Hello,

I'm new to using Bluez. I need to create a simple program to send text over a specific type of port (SOCK_DGRAM, BTPROTO_L2CAP). The code compiles fine, but when I run it i get the following error (from then sendto function).

Send Failed: Invalid argument

What might the problem be? My code is shown below. Thank-you so much for any help that you can offer.

,verber

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <bluetooth/bluetooth.h>

#include <bluetooth/l2cap.h>

#include <bluetooth/hci.h>

#include <bluetooth/hci_lib.h>

#include "l2cap_msg_send.h"

int fd;

int send_msg()

{

/* SETTING UP SOCKET */

struct sockaddr_l2 addr;

unsigned int psm = 0x1001;

fd = socket(AF_BLUETOOTH, SOCK_DGRAM, BTPROTO_L2CAP);

if (fd == -1) {

fprintf(stderr, "Could not open socket: %s\n", strerror(errno));

exit(1);

}

addr.l2_family = AF_BLUETOOTH;

bacpy(&addr.l2_bdaddr, BDADDR_ANY);

addr.l2_psm = htobs(psm);

if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) {

fprintf(stderr, "Could not bind socket: %s\n", strerror(errno));

exit(1);

}

/* END: SETTING UP SOCKET*/

/* SET UP MSG */

char recv_addr[18] = "00:0A:3A:53:1C:42";

struct sockaddr_l2 recipient;

recipient.l2_family = AF_BLUETOOTH;

str2ba(recv_addr,&(recipient.l2_bdaddr));

recipient.l2_psm = htobs(psm);

char message[] = "57 123 189";

/* END: SET UP MSG */

/* SEND MSG */

int ret;

socklen_t len;

len=sizeof(recipient.l2_bdaddr);

size_t msg_len;

msg_len=sizeof(message);

ret = sendto(fd, &message, msg_len,0, (struct sockaddr *) &recipient, len);

printf("%d\n",ret);

if( ret < 0 ) fprintf(stderr,"Send Failed: %s\n",strerror(errno));

/* END: SEND MSG */

// close(fd);

return 0;

}