26.3.7. Finding the
Message Status Values Supported by the +CMGL AT Command in SMS PDU
Mode
As
mentioned earlier, the +CMGL AT command takes one parameter,
message_status. Performing a test operation with the +CMGL AT
command allows you to find all message status values that are
supported by the message_status
parameter. Here is the format of the information response returned
after the execution of the test command "+CMGL=?":
+CMGL:
(list_of_status_values)
In
SMS PDU mode, the values inside the above parentheses are integers.
The SMS specification has defined five message status values: 0, 1,
2, 3 and 4. They are supported by most GSM/GPRS modems and
mobile phones. A description of these five message status values can
be found in the earlier section "Syntax
of the +CMGL AT Command in SMS PDU Mode".
As
an example, here is the response returned from my Nokia 6021 mobile
phone to the HyperTerminal program in Windows after the execution of
the test command "+CMGL=?":
AT+CMGL=?
+CMGL:
(0-4)
OK
From
above, we know that the Nokia 6021 mobile phone supports all of the
five message status values defined
in the SMS specification.
Do
you remember that we described the format of values inside
parentheses in the section "Test
Command -- Checks Whether a Certain AT Command is Supported"?
If not, you may want to go back and have a look. Here are a few
examples showing some of the possibilities: "(0-4)",
"(0,1,2,3,4)", "(0,2-4)".
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