Skip to content

Added a basic WiFi UDP client example #114

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 2 commits into from
Feb 3, 2017
Merged

Added a basic WiFi UDP client example #114

Changes from 1 commit
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
2320268
Added a basic WiFi UDP client example: a sketch that sends random byt…
JorenSix Jan 3, 2017
7f68d5b
Updated udp example and included Python and Ruby UDP servers.
JorenSix Feb 3, 2017
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
77 changes: 77 additions & 0 deletions libraries/WiFi/examples/WiFiUDPClient/WiFiUDPClient.ino
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,77 @@
/*
* This sketch sends random data over UDP on a ESP32 device
*
*/
#include <WiFi.h>
#include <WiFiUdp.h>

// WiFi network name and password:
const char * networkName = "network_name";
const char * networkPswd = "password";

//IP address to send UDP data to:
const char * udpAddress = "192.168.1.255";
const int udpPort = 3333;

//Are we currently connected?
boolean connected = false;

//The udp library class
WiFiUDP udp;

void setup(){
// Initilize hardware serial:
Serial.begin(115200);

//Connect to the WiFi network
connectToWiFi(networkName, networkPswd);
}

void loop(){
//only send data when connected
if(connected){

//send one random byte
byte randomData = (byte) random(255);

//Send a packet
udp.beginPacket(udpAddress,udpPort);
udp.write(randomData);
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

I changed this to:

if(connected){
    //Send a packet
    udp.beginPacket(udpAddress,udpPort);
    udp.printf("seconds since boot: %u", millis()/1000);
    udp.endPacket();
}

and then used this simple python server to listen:

import socket
import sys

try :
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
except socket.error, msg :
    print 'Failed to create socket. Error Code : ' + str(msg[0]) + ' Message ' + msg[1]
    sys.exit()

try:
    s.bind(('', 3333))
except socket.error , msg:
    print 'Bind failed. Error: ' + str(msg[0]) + ': ' + msg[1]
    sys.exit()
     
print 'Server listening'

while 1:
    d = s.recvfrom(1024)
    data = d[0]
     
    if not data: 
        break
    
    print data.strip()
    
s.close()

You might want to add those to further enhance your example :)

udp.endPacket();
}
//Wait for 1.5 seconds
delay(1500);
}

void connectToWiFi(const char * ssid, const char * pwd){
Serial.println("Connecting to WiFi network: " + String(ssid));

// delete old config
WiFi.disconnect(true);
//register event handler
WiFi.onEvent(WiFiEvent);

//Initiate connection
WiFi.begin(ssid, pwd);

Serial.println("Waiting for WIFI connection...");
}

//wifi event handler
void WiFiEvent(WiFiEvent_t event){
switch(event) {
case SYSTEM_EVENT_STA_GOT_IP:
//When connected set
Serial.print("WiFi connected! IP address: ");
Serial.println(WiFi.localIP());
//initializes the UDP state
//This initializes the transfer buffer
port.begin(WiFi.localIP(),udpPort);
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

this should be udp.begin(WiFi.localIP(),udpPort);

connected = true;
break;
case SYSTEM_EVENT_STA_DISCONNECTED:
Serial.println("WiFi lost connection");
connected = false;
break;
}
}