Can also edit and add commonly used AT commands with \r as the terminator.
Click the corresponding button to send "+++", the module responds with "a" and then
clicks to send "a". After the module returns "+ok", it enters the command mode.
After entering the command mode, the module can send commands, and the data input
by the main interface will be sent out immediately. The displayed data is echoed. The data in
the lower command bar will be sent only after pressing the Enter key (It needs to be displayed
after the tool is enabled.) The data sent in the command bar is marked with a carriage return,
so there is no need to add "\r" as the button bar.