| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C6 | ESP32-S2 | ESP32-S3 | Linux | | ----------------- | ----- | -------- | -------- | -------- | -------- | -------- | ----- | # TCP Client example (See the README.md file in the upper level 'examples' directory for more information about examples.) The application creates a TCP socket and tries to connect to the server with predefined IP address and port number. When a connection is successfully established, the application sends message and waits for the answer. After the server's reply, application prints received reply as ASCII text, waits for 2 seconds and sends another message. ## Configure the project This example can be configured to run on ESP32 and Linux target to communicate over IPv4 and IPv6. ``` idf.py menuconfig ``` Set following parameters under ```Example Configuration``` Options: * Set `IP version` of example to be IPV4 or IPV6. * Set `IPV4 Address` in case your chose IP version IPV4 above. * Set `IPV6 Address` in case your chose IP version IPV6 above. * For IPv6 there's an additional option for ```Interface selection```. * Enter the name of the interface to explicitely establish communication over a specific interface. * On selecting ```Auto``` the example will find the first interface with an IPv6 address and use it. * Set `Port` number that represents remote port the example will connect to. Configure Wi-Fi or Ethernet under "Example Connection Configuration" menu. See "Establishing Wi-Fi or Ethernet Connection" section in [examples/protocols/README.md](../../README.md) for more details. Note: please replace `192.168.0.167 3333` with desired IPV4/IPV6 address (displayed in monitor console) and port number in the following command. ## How to use example: In order to create TCP server that communicates with TCP Client example, choose one of the following options. There are many host-side tools which can be used to interact with the UDP/TCP server/client. One command line tool is [netcat](http://netcat.sourceforge.net) which can send and receive many kinds of packets. Ref to the [upper level README](../README.md#host-tools) for more information. ### TCP server using netcat ``` nc -l 192.168.0.167 3333 ``` ## Hardware Required This example can be run on any commonly available ESP32 development board. This example can also run on any Linux environment. ## Build and Flash Build the project and flash it to the board, then run monitor tool to view serial output: ``` idf.py -p PORT flash monitor ``` (To exit the serial monitor, type ``Ctrl-]``.) See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects. ## Troubleshooting Start server first, to receive data sent from the client (application).