Added a basic WiFi UDP client example

[JorenSix]

Added a basic WiFi UDP client example: a sketch that sends random bytes over UDP. It uses the recently implemented UDP functionality.

[me-no-dev]

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

[me-no-dev]

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 :)

[me-no-dev]

@JorenSix hey :) you mind fixing this commit so I can merge it?

[JorenSix]

Ok :) check the changes