Instructions

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Espressif Systems
ESP8266
AT Instruction Set
Parameters
<link ID> ID of network connection (0~4), used for multi-connection
<type> string, "TCP" or "UDP"
<remote IP> string, remote IP
<remote port> string, remote port
[<UDP local port>] optional, UDP port of ESP8266
[<UDP mode>] optional. In UDP transparent transmission, it has to be 0.
0 : destination peer entity of UDP will not change, default option.
1 : destination peer entity of UDP can change once.
2 : destination peer entity of UDP is allowed to change.
Note: [<UDP mode>] can only be used when [<UDP local port>] is set.
AT+CIPSTART – Function 3: Establish SSL connection
Example
AT+CIPSSLSIZE=4096
AT+CIPSTART="SSL", "iot.espressif.cn", 8443
Single connection
(AT+CIPMUX=0)
AT+CIPSTART=
<type>, <remote IP>, <remote port>[, <TCP keep alive>]
Multiple connection
(AT+CIPMUX=1)
AT+CIPSTART=<link ID>,
<type>, <remote IP>, <remote port>[, <TCP keep alive>]
Response
OK or ERROR
If TCP is already connected, returns
ALREADY CONNECT
Parameters
<link ID> ID of network connection (0~4), used for multi-connection
<type> string, "SSL"
<remote IP> string, remote IP address
<remote port> string, remote port number
[<TCP keep alive>] optional, detection time interval when TCP is kept alive,
this function is closed by default.
0 : disable TCP keep-alive
1 ~ 7200 : detection time interval, unit: second
Espressif Systems  / Friday, July 15, 201656 73