Configure TRB142 for direct SMS output

Networking Solutions
1

Hi,

My use case is to connect the TRB142 to an legacy car device, previous solution was a legacy GSM modem but this will be unsupported by the mobile network soon.
SMS should be received and transmitted transparently and immediate using PDU mode. So far this seem to be possible.

We have tried to change the SMS Event Reporting Configuration with command AT+CNMI to activate immediate SMS reporting when a SMS is received. But it did not work.
We want the TRB142 modem to output this indication to our device when an SMS is received.
Short message is output directly to the TE (in PDU mode)
Syntax: +CMT:,
An example is: +CMT: ,26 "

At start the car device (TE) configures the modem (GSM engine ME) with these commands.
ATE Turn on echo
AT+CPIN? Check PIN authentication status
AT+CSMS=1 Select Message Service, compatible with GSM 07.05 Phase 2+ version
AT+CNMI=3,2

CNMI Mode: Forward unsolicited result codes directly to the TE. TA-TE link
specific inband technique used to embed result codes and data
when TA is in on-line data mode.
CNMI Mt: SMS-DELIVERs, except class 2 messages and messages in
the message waiting indication group (store message) are
routed directly to the TE using unsolicited result code

It looks like the TRB142 and EC25&EC21_AT_Commands does not support mode 3. Not sure yet if this is a must for our car device to work. We can configure the car device to use Text mode instead of PDU mode Not sure yet if this makes any difference.

Do you have any other Teltonika device that may support this mode?

Thank you.

3

Greetings, petbar1,

Thank you for reaching out.

We need to perform some additional checks on this case. Our team is currently working on it, and I will update you as soon as we have more details.

Best regards,
V.

4

We got this quite quick response from the reseller. To save time I asked both this forum and the reseller.

Thank you

"We can confirm that the module supports only CNMI modes 0, 1, and 2. Switching to Text mode does not affect this limitation.
From my research, all current Quectel modules do not support mode 3. We have also checked Meig documentation, which confirms that the supported modes are 0, 1, and 2.

AT+CNMI=?

+CNMI: (0,1,2),(0,1,2,3),(0,2),

(0,1,2),(0,1)

We would suggest to try analyzing if car device’s settings could be changed to match modem behavior."

5

Greetings, petbar01,

Thank you for your message,

Could you please confirm, if any additional assistance is still needed?

Kind regards,
V.

6

HI,

thank you for your response, since the mode is not supported we need to solve this in some other way apart from the TRB unit. Our car device just keep on trying to set the config of the TRB to mode 3 since the TRB reports an error back to the car device. This state does not end.

This case can be closed.

Regards Peter

7

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