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70 lines
2.6 KiB
Markdown
70 lines
2.6 KiB
Markdown
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# TCP Client example
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(See the README.md file in the upper level 'examples' directory for more information about examples.)
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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.
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## How to use example
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In order to create TCP server that communicates with TCP Client example, choose one of the following options.
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There are many host-side tools which can be used to interact with the UDP/TCP server/client.
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One command line tool is [netcat](http://netcat.sourceforge.net) which can send and receive many kinds of packets.
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Note: please replace `192.168.0.167 3333` with desired IPV4/IPV6 address (displayed in monitor console) and port number in the following command.
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In addition to those tools, simple Python scripts can be found under sockets/scripts directory. Every script is designed to interact with one of the examples.
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### TCP server using netcat
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```
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nc -l 192.168.0.167 3333
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```
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### Python scripts
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Script example_test.py could be used as a counter part to the tcp-client project, ip protocol name (IPv4 or IPv6) shall be stated as argument. Example:
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```
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python example_test.py IPv4
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```
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Note that this script is used in automated tests, as well, so the IDF test framework packages need to be imported;
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please add `$IDF_PATH/tools/ci/python_packages` to `PYTHONPATH`.
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## Hardware Required
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This example can be run on any commonly available ESP32 development board.
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## Configure the project
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```
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idf.py menuconfig
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```
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Set following parameters under Example Configuration Options:
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* Set `IP version` of example to be IPV4 or IPV6.
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* Set `IPV4 Address` in case your chose IP version IPV4 above.
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* Set `IPV6 Address` in case your chose IP version IPV6 above.
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* Set `Port` number that represents remote port the example will connect to.
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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.
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## Build and Flash
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Build the project and flash it to the board, then run monitor tool to view serial output:
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```
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idf.py -p PORT flash monitor
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```
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
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## Troubleshooting
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Start server first, to receive data sent from the client (application).
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