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

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Response:
4,CONNECT
OK
�� 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
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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
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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=4,7 // send 7 bytes to transmission NO.4
>UDPtest // enter the data, no CR
Response:
SEND OK
⚠ Notice:
If the number of bytes inputted are more than the size defined (n):
•
-
-
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
9.2.2.

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
the system will reply busy, and send the first n bytes.
and after sending the first n bytes, the system will reply SEND OK.
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9. AT Commands Examples
2019.06