[Bluez-devel] Need Help In SDP Programming......

["Rupesh Gujare" <rupesh_gujare@rediffmail.com>]

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Hello all,
    I am a newbie to bluez programming. and i am currently writing a code that will discover all nearby bluetooth devices and make a SDP enquiry to know on which channel "OBEX Object Push" service is running.
   For this purpose i have gone through a quiet a few documentation and sample code. And i am ready with some code.
    
   Now my question is why it is required to give a "sleep(1)" call before sdp_connect() call? If i dont give it, sdp connection simply fails. And how should i reduce over all time of making discovery of devices and connecting to their respective SDP servers.
  I am using USB dongle as a local bluetooth device.

  Can someone help me on this issues? And how can i write better and efficient code?
Any reviews and suggestions for improvement r welcomed.
 Any help will be greatly appreciated.
Thanks in advance 
Rupesh..

My code :----

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/sdp.h>
#include <bluetooth/sdp_lib.h>

int port_search(bdaddr_t *target);

int main(int argc, char **argv)
{
    inquiry_info *ii = NULL;
    int max_rsp, num_rsp;
    int dev_id, sock, len, flags;
    int i;
    char addr[19] = { 0 };
    char name[248] = { 0 };
    dev_id = hci_get_route(NULL);
    sock = hci_open_dev( dev_id );
                                   
  if (dev_id < 0 || sock < 0) {
      perror("opening socket");
      exit(1);
  }
  len = 8;
  max_rsp = 255;
  flags = IREQ_CACHE_FLUSH;
  ii = (inquiry_info*)malloc(max_rsp * sizeof(inquiry_info));
  num_rsp = hci_inquiry(dev_id, len, max_rsp, NULL, &ii, flags);
  printf("%d Blue devices found\n",num_rsp);
  if( num_rsp < 0 ) perror("hci_inquiry");
  for (i = 0; i < num_rsp; i++) {
      ba2str(&(ii+i)->bdaddr, addr);
      memset(name, 0, sizeof(name));
      if (hci_read_remote_name(sock, &(ii+i)->bdaddr, sizeof(name),
          name, 0) < 0)
      strcpy(name, "[unknown]");
      printf("%s %s\n", addr, name);
	  port_search(&(ii+i)->bdaddr);
  }
  free( ii );
  close( sock );
  return 0;
}




int port_search(bdaddr_t *target)
{
    uint16_t svc_uuid_int = 0x1105;
    int status;
    char addr[18];
    bdaddr_t local_addr;
    uuid_t svc_uuid;
    sdp_list_t *response_list, *search_list, *attrid_list;
    sdp_session_t *session = 0;
    uint32_t range = 0x0000ffff;
    uint8_t port = 0;

    ba2str(target,addr);
	printf("Target blue addr is %s\n",addr);
	//str2ba( addr, &target );
    // connect to the SDP server running on the remote machine
      
      ba2str(&local_addr, addr);
      printf("Local address is %s\n",addr);  
	  sleep(1);
      session = sdp_connect( BDADDR_ANY, target,SDP_RETRY_IF_BUSY);
	if (session==NULL)
	{
		printf("Can not connect to SDP server\n");
		return -1;
	}
    sdp_uuid16_create( &svc_uuid, svc_uuid_int );
    search_list = sdp_list_append( 0, &svc_uuid );
    attrid_list = sdp_list_append( 0, &range );
    // get a list of service records that have UUID 0xabcd
    response_list = NULL;

  status = sdp_service_search_attr_req( session, search_list, SDP_ATTR_REQ_RANGE, attrid_list, &response_list);
  if( status == 0 ) {
		  if(response_list==NULL)
		  {	      
		  	printf("Object Push Service not found\n");
		  	return -1;
		  }
	  sdp_list_t *proto_list;
      sdp_list_t *r = response_list;
      // go through each of the service records
      for (; r; r = r->next ) {
          sdp_record_t *rec = (sdp_record_t*) r->data;
          // get a list of the protocol sequences
          if( sdp_get_access_protos( rec, &proto_list ) == 0 ) 
		 //    if(sdp_get_profile_descs(rec,&proto_list)==0)
		  {
		 
              // get the RFCOMM port number
              port = sdp_get_proto_port( proto_list, RFCOMM_UUID );
              sdp_list_free( proto_list, 0 );
          }
          sdp_record_free( rec );
      }
  }
  sdp_list_free( response_list, 0 );
  sdp_list_free( search_list, 0 );
  sdp_list_free( attrid_list, 0 );
  sdp_close( session );
  if( port != 0 ) {
      printf("found service running on RFCOMM port %d\n", port);
  }
  return 0;
}

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