[Bluez-users] sendto give invalid argument

[Bluez-users] sendto give invalid argument

[Verber Seti]

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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;}
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Re: [Bluez-users] sendto give invalid argument

[P. Durante]

I didn't look very carefully at your code, but the first thing I
noticed is how you create the socket, I wrote a C++ wrapper over bluez
a while ago and it has a class for L2Cap connections, the constructor
goes this way:

L2CapSocket::L2CapSocket()
:=09Socket( PF_BLUETOOTH, SOCK_SEQPACKET, BTPROTO_L2CAP )
{}

and it worked great for me, so maybe you should pass different
parameters to the socket(...); call.

regards,
Paul


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