Re: Inquiry result with RSSI (From Newbie)

My hcidump seems to be running now, but still cannot read the rssi value. Anyone please tell me where can I read the RSSI from the inquiry result.




----------------------------------------
> From: [email protected]
> To: [email protected]
> Subject: Inquiry result with RSSI (From Newbie)
> Date: Mon, 11 Aug 2008 16:24:17 -0500
> 
> 
> Dear all,
> 
>             Question from newbie. I am trying to send out the inquiry result format with RSSI.
> This is what I have done. 
> My steps are
> 1.)open the BT device (open socket)
> 2.)set up event filters
> 3.)set the inquiry mode to be result format with RSSI
> "int set_Inquiring = hci_send_cmd(sock, OGF_HOST_CTL, OCF_WRITE_INQUIRY_MODE, WRITE_INQUIRY_MODE_RP_SIZE, &cpp);//set inquiry mode"
> 4.)send out an inquiry
> "int Inquiring = hci_send_cmd(sock, OGF_LINK_CTL,OCF_INQUIRY , INQUIRY_CP_SIZE, &cp);//do inquiry"
> 5.)try to read the rssi from "inquiry_info_with_rssi read_rssi"
> 6.)close socket
> 
> Below is my code. Please advice me. Am I missing something here.
> /**************************************************************************************************
>  //Open BT device
> 	//to retrieve the BT id of the local BT adaptor
> 	local_BT_id = hci_get_route(NULL); //NULL option = get teh first available BT adaptor
> 	//check for error
> 	if (local_BT_id < 0)
> 	{
> 		//    	printf(stderr, "error code %d: %s\n",errno, strerror(errno));
> 		perror("Fail to get BT adaptor id");
> 		exit(1);
> 	}
> 	
> 	//to open the socket of the local BT device 
> 	sock = hci_open_dev( local_BT_id ); 
> 	// check for error
> 	if (local_BT_id < 0 || sock < 0) 
> 	{
> 		perror("Fail to open device socket");
> 		exit(1);
> 	}
> 	//*****************************************************    
> 	//Set up an event filter looking after the inquiry related events
> 	struct hci_filter InqFilter;
> 	hci_filter_clear(&InqFilter);
> 	hci_filter_set_ptype(HCI_EVENT_PKT,  &InqFilter);
> 	hci_filter_set_event(EVT_INQUIRY_RESULT, &InqFilter);
> 	hci_filter_set_event(EVT_INQUIRY_RESULT, &InqFilter);
> 	hci_filter_set_event(EVT_INQUIRY_RESULT_WITH_RSSI, &InqFilter);
> 	hci_filter_set_event(EVT_INQUIRY_RESULT_WITH_RSSI, &InqFilter);
> 	hci_filter_set_event(EVT_INQUIRY_COMPLETE, &InqFilter);
> 	if (setsockopt(sock, SOL_HCI, HCI_FILTER, &InqFilter, sizeof(InqFilter)) < 0)
> 	{
> 		perror("Fail to setup filter!");
> 		exit(1);
> 	}
> 
> 	//*****************************************************    
> 	//inquiry with the RSSI result
> 	inquiry_info_with_rssi read_rssi;
>         
> 	write_inquiry_mode_cp cpp;
> 	cpp.mode = 0x01;
> 	int set_Inquiring = hci_send_cmd(sock, OGF_HOST_CTL, OCF_WRITE_INQUIRY_MODE, WRITE_INQUIRY_MODE_RP_SIZE, &cpp);//set inquiry mode
> 	
> 	inquiry_cp cp;	
> 	cp.lap[0] =0x33;
> 	cp.lap[1] =0x8b;
> 	cp.lap[2] =0x9e;
> 	cp.length = 4; //=4*1.28second = 5seconds
> 	cp.num_rsp =0;
> 	
> 	int Inquiring = hci_send_cmd(sock, OGF_LINK_CTL,OCF_INQUIRY , INQUIRY_CP_SIZE, &cp);//do inquiry
> 	if (Inquiring < 0)
> 	{
> 
> 		printf("starting to inquire: %d\n",Inquiring);
> 		exit(1);
> 	}
> 	else 
> 		printf ("Done inquiry with RSSI!\n");
> 
>     printf("rssi value = %d \n", read_rssi.rssi); //Try to print the RSSI value here.
> 	close( sock );//close socket
> 	return 0;
> }
> /***********************************************************************
> 
> 
> Beside my hcidump shows no event result format with RSSI.
> 
> < HCI Command: Write Inquiry Mode (0x03|0x0045) plen 1
>   01 
>> HCI Event: Command Complete (0x0e) plen 4
>   01 45 0C 00 
> < HCI Command: Inquiry (0x01|0x0001) plen 5
>   33 8B 9E 04 00 
>> HCI Event: Command Status (0x0f) plen 4
>   12 01 01 04 
> /********************************************************************
> 
> Your kindness is greatly appreciated. I use Fedora9, with BlueZ version 3.32. (I tried command hciconfig hci0 inqmode 1 and it works fine, so I think the problem might not be from my usb dongle.)
> 
> Best regards,
> Sara
> 
> _________________________________________________________________
> 

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