mirror of
https://github.com/espressif/esp-idf.git
synced 2025-11-04 06:11:06 +00:00
74 lines
3.2 KiB
Markdown
74 lines
3.2 KiB
Markdown
| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 |
|
|
| ----------------- | ----- | -------- | -------- | -------- | -------- | --------- | -------- | -------- | -------- | -------- |
|
|
|
|
|
|
# TCP non-blocking client and server examples
|
|
|
|
(See the README.md file in the upper level 'examples' directory for more information about examples.)
|
|
|
|
The application aims to demonstrate a simple use of TCP sockets in a nonblocking mode.
|
|
It could be configured to run either a TCP server, or a TCP client, or both, in the project configuration settings.
|
|
|
|
## How to use example
|
|
|
|
The example is configured by default as the TCP client.
|
|
|
|
Note that the example uses string representation of IP addresses and ports and thus
|
|
could be used on both IPv4 and IPv6 protocols.
|
|
|
|
### TCP Client
|
|
|
|
In the client mode, the example connects to a configured hostname or address, sends the specified payload data and waits for a response,
|
|
then closes the connection. By default, it connects to a public http server and performs a simple http `GET` request.
|
|
|
|
### TCP Server
|
|
|
|
The server example creates a non-blocking TCP socket with the specified port number and polls till
|
|
a connection request from the client arrives.
|
|
After accepting a request from the client, a connection between server and client is
|
|
established, and the application polls for some data to be received from the client.
|
|
Received data are printed as ASCII text and retransmitted back to the client.
|
|
|
|
The server could listen on the specified interface (by the configured bound address) and serves multiple clients.
|
|
It resumes to listening for new connections when the client's socket gets closed.
|
|
|
|
## Hardware Required
|
|
|
|
This example can be run on any commonly available ESP32 development board.
|
|
|
|
## Configure the project
|
|
|
|
```
|
|
idf.py menuconfig
|
|
```
|
|
|
|
Set following parameters under Example Configuration Options:
|
|
|
|
* Set `EXAMPLE_TCP_SERVER` to use the example as a non-blocking TCP server
|
|
* Configure `EXAMPLE_TCP_SERVER_BIND_ADDRESS` to a string representation of the address to bind the server socket to.
|
|
* Configure `EXAMPLE_TCP_SERVER_BIND_PORT` to the port number.
|
|
|
|
* Set `EXAMPLE_TCP_CLIENT` to use the example as a non-blocking TCP client
|
|
* Configure `EXAMPLE_TCP_CLIENT_CONNECT_ADDRESS` to a string representation of the address to connect the client to.
|
|
* Configure `EXAMPLE_TCP_CLIENT_CONNECT_PORT` to the port number.
|
|
|
|
* 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.
|
|
|
|
## 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
|
|
|
|
Follow the same troubleshooting instruction as for the standard [TCP sever](../tcp_server/README.md) and the [TCP client](../tcp_client/README.md),
|
|
using the host tools and scripts as described in the upper level documentation on [BSD socket examples](../README.md).
|