kopia lustrzana https://github.com/PiInTheSky/lora-gateway
68 wiersze
1.5 KiB
C
68 wiersze
1.5 KiB
C
#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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// #include <sys/time.h>
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//for Mac OS X
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// #include <stdlib.h>
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void UDPSend(char *message, int port)
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{
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if (port > 0)
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{
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int sd, rc;
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struct sockaddr_in cliAddr, remoteServAddr;
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struct hostent *h;
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int broadcast = 1;
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h = gethostbyname("255.255.255.255");
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remoteServAddr.sin_family = h->h_addrtype;
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memcpy((char *) &remoteServAddr.sin_addr.s_addr, h->h_addr_list[0], h->h_length);
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remoteServAddr.sin_port = htons(port);
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// socket creation
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sd = socket(AF_INET,SOCK_DGRAM,0);
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if (sd<0)
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{
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// printf("Cannot open socket on port %d\n", port);
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return;
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}
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if (setsockopt(sd, SOL_SOCKET, SO_BROADCAST, &broadcast,sizeof broadcast) == -1)
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{
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// printf("setsockopt (SO_BROADCAST)");
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return;
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}
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// bind any port
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cliAddr.sin_family = AF_INET;
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cliAddr.sin_addr.s_addr = htonl(INADDR_ANY);
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cliAddr.sin_port = htons(0);
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rc = bind(sd, (struct sockaddr *) &cliAddr, sizeof(cliAddr));
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if (rc<0)
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{
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// printf("%s: cannot bind port\n", argv[0]);
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return;
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}
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// send data
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rc = sendto(sd, message, strlen(message), 0, (struct sockaddr *) &remoteServAddr, sizeof(remoteServAddr));
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if (rc<0)
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{
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// printf("%s: cannot send data %d \n",argv[0],i-1);
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close(sd);
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return;
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}
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close(sd);
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}
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}
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