diff resources/network/udp-client-sweep.c @ 28:adcb57fd3d75 bbb_network

- added a c script to have the oscillator perform a sine sweep
- added documentation for the network

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/resources/network/udp-client-sweep.c	Sun May 10 13:55:43 2015 +0100
@@ -0,0 +1,59 @@
+/* UDP client in the internet domain */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+
+void error(const char *);
+int main(int argc, char *argv[])
+{
+   int sock, n;
+   unsigned int length;
+   struct sockaddr_in server, from;
+   struct hostent *hp;
+   char buffer[256];
+   
+   if (argc != 3) { printf("Usage: server port\n");
+                    exit(1);
+   }
+
+   server.sin_family = AF_INET;
+   hp = gethostbyname(argv[1]);
+   if (hp==0) error("Unknown host");
+
+   bcopy((char *)hp->h_addr, 
+        (char *)&server.sin_addr,
+         hp->h_length);
+   server.sin_port = htons(atoi(argv[2]));
+   length=sizeof(struct sockaddr_in);
+   while (1){
+     sock= socket(AF_INET, SOCK_DGRAM, 0);
+     if (sock < 0) error("socket");
+     bzero(buffer,256);
+//     printf("Please enter the message: ");
+//     fgets(buffer,255,stdin);
+     double freq=50;
+     while(1){
+       freq*=1.001;
+       if(freq>20000) freq=50;
+       sprintf(buffer,"%.4f;",freq);
+       n=sendto(sock,buffer,
+            strlen(buffer),0,(const struct sockaddr *)&server,length);
+       if (n < 0) error("Sendto");
+       usleep(1000);
+     }
+   }
+   close(sock);
+   return 0;
+}
+
+void error(const char *msg)
+{
+    perror(msg);
+    exit(0);
+}