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| Supported Targets | ESP32 | ESP32-S2 | ESP32-S3 | ESP32-C3 |
| ----------------- | ----- | -------- | -------- | -------- |
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# Asio TCP echo server example
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Simple Asio TCP echo server using WiFi STA or Ethernet.
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## Example workflow
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- Wi-Fi or Ethernet connection is established, and IP address is obtained.
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- Asio TCP server is started on port number defined through the project configuration.
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- Server receives and echoes back messages transmitted from client.
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## Running the example
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- Open the project configuration menu (`idf.py menuconfig`) to configure Wi-Fi or Ethernet. See "Establishing Wi-Fi or Ethernet Connection" section in [examples/protocols/README.md ](../../README.md ) for more details.
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- Set server port number in menuconfig, "Example configuration".
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- Run `idf.py -p PORT flash monitor` to build and upload the example to your board and connect to it's serial terminal.
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- Wait for the board to connect to WiFi or Ethernet (note the IP address).
- You can now send a TCP message and check it is repeated, for example using netcat `nc IP PORT` .
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See the README.md file in the upper level 'examples' directory for more information about examples.