Delivery status notification in PDU mode +CDS

+CDS notifies of an unsolicited delivery status in Protocol Data Unit (PDU) mode. Terminal Equipment (TE) is expected to ack received delivery report with AT+CNMA.

The notification is subscribed using the +CNMI command.

Syntax:

+CDS: <length><CR><LF><pdu>

The notification parameters and their defined values are the following:

<length>
Number of hexadecimal octets in <pdu>. 1–3 ASCII digits.
<pdu>
Hexadecimal numbers containing two International Reference Alphabet (IRA) characters per octet.

The example returns a delivery status notification with the recipient address, service center timestamp, and message delivery time:

+CDS: 25<CR><LF>060C91534810325476171160316255001711603152120000
OK