/*
 * write() should not return 0 after
 * the remote device has terminated the connetion.
 * This makes glib's io_channel terminate
 * the running program.
 *                kanchev@in.tum.de
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <poll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/rfcomm.h>


int main(int argc, char **argv)
{
	char dummy;
	int sock, r;
	struct sockaddr_rc saddr;
	struct pollfd pollfd;

	if (argc != 3) {
		fprintf(stderr, "Usage: %s <bluetooth address> <rfcomm channel>\n", argv[0]);
		return -1;
	}

	if ((sock = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM)) < 0) {
		perror("socket()");
		return -1;
	}

	memset(&saddr, 0, sizeof(struct sockaddr_rc));
	str2ba(argv[1], &saddr.rc_bdaddr);
	saddr.rc_family = AF_BLUETOOTH;
    saddr.rc_channel = (uint8_t) atoi(argv[2]);

	printf("Connecting to %s ...\n", argv[1]);
	if (connect(sock, (struct sockaddr *) &saddr, sizeof(struct sockaddr_rc)) < 0) {
		close(sock);
		perror("connect()");
		return -1;
	}

	pollfd.fd = sock;
	pollfd.events = POLLOUT;
	pollfd.revents = 0;
	if (poll(&pollfd, 1, -1) <= 0) {
		close(sock);
		perror("poll()");
		return -1;
	}

	printf("Turn off the bluetooth device %s now!\nPress enter to continue...", argv[1]);
	fflush(stdout);
	read(0, &dummy, 1);

	r = write(sock, "Hello", 5);
	printf("write() returned %d\n", r);

	close(sock);

	return 0;
}