'

simcard.sim2.ifname='wwan0'

simcard.sim2.proto='qmi2'

simcard.sim2.service='auto'

simcard.sim2.pdptype='1'

simcard.ppp=interface

simcard.ppp.demand='10'

simcard.option=option

simcard.rules=rules

simcard.bands=bands

simcard.bands.auto_sim1='enable'

simcard.bands.auto_sim2='enable'

simcard.simcard=simcard

simcard.simcard.default='sim1'

logread when disconnected

Thu Feb  4 15:46:46 2021 user.notice /sbin/ndisconn.sh: NDIS connection inactive (). Starting connection

Thu Feb  4 15:46:46 2021 local1.info gsmd[6445]: gsmd send: 'AT+CGDCONT=1,"IP"' (18)

Thu Feb  4 15:46:47 2021 local1.info gsmd[6445]: gsmd get: 'OK' (2)

Thu Feb  4 15:46:47 2021 local1.info gsmd[6445]: gsmd send: 'AT+CGDCONT=16,"IP"' (19)

Thu Feb  4 15:46:47 2021 local1.info gsmd[6445]: gsmd get: 'OK' (2)

Thu Feb  4 15:46:47 2021 local1.info gsmd[6445]: gsmd send: 'AT+CGDCONT=2' (13)

Thu Feb  4 15:46:47 2021 local1.info gsmd[6445]: gsmd get: 'OK' (2)

Thu Feb  4 15:46:50 2021 local1.info gsmd[6445]: gsmd send: 'AT^NDISDUP=1,1,"sl2sfr","","",0' (32)

Thu Feb  4 15:46:50 2021 local1.info gsmd[6445]: gsmd get: 'ERROR' (5)

Thu Feb  4 15:47:00 2021 user.notice /sbin/ndisconn.sh: NDIS connection inactive (). Starting connection

Thu Feb  4 15:47:00 2021 local1.info gsmd[6445]: gsmd send: 'AT+CGDCONT=1,"IP"' (18)

Thu Feb  4 15:47:00 2021 local1.info gsmd[6445]: gsmd get: 'OK' (2)

Thu Feb  4 15:47:00 2021 local1.info gsmd[6445]: gsmd send: 'AT+CGDCONT=16,"IP"' (19)

Thu Feb  4 15:47:00 2021 local1.info gsmd[6445]: gsmd get: 'OK' (2)

Thu Feb  4 15:47:00 2021 local1.info gsmd[6445]: gsmd send: 'AT+CGDCONT=2' (13)

Thu Feb  4 15:47:00 2021 local1.info gsmd[6445]: gsmd get: 'OK' (2)

Thu Feb  4 15:47:03 2021 local1.info gsmd[6445]: gsmd send: 'AT^NDISDUP=1,1,"sl2sfr","","",0' (32)

Thu Feb  4 15:47:03 2021 local1.info gsmd[6445]: gsmd get: 'ERROR' (5)

logread when after modem stop/starthttps://pastebin.com/x1DpiR8R 

A workaround is to crontab a script to stop/start when data mobile id disconnected but it's dirty and should be managed by the router himself

Thanks for your help ! :-)

1 Answer

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Hello.

I recommend reading this article. You can also see the connection quality parameters in the System-> Network-> Mobile menu.

Regards.

by
Igor,

Thanks. I know this article. This is my current reference ;-) I baught a lowcostmobile antenna. Hope it will helps !