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This command can be used in the transparent transmission of external/internal
protocol stack and CSD function.
This command should not end with \r or \n.
4.4 Switching Command Mode to Data Mode: ATO
To switch the module from the command mode to the data mode
CONNECT
CONNECT <text>
NO CARRIER
ERROR
CONNECT is returned in TCP/UDP transparent transmission
mode and TCP server transparent transmission mode.
OK is returned after the mode is switched to data mode
successfully in external protocol dialing.
CONNECT 9600 is returned after the module is switched to
data mode successfully during the operation of CSD function.
ERROR is returned because no transparent transmission link
is set up or no external protocol is used for dial-up internet
access.
This command is used to switch the command mode to the data mode for dial-
up connection through external protocol stack and transparent transmission
through internal protocol stack.
Commands mode is switched to data mode during the operation of CSD
function.
4.5 Setting Network APN: +NETAPN