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

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

[Rupesh Gujare]

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

[Mingfan.Lu]

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Hi,
  What is your kernel version and Have you patch the latest bluez-patch ?.
  I think it is the problem of currency connections. There are many
discussions about it in the maillist. From patch-linux-2.6.18-mh4
  The problem seems to be solved.


2 Nov 2006 04:39:06 -0000, Rupesh Gujare <rupesh_gujare@rediffmail.com>:
>
> 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;
> }
>
>
>
> <http://adworks.rediff.com/cgi-bin/AdWorks/sigclick.cgi/www.rediff.com/signature-home.htm/1507191490@Middle5?PARTNER=3>
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>
>
>


-- 
With respects,
   Mingfan.Lu

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

[Peter Wippich]

Hello Rupesh, 

On Thu, 2 Nov 2006, Rupesh Gujare wrote:

> 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..

I think the sleep(..) call causes a reschedule and allows the sdpd to 
finish some internal cleanup or so after a close. I got some similar 
behaviour even when connecting to the local sdp data base. 

To get your code a little bit faster you should not use the hci_inquiry() 
call. This does not only do the inquiry but also does a name request which 
requires a baseband connection to the remote device. It is much more 
efficient to do the name request as a part of the sdp request if you make 
the sdp request anyway (only one baseband connection for each device). 

Further, because most BT chips today allow for inquirie to run in the 
background, you can try to start SDP requests once you receive the BT 
address for a device and not when the inquiry is finished. However, this 
would require some much more complicated code and direct HCI socket 
programming. You may have a look at hcid to get an idea. 

Ciao, 

Peter 

> 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;
> }
> 


|       Peter Wippich                   Voice: +49 30 46776411          |
|       G&W Instruments GmbH            fax:   +49 30 46776419          |
|       Gustav-Meyer-Allee 25, Geb. 12  Email: pewi@gw-instruments.de   |
|       D-13355 Berlin  / Germany                                       |


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

[Rupesh Gujare]

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Thanks Peter and Mingfan for your suggestions and code review. I will definately try to improve on it. 
  I am currently working on 2.6.15 kernel. and had not applied any patch.
 I will like to ask peter that which kernel you are using? Are you facing same problem after patching to latest kernel?
  Do let me know.
  Thanks and regards.
 Rupesh

>
>I think the sleep(..) call causes a reschedule and allows the sdpd to
>finish some internal cleanup or so after a close. I got some similar
>behaviour even when connecting to the local sdp data base.
>
>To get your code a little bit faster you should not use the hci_inquiry()
>call. This does not only do the inquiry but also does a name request which
>requires a baseband connection to the remote device. It is much more
>efficient to do the name request as a part of the sdp request if you make
>the sdp request anyway (only one baseband connection for each device).
>
>Further, because most BT chips today allow for inquirie to run in the
>background, you can try to start SDP requests once you receive the BT
>address for a device and not when the inquiry is finished. However, this
>would require some much more complicated code and direct HCI socket
>programming. You may have a look at hcid to get an idea.
>
>Ciao,
>
>Peter

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

[Peter Wippich]

Hello Rupesh, 

On Thu, 2 Nov 2006, Rupesh Gujare wrote:

>   
> Thanks Peter and Mingfan for your suggestions and code review. I will 
> definately try to improve on it. 
>   I am currently working on 2.6.15 kernel. and had not applied any patch.
>  I will like to ask peter that which kernel you are using? Are you facing same problem after patching to latest kernel?
>   Do let me know.
>   Thanks and regards.
>  Rupesh

The concurrency problem Mingfan talked about is not what causes your 
problem. This would only show up when you use multiple threads to do 
concurrent SDP connections, and you use a single thread. 

I observed something similar as you with an unpatched 2.6.14 kernel. 
Because this was on an embedded platform I have not tried newer versions 
(this simply causes to much work just for a try). 

Ciao, 

Peter 


|       Peter Wippich                   Voice: +49 30 46776411          |
|       G&W Instruments GmbH            fax:   +49 30 46776419          |
|       Gustav-Meyer-Allee 25, Geb. 12  Email: pewi@gw-instruments.de   |
|       D-13355 Berlin  / Germany                                       |


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

[Rupesh Gujare]

[-- Attachment #1.1: Type: text/plain, Size: 1559 bytes --]

  
Thanks Peter, 
  Currently i am testing this code on desktop. without any multiple threads. But in future i need to port it on embedded device with multiple threads. 
 Please do let me know if i can do it with latest kernel.
 So any of your experience will be of great help for me.
 Thanks and regards.
 Rupesh

On Thu, 02 Nov 2006 Peter Wippich wrote :
>
>Hello Rupesh,
>
>On Thu, 2 Nov 2006, Rupesh Gujare wrote:
>
> >
> > Thanks Peter and Mingfan for your suggestions and code review. I will
> > definately try to improve on it.
> >   I am currently working on 2.6.15 kernel. and had not applied any patch.
> >  I will like to ask peter that which kernel you are using? Are you facing same problem after patching to latest kernel?
> >   Do let me know.
> >   Thanks and regards.
> >  Rupesh
>
>The concurrency problem Mingfan talked about is not what causes your
>problem. This would only show up when you use multiple threads to do
>concurrent SDP connections, and you use a single thread.
>
>I observed something similar as you with an unpatched 2.6.14 kernel.
>Because this was on an embedded platform I have not tried newer versions
>(this simply causes to much work just for a try).
>
>Ciao,
>
>Peter
>
>
>|       Peter Wippich                   Voice: +49 30 46776411          |
>|       G&W Instruments GmbH            fax:   +49 30 46776419          |
>|       Gustav-Meyer-Allee 25, Geb. 12  Email: pewi@gw-instruments.de   |
>|       D-13355 Berlin  / Germany                                       |
>

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