Ebyte E840-DTU User Manual page 12

GPRS
Return：<CR><LF>+OK<CR><LF>
Parameter： baudrate
Parity Parity
Description：None
AT+UARTCLR
Function： Query/set whether the serial port cache is cleared before module is connected
Format： Query
TX：AT+ UARTCLR <CR>
return：<CR><LF>+OK=< sta ><CR><LF>
Set
TX：AT+ UARTCLR =< sta ><CR>
return：<CR><LF>+OK<CR><LF>
Parameters: sta state
ON
OFF The serial port cache is not cleared before the connection.
AT+MAC
Function： Query MAC
Format： Query
TX：AT+MAC<CR>
Return：<CR><LF>+OK=<mac><CR><LF>
Parameter： mac MAC address
AT+IMEI
Function： Query IMEI
Format： Query
TX：AT+IMEI<CR>
Return：<CR><LF>+OK=<imei><CR><LF>
Parameter： imei IMEI code
AT+LINKSTA
Function： Query whether TCP link is connected
Format： Query
TX：AT+LINKSTA<CR>
Return：<CR><LF>+OK=<sta><CR><LF>
Parameter： Sta whether TCP link connection is established，Connect(TCP connection)/ Disconnect(TCP cut off)
AT+LINKSTA1
Function： Query whether TCP link is connected
Format： Query
TX：AT+LINKSTA1<CR>
Return：<CR><LF>+OK=<sta><CR><LF>
Parameter： Sta whether TCP link connection is established，Connect(TCP connection)/ Disconnect(TCP cut off)
AT+LINKSTA2
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Baud rate 1200~921600bps，can be self defined
NON no parity
EVEN even parity
ODD odd parity
Clear the serial port cache before connecting.
E840-DTU（GPRS-03）User Manual