Data Sheet

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5. TCP/IP-Related AT Commands
5.2.3. AT+CIPSTART—Establishes TCP Connection, UDP Transmission or SSL Connection
Establish TCP Connection
Set
Command
Single TCP connection (AT+CIPMUX=0):
AT+CIPSTART=<type>,<remote󰐇IP>,<remote󰐇
port>[,<TCP󰐇keep󰐇alive>]
Multiple TCP Connections (AT+CIPMUX=1):
AT+CIPSTART=<link󰐇ID>,<type>,<remote󰐇
IP>,<remote󰐇port>[,<TCP󰐇keep󰐇alive>]
Response
OK
or
ERROR
If the TCP connection is already established, the response is:
ALREADY󰐇CONNECT
Parameters
•
<link󰐇ID>: ID of network connection (0~4), used for multiple connections.
•
<type>: string parameter indicating the connection type: "TCP", "UDP"󰐇or "SSL".
•
<remote󰐇IP>: string parameter indicating the remote IP address.
•
<remote󰐇port>: the remote port number.
•
[<TCP󰐇keep󰐇alive>]: detection time interval when TCP is kept alive; this function is disabled by
default.
‣ 0: disable TCP keep-alive.
‣ 1󰐇~󰐇7200: detection time interval; unit: second (s).
Examples
AT+CIPSTART="TCP","iot.espressif.cn",8000
AT+CIPSTART="TCP","192.168.101.110",1000
For more information please see: ESP8266 AT Command Examples.
Establish UDP Transmission
Set
Command
Single connection (AT+CIPMUX=0):
AT+CIPSTART=<type>,<remote󰐇IP>,<remote󰐇port>[,
(<UDP󰐇local󰐇port>),(<UDP󰐇mode>)]
Multiple connections (AT+CIPMUX=1):
AT+CIPSTART=<link󰐇ID>,<type>,<remote󰐇
IP>,<remote󰐇port>[,(<UDP󰐇local󰐇port>),
(<UDP󰐇mode>)]
Response
OK
or
ERROR
If the UDP transmission is already established, the response is:
ALREADY󰐇CONNECT
Espressif
! /!43 58
2017.05