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+WMGO – Message overwriting
The +CMGW writes a SMS to the first free location. To write a SMS to a specified loca-
tion, the +WMGO specific command forces the module to write a SMS (with +CMGW
command) to the location specified with +WMGO, but just for one +CMGW command.
Command syntax:
AT+WMGO= <loc>
<loc> location number of the SIM record to write or overwrite
Possible responses:
OK
if <loc> is a valid SMS location, for AT+WMGO=? and
for AT+WMGO?
+CME ERROR: 21
if <loc> is out of the SIM capacity range.
+WMGO: <loc>
for AT+WMGO?
Then on the next AT+CMGW command, the used record number will be that one specifi-
ed by AT+WMGO command. The location is then forgotten, and to make a second over
writing, the +WMGO shall be used again.
If the external application specifies a free location, and if an incoming message is recei-
ved before the AT+CMGW command, the module may store the incoming message in a
free location, which could be unfortunately the one specified by +WMGO (the module
does not prevent this case). Then if the user issues a AT+CMGW command, without
changing the AT+WMGO location, the new message will be overwritten!
Be aware that this location number is not kept over a software reset.
A complete manual with all AT-commands is available at our web site as a PDF-file
(www.westermo.se)
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