mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
85 lines
2.5 KiB
Markdown
85 lines
2.5 KiB
Markdown
|
|
# UDP Client example
|
|
|
|
(See the README.md file in the upper level 'examples' directory for more information about examples.)
|
|
|
|
The application creates UDP socket and sends message to the predefined port and IP address. After the server's reply, the application prints received reply as ASCII text, waits for 2 seconds and sends another message.
|
|
|
|
## How to use example
|
|
|
|
In order to create UDP server that communicates with UDP 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.
|
|
Note: please replace `192.168.0.167 3333` with desired IPV4/IPV6 address (displayed in monitor console) and port number in the following commands.
|
|
|
|
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.
|
|
|
|
### Send UDP packet via netcat
|
|
```
|
|
echo "Hello from PC" | nc -w1 -u 192.168.0.167 3333
|
|
```
|
|
|
|
### Receive UDP packet via netcat
|
|
```
|
|
echo "Hello from PC" | nc -w1 -u 192.168.0.167 3333
|
|
```
|
|
|
|
### UDP server using netcat
|
|
```
|
|
nc -u -l 192.168.0.167 -p 3333
|
|
```
|
|
|
|
### Python scripts
|
|
Script udpserver.py contains configuration for port number and IP version (IPv4 or IPv6) that has to be altered to match the values used by the application. Example:
|
|
|
|
```
|
|
IP_VERSION = 'IPv4'
|
|
PORT = 3333;
|
|
```
|
|
|
|
## Hardware Required
|
|
|
|
This example can be run on any commonly available ESP32 development board.
|
|
|
|
## Configure the project
|
|
|
|
```
|
|
make menuconfig
|
|
```
|
|
|
|
Set following parameter under Serial Flasher Options:
|
|
|
|
* Set `Default serial port`.
|
|
|
|
Set following parameters under Example Configuration Options:
|
|
|
|
* Set `WiFi SSID` of the Router (Access-Point).
|
|
|
|
* Set `WiFi Password` of the Router (Access-Point).
|
|
|
|
* 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.
|
|
|
|
* Set `Port` number that represents remote port the example will send data and receive data from.
|
|
|
|
## Build and Flash
|
|
|
|
Build the project and flash it to the board, then run monitor tool to view serial output:
|
|
|
|
```
|
|
make -j4 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).
|