Instructions

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Espressif Systems
ESP8266
AT Instruction Set
5.2.
TCP/IP
1.
AT+CIPSTATUS – Check network connection status
2.
AT+CIPDOMAIN – DNS function
ESP8266 needs to connect to a router to access to the internet first, then it is able to call the DNS
function.!
AT+CIPSTATUS – Check network connection status
Command
AT+CIPSTATUS
Response
STATUS:<stat>
+CIPSTATUS:<link ID>, <type>, <remote_IP>, <remote_port>, <local_port>,
<tetype>
Parameters
<stat> status of ESP8266 station interface
2 : ESP8266 station connected to an AP and has obtained IP
3 : ESP8266 station created a TCP or UDP transmission
4 : the TCP or UDP transmission of ESP8266 station disconnected
5 : ESP8266 station did NOT connect to an AP
<link ID> ID of the connection (0~4), for multi-connect
<type> string, "TCP" or "UDP"
<remote_IP> string, remote IP address
<remote_port> remote port number
<local_port> ESP8266 local port number
<tetype>
0 : ESP8266 runs as client
1 : ESP8266 runs as server
AT+CIPDOMAIN – DNS function
Example
AT+CWMODE=1 // Set station mode
AT+CWJAP="SSID","password" // access to the internet
AT+CIPDOMAIN="iot.espressif.cn" // DNS function
Command
AT+CIPDOMAIN=<domain name>
Response
+CIPDOMAIN:<IP address>
Parameters
<domain name> the domain name
Espressif Systems  / Friday, July 15, 201654 73