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UDP/TCP.
Default is TCP，if you want to change
into UDP，Send SMS"123456gprsmode 1"
to unit，if you want change back to TCP,
send SMS"123456gprsmode 0".
Version.
Send SMS"123456version"to unit ，it
will reply version information
Reset.
Send SMS"123456begin"to unit, it will
reply"begin ok!", then unit will back to
default settings.
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