Anyone manage to send a SMS-COMMAND PDU using AT command?
AT+CMGS in PDU mode seems to only support SMS-SUBMIT PDU.
Any sample AT sequence to send SMS-COMMAND would be appreciated.
I have tried the following sequence and it ends with error.
+CMS ERROR: 350
From what I can see, +CMS ERROR: 350 is likely to mean the SMS command is being rejected by the message centre, and not by the modem.
I am not sure who rejects it.
What we intend to do is to send a SMS-COMMAND out to query the status of a submitted short message (using SMS-SUBMIT PDU) which was not delivered yet to phone by SMSC. In the SMS-SUBMIT PDU the delivery report flag has been set.
Or perhaps there is a better way to query SMSC on undelivered short message?
Tried out with AT+CMGC, it ends with ERROR also.
That’s a good point, AT+CMGC seems to be the correct AT command for this.
According to 3GPP 23.040, section 9.2.2:
SMS-SUBMIT, conveying a short message from the MS to the SC
SMS-COMMAND, conveying a command from the MS to the SC
Not all SMSCs support delivery reports (the TP-SRI bit is ignored). They may not support SMS commands of any TP-CT value.
Do delivery reports normally work with the network you’re using?
If TP-SRR is set in SMS-SUBMIT, a delivery report will be received when SMS is delivered to final destination.