Ben Schueler / Mbed 2 deprecated UDPSocket_Node

this program can by compiled and run on several mbeds in a network. The mbed ID is automatically generated. This program is a small test to see if it works. To test the firmware you will need two ( or more ) mbed modules connected to the same network. Pin p5 should be connected with a push button to 3v3 and a resistor of 10k to ground. If the button is pressed the mbed will broadcast a message on ip 239, 192, 1, 100 on port 50000. All mbeds are listening to this ip address and port so they will pick up this message. If the message says MBED xyz LED ON, led1 will id on. If the message says MBED LED OFF, led1 will be off. It\\\'s that simple. So with one mbed you can turn the other mbeds led on or off.

Dependencies:   EthernetNetIf NTPClient_NetServices mbed

UDPSocketExample.cpp

Committer:
Schueler
Date:
2011-02-14
Revision:
3:3c33a398189e
Parent:
2:ae37f80efd23

File content as of revision 3:3c33a398189e:

#include "system.h"


void Alive()         // ticker routine
{
    SendAlive = 1;
}

void button_pressed()   // irq routine for button
{
    ButtonPressed = 1;
}


void onUDPSocketEvent(UDPSocketEvent e)
{
  switch(e)
  {
  case UDPSOCKET_READABLE: //The only event for now
    char buf[64] = {0};
    Host host;
    while( int len = udp.recvfrom( buf, 63, &host ) )
    {
      if( len <= 0 )
        break;
        
        // should implement a parser...
        // but this will do the trick for the moment
        if ( strncmp ( buf, "MBED", 4 ) == 0 )
        {
            //pc.printf ("message from %d.%d.%d.%d: %s\n", host.getIp()[0], host.getIp()[1], host.getIp()[2], host.getIp()[3], buf );

            mbed_client = 0;
            for ( int i = 5; i < 8; i++ )
            {
                if ( ( buf[i] >= '0' ) & ( buf[i] <= '9' ) ) { mbed_client *=10; mbed_client += ( buf[i] - '0' ); }
            }
            if ( strstr (buf, "ALIVE") != NULL )
            {
                pc.printf ("MBED %d is alive\n\r", mbed_client );
            }
            if ( strstr (buf, "LED") != NULL )
            {
                pc.printf ("Message for MBED %d\n\r", mbed_client );
                if ( strstr (buf, "ON")  != NULL ) { led = 1; }
                if ( strstr (buf, "OFF") != NULL ) { led = 0; }
            }
        }
    }
    break;
  }
}

int main() {
  char pos = 0;
  pc.baud(115200);
  pc.printf("Ethernet...\n\r");
  EthernetErr ethErr = eth.setup();
  if(ethErr)
  {
    pc.printf("Error %d in setup.\n\r", ethErr);
    return -1;
  }
  pc.printf("  OK\n\r");
  IpAddr ethIp = eth.getIp();
  mbed_id = ethIp[3];
  sprintf( strAlive, "MBED %d ALIVE\0", mbed_id );

  pc.printf( "%s\n\r", strAlive );

    /* Set up NTP */
//    lcd.printf("Setting up NTP\n");
    Host server(IpAddr(), 123, "0.uk.pool.ntp.org");
    ntp.setTime(server);
    /* Temporary variables for control loop */
    time_t rtc_time = time(NULL);
    int minute = -1;


  // set Alive Broadcast to 10 seconds
  AliveTicker.attach(&Alive, 10);  
  Host multicast(IpAddr(239, 192, 1, 100), 50000, NULL); //Join multicast group on port 50000
 
  udp.setOnEvent(&onUDPSocketEvent);
  
  udp.bind(multicast);

  udp.sendto( strAlive, strlen(strAlive), &multicast );
  
  button.rise(&button_pressed);
  while( 1 ) // Never Ending Story by Michael Ende
  {
    Net::poll();
    if ( SendAlive == 1 ) { udp.sendto( strAlive, strlen(strAlive), &multicast ); SendAlive = 0; }    // Send Alive Signal
    
    if( ButtonPressed != 0 )
    {
      char strout[20];
      pos = !pos;
      if ( pos == 0 ) sprintf( strout, "MBED %d LED OFF\0", mbed_client ); else sprintf( strout, "MBED %d LED ON\0", mbed_client );
      udp.sendto( strout, strlen(strout), &multicast );
      //pc.printf("%s\n", str);
      ButtonPressed = 0;
    }

        /* Update current time */
        rtc_time = time(NULL);
        cTime = localtime(&rtc_time);
        if (cTime->tm_min != minute)
        {
            pc.printf("*** %d:%d ***\n\r", cTime->tm_hour, cTime->tm_min);
            minute = cTime->tm_min;
            /* Update time from NTP server if it's midnight UTC */
            if ((cTime->tm_min == 0) && (cTime->tm_hour == 0))
            {
                Host server(IpAddr(), 123, "0.uk.pool.ntp.org");
                ntp.setTime(server);
            }
        }

  }

  
}