[ESP32 Only] Ethernet AT Examples¶

Note

Before you run any Ethernet AT commands, please make sure you have followed the Prerequisite.

Establish a TCP Connection on Ethernet Network¶

Obtain the IP address of the server.

Response

+CIPETH:ip:192.168.105.24
+CIPETH:gateway:192.168.105.1
+CIPETH:netmask:255.255.255.0
OK

Use a network tool on PC to create a TCP client and connect to the TCP server that ESP created. (IP: 192.168.105.24, Port: 8081).
Send data in Normal Transmission Mode.
- Command
```
AT+CIPSEND=0,4    // send 4 bytes to connection ID 0
```
- Response
```
OK
>
```
- Enter the data.
- Response
```
SEND OK
```
Note: If the length of the data you entered is more than the value of <length> (n) set by AT+CIPSEND, the system will prompt busy, and send the first n bytes. After sending the first n bytes, the system will reply SEND OK.
Receive data in Normal Transmission Mode.

When the ESP server receives data, AT will prompt:
```
+IPD,n:xxxxxxxxxx    // received n bytes, data=xxxxxxxxxxx
```
Close TCP Connection.
- Command
```
AT+CIPCLOSE=0
```
- Response
```
OK
```
Delete the TCP server.
- Command
```
AT+CIPSERVER=0
```
- Response
```
OK
```