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@2:ae37f80efd23, 2010-11-24 (annotated)

Committer:
Schueler
Date:
Wed Nov 24 23:46:38 2010 +0000
Revision:
2:ae37f80efd23
Parent:
1:2e2d0b0b57e0
Child:
3:3c33a398189e
0.03

Debug info improved.

Send message to client ID

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Schueler 0:c111a981bfb8 1 #include "mbed.h"
Schueler 0:c111a981bfb8 2 #include "EthernetNetIf.h"
Schueler 0:c111a981bfb8 3 #include "UDPSocket.h"
Schueler 0:c111a981bfb8 4
Schueler 0:c111a981bfb8 5 Serial pc(USBTX, USBRX);
Schueler 0:c111a981bfb8 6 EthernetNetIf eth;
Schueler 0:c111a981bfb8 7 UDPSocket udp;
Schueler 0:c111a981bfb8 8 DigitalOut led(LED1);
Schueler 0:c111a981bfb8 9 InterruptIn button(p5);
Schueler 1:2e2d0b0b57e0 10 Ticker AliveTicker;
Schueler 0:c111a981bfb8 11
Schueler 1:2e2d0b0b57e0 12 // xxx will be replaced by LSByte of the IP address
Schueler 1:2e2d0b0b57e0 13 //
Schueler 0:c111a981bfb8 14 // Message to let the other know we are alive
Schueler 1:2e2d0b0b57e0 15 char strAlive[15];
Schueler 2:ae37f80efd23 16
Schueler 1:2e2d0b0b57e0 17 char mebed_list[16];
Schueler 1:2e2d0b0b57e0 18
Schueler 1:2e2d0b0b57e0 19 char ButtonPressed = 0;
Schueler 1:2e2d0b0b57e0 20 char SendAlive = 0;
Schueler 1:2e2d0b0b57e0 21 char mbed_id = 0;
Schueler 2:ae37f80efd23 22 char mbed_client = 0;
Schueler 0:c111a981bfb8 23
Schueler 1:2e2d0b0b57e0 24 void Alive() // ticker routine
Schueler 1:2e2d0b0b57e0 25 {
Schueler 1:2e2d0b0b57e0 26 SendAlive = 1;
Schueler 1:2e2d0b0b57e0 27 }
Schueler 1:2e2d0b0b57e0 28
Schueler 1:2e2d0b0b57e0 29 void button_pressed() // irq routine for button
Schueler 1:2e2d0b0b57e0 30 {
Schueler 1:2e2d0b0b57e0 31 ButtonPressed = 1;
Schueler 0:c111a981bfb8 32 }
Schueler 0:c111a981bfb8 33
Schueler 0:c111a981bfb8 34
Schueler 0:c111a981bfb8 35 void onUDPSocketEvent(UDPSocketEvent e)
Schueler 0:c111a981bfb8 36 {
Schueler 0:c111a981bfb8 37 switch(e)
Schueler 0:c111a981bfb8 38 {
Schueler 0:c111a981bfb8 39 case UDPSOCKET_READABLE: //The only event for now
Schueler 0:c111a981bfb8 40 char buf[64] = {0};
Schueler 0:c111a981bfb8 41 Host host;
Schueler 0:c111a981bfb8 42 while( int len = udp.recvfrom( buf, 63, &host ) )
Schueler 0:c111a981bfb8 43 {
Schueler 0:c111a981bfb8 44 if( len <= 0 )
Schueler 0:c111a981bfb8 45 break;
Schueler 0:c111a981bfb8 46
Schueler 0:c111a981bfb8 47 // should implement a parser...
Schueler 0:c111a981bfb8 48 // but this will do the trick for the moment
Schueler 0:c111a981bfb8 49 if ( strncmp ( buf, "MBED", 4 ) == 0 )
Schueler 0:c111a981bfb8 50 {
Schueler 1:2e2d0b0b57e0 51 //pc.printf ("message from %d.%d.%d.%d: %s\n", host.getIp()[0], host.getIp()[1], host.getIp()[2], host.getIp()[3], buf );
Schueler 0:c111a981bfb8 52
Schueler 2:ae37f80efd23 53 mbed_client = 0;
Schueler 1:2e2d0b0b57e0 54 for ( int i = 5; i < 8; i++ )
Schueler 0:c111a981bfb8 55 {
Schueler 1:2e2d0b0b57e0 56 if ( ( buf[i] >= '0' ) & ( buf[i] <= '9' ) ) { mbed_client *=10; mbed_client += ( buf[i] - '0' ); }
Schueler 0:c111a981bfb8 57 }
Schueler 0:c111a981bfb8 58 if ( strstr (buf, "ALIVE") != NULL )
Schueler 0:c111a981bfb8 59 {
Schueler 2:ae37f80efd23 60 pc.printf ("MBED %d is alive\n\r", mbed_client );
Schueler 0:c111a981bfb8 61 }
Schueler 0:c111a981bfb8 62 if ( strstr (buf, "LED") != NULL )
Schueler 0:c111a981bfb8 63 {
Schueler 2:ae37f80efd23 64 pc.printf ("Message for MBED %d\n\r", mbed_client );
Schueler 0:c111a981bfb8 65 if ( strstr (buf, "ON") != NULL ) { led = 1; }
Schueler 0:c111a981bfb8 66 if ( strstr (buf, "OFF") != NULL ) { led = 0; }
Schueler 0:c111a981bfb8 67 }
Schueler 0:c111a981bfb8 68 }
Schueler 0:c111a981bfb8 69 }
Schueler 0:c111a981bfb8 70 break;
Schueler 0:c111a981bfb8 71 }
Schueler 0:c111a981bfb8 72 }
Schueler 0:c111a981bfb8 73
Schueler 0:c111a981bfb8 74 int main() {
Schueler 0:c111a981bfb8 75 char pos = 0;
Schueler 0:c111a981bfb8 76 pc.baud(115200);
Schueler 0:c111a981bfb8 77 pc.printf("Ethernet...\n");
Schueler 0:c111a981bfb8 78 EthernetErr ethErr = eth.setup();
Schueler 0:c111a981bfb8 79 if(ethErr)
Schueler 0:c111a981bfb8 80 {
Schueler 1:2e2d0b0b57e0 81 pc.printf("Error %d in setup.\n", ethErr);
Schueler 0:c111a981bfb8 82 return -1;
Schueler 0:c111a981bfb8 83 }
Schueler 1:2e2d0b0b57e0 84 pc.printf(" OK\n\r");
Schueler 0:c111a981bfb8 85
Schueler 1:2e2d0b0b57e0 86 IpAddr ethIp = eth.getIp();
Schueler 2:ae37f80efd23 87 mbed_id = ethIp[3];
Schueler 2:ae37f80efd23 88 sprintf( strAlive, "MBED %d ALIVE\0", mbed_id );
Schueler 2:ae37f80efd23 89
Schueler 1:2e2d0b0b57e0 90 pc.printf( "%s\n\r", strAlive );
Schueler 1:2e2d0b0b57e0 91 // set Alive Broadcast to 10 seconds
Schueler 1:2e2d0b0b57e0 92 AliveTicker.attach(&Alive, 10);
Schueler 0:c111a981bfb8 93 Host multicast(IpAddr(239, 192, 1, 100), 50000, NULL); //Join multicast group on port 50000
Schueler 0:c111a981bfb8 94
Schueler 0:c111a981bfb8 95 udp.setOnEvent(&onUDPSocketEvent);
Schueler 0:c111a981bfb8 96
Schueler 0:c111a981bfb8 97 udp.bind(multicast);
Schueler 0:c111a981bfb8 98
Schueler 1:2e2d0b0b57e0 99 udp.sendto( strAlive, strlen(strAlive), &multicast );
Schueler 0:c111a981bfb8 100
Schueler 0:c111a981bfb8 101 button.rise(&button_pressed);
Schueler 0:c111a981bfb8 102 while(true)
Schueler 0:c111a981bfb8 103 {
Schueler 0:c111a981bfb8 104 Net::poll();
Schueler 1:2e2d0b0b57e0 105 if ( SendAlive == 1 ) { udp.sendto( strAlive, strlen(strAlive), &multicast ); SendAlive = 0; } // Send Alive Signal
Schueler 1:2e2d0b0b57e0 106
Schueler 1:2e2d0b0b57e0 107 if( ButtonPressed != 0 )
Schueler 0:c111a981bfb8 108 {
Schueler 0:c111a981bfb8 109 char strout[20];
Schueler 0:c111a981bfb8 110 pos = !pos;
Schueler 2:ae37f80efd23 111 if ( pos == 0 ) sprintf( strout, "MBED %d LED OFF\0", mbed_client ); else sprintf( strout, "MBED %d LED ON\0", mbed_client );
Schueler 0:c111a981bfb8 112 udp.sendto( strout, strlen(strout), &multicast );
Schueler 1:2e2d0b0b57e0 113 //pc.printf("%s\n", str);
Schueler 1:2e2d0b0b57e0 114 ButtonPressed = 0;
Schueler 0:c111a981bfb8 115 }
Schueler 0:c111a981bfb8 116 }
Schueler 0:c111a981bfb8 117
Schueler 0:c111a981bfb8 118
Schueler 0:c111a981bfb8 119 }