User Manual

! ! " !

Espressif Systems

ESP8266

AT Command Examples

Note:

When ESP8266 is working as a TCP server, there exists a timeout mechanism. If the TCP client is

connected to the ESP8266 TCP server, whereas there is no data transmission for a period of time,

then the server will stop the connection with the client. To avoid such problems, please set up a data

transmission circulation every 5 seconds.

•

Send data:

// ID number of connection is defaulted to be 0.

AT+CIPSEND=0, 4 // send 4 bytes to connection NO.0

>iopd // enter the data, no CR

Response :SEND OK

Note:

If the number of bytes sent is bigger than the size deﬁned (n), will reply busy, and after sending n

number of bytes, reply SEND OK.

•

Receive data:

+IPD, 0, n: xxxxxxxxxx // received n bytes, data = xxxxxxxxxx

•

Delete one TCP connection:

AT+CIPCLOSE=0 // Delete NO.0 connection.

Response :0, CLOSED OK

Espressif Systems Conﬁdential  / Friday, Oct 23, 201515 16