Udp (With Changeable Remote Ip And Port) - Espressif ESP32 At Instruction Set

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�� Notes:
"192.168.101.110" and 8080 are the remote IP and port of UDP transmission on the remote side, i.e., the UDP
•
configuration set by PC.
• 1112 is the local port number of ESP32. Users can define this port number. The value of this parameter will be random if
it is not defined beforehand.
0 means that the remote IP and port are fixed and cannot be changed. For example, if another PC also creates a UDP
•
entity and sends data to ESP32 port 1112, ESP32 can receive the data sent from UDP port 1112. But when data are
sent using AT command AT+CIPSEND=4,X, it will still be sent to the first PC end. If parameter 0 is not used, the data will
be sent to the new PC.
3. Send data:
AT+CIPSEND=4,5 // send 5 bytes to transmission NO.4
>DGFYQ // enter the data, no CR
Response:
SEND OK
⚠ Notice:
If the number of bytes sent is bigger than the size defined as n, the response would be busy. After sending the first n
number of bytes, SEND OK will be returned.
4. Receive data:
+IPD,4,n:xxxxxxxxxx // received n bytes, data=xxxxxxxxxxx
5. Close UDP transmission No.4:
AT+CIPCLOSE=4
Response:
4,CLOSED
OK
7.2.2.

UDP (with Changeable Remote IP and Port)

1. Create a UDP transmission with the last parameter being 2.
AT+CIPSTART="UDP","192.168.101.110",8080,1112,2
Response:
CONNECT
OK
Espressif 38 53 ! /!
7. AT Commands Examples
2017.02