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at-command
Bayakaa Lkhamaa
Bayakaa Lkhamaa

Reputation: 1

How can I solve at+cmss command returning error?

I am trying to send a sms from a gsm modem using AT command.

I ve tried following command

AT
OK

AT+CMGF=1
OK

AT+CMGW="+85291234567"

A simple demo of SMS text messaging.

+CMGW: 1

OK
AT+CMSS=1

But last line at+cmss=1 command returns error, how can I solve it?

Upvotes: 0

Views: 816

Answers (1)

Roberto Caboni
Roberto Caboni

Reputation: 7490

Command +CMSS=<pos> sends a message previouly stored memory in position through +CMGW command. This command can fail for plenty reasons, all basically related to trasmission issues. I cannot solve your problem, but I can provide a list of things to check in order to understand the reason of any network related operation failure:

  1. Is the antenna connected? (who knows..)
  2. Is the device registered to the network? Issue AT+CREG? and check the returned answer. +CREG: x,1 and +CREG: x,5mean respectively that the device is registered to the home network or in roaming. Otherwise the registration is either still in progress or failed for some reason.
  3. Has the Service Center number correctly been stored with AT+CSCA command?
  4. Is the destination number correct?

Temporary network issues for your operator (not due to your device) can also lead to a SM sending failure.

But the universal attempt to be done during development phase is the verbose response enabling. Issue 'AT+CMEE=2' before the section where you get an error, and instead a generic ERROR response you will get something like +CMS ERROR: <err>, where will describe the failure reason. Check the AT command user guide of the manufacturer of your modem in order to learn more about the error code you get.

Upvotes: 2

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