LTE "not running" with no internet

RouterOS Beginner Basics
1

ROS 6.47beta35. LM940 modem. Routerboard RBLHGR.

Steps taken:

  • Modem set to usb2.0
  • Modem in LTE mode (and ROS reading it)
    -Using same APNs in this modem as the last with the same sim card
    -LTE is enabled

ISSUE:
-No internet
-LTE1 is “not running”
-Registration Status: searching

I have found these errors in the log:

Buffer lte
Topics lte
error Message SXTR_LTE: lte1 SMS storage set failed ( I do not have a SXTR_LTE. )



Topics lte async: Message SXTR_LTE: lte1: rcvd +CME ERROR: operation not supported

I don’t know what else to check.

I need to enter AT commands via serial port and ROS
2

Please do reboot
wait 2minutes to grab logs
Run writing logs to file by:
/log print file=“logs.txt”
Add this file to forum.

PS. Please not create any more new post at forum.

3

At start disable the GSM network, the LM940 not support that ! 3G and 4G only are support. ROS command:
/interface lte set lte1 network-mode=3g,lte
Maybe that ROS try enable GSM=2G who is not supported create you a problem.

At LM940 AT command manual I see that commands and Telit post (https://www.telit.com/technical-forum/operation-not-allowed/) who describe what to check:

Page 66, SIM/PIN status by
/interface lte at-chat lte1 input=“AT+CPIN?”

Page 55, Registration in network by
“enable network registration unsolicited result code”
/interface lte at-chat lte1 input=“AT+CREG=1”

+CREG:
Where:

0 - not registered, ME is not currently searching a new operator to register to
1 - registered, home network
2 - not registered, but ME is currently searching a new operator to register to
3 - registration denied
4 - unknown
5 - registered, roaming

Wait some time and repeat by
/interface lte at-chat lte1 input=“AT+CREG?”

+CREG: 0,2 (the MODULE is in network searching state)
+CREG: 0,1 (the MODULE is registered)

Page 198, Serving Cell Information, After registration try this:
/interface lte at-chat lte1 input=“AT#SERVINFO”

Good Luck and give feedback, and LOGs in file

4

Here is the log


logs.txt (15.6 KB)

5

i have been facing the same issue. this is what helped me:

  • remove the SIM card from Mikrotik device
  • put the SIM card to some other device.
  • delete all SMS messages on SIM card using the other device
  • put the SIM card back to Mikrotik

seems to be some bug in MikrotikOS.

6

Full HowTo for Telit 940/960 we done here: http://forum.mikrotik.com/t/telit-lm940-how-to-get-working/127619/1