entering AT command mode, please refer to this FAQ: http://www.usriot.com/enter-serial-command-mode/.
3.3.2.Network AT command mode
Network AT command is to send a search keyword by UDP broadcast, then set the parameters in a single
broadcast way(If user wants to use network AT command, module and PC which send the network AT command
must in same network segment). Default keyword is www.usr.cn and default port number is 48899. If user
enters network AT command mode but don’t send any command over 30 seconds, module will exit network AT
command mode. User can enter network AT command mode as follow way:
Figure 16 Network AT command mode
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