ESP8266 长连接教程：使用 AT+CIPSTART 命令建立 TCP 连接

To establish a long connection using ESP8266, you can use the AT+CIPSTART command to initiate the TCP connection. Here's an example:

1. Set the Wi-Fi mode: AT+CWMODE=1
2. Connect to Wi-Fi network: AT+CWJAP="SSID","Password"
3. Start TCP connection: AT+CIPSTART="TCP","IP Address",Port
   • Replace "IP Address" with the IP address of the server you want to connect to.
   • Replace "Port" with the port number of the server.

Once the connection is established, you can send/receive data using AT+CIPSEND and AT+CIPRECV commands.

To maintain the long connection, you need to periodically send data or use the AT+CIPRECVDATA command to check for incoming data. This will prevent the connection from being closed due to inactivity.

Remember to configure the ESP8266 as a server on the other end if you want to receive data from the ESP8266.