[Bluez-users] Odd inquiry scan result

[Olivier Randriamanana <olivier_randria@yahoo.com>]

Hi,

I'm trying to understand how to send HCI commands (my
final goal is to put my device in periodic
inquiry...). For the moment, using hcitool.c as an
example, I issue a HCI_Read_Inquiry_Scan_Activity
command to the device.

I zero the read_inq_activity_rp structure, and send
the command. No error it seems, as the Command
Complete event is received, and here is the hex dump
of received data:
> HCI Event: 0x0e plen 8
  01 1D 0C 12 00 00 00 00

However my read_inq_activity_rp structure is not
changed. I would have expected it to have the default
values (as read from the spec). 
I can't figure out what I'm getting wrong, could
someone please provide a hint???

Regards, 
Olivier


Code:
#include <stdio.h>
#include <stdlib.h>

#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>

void hex_dump(char *pref, int width, unsigned char
*buf, int len);
void send_cmd(int dev_id, uint16_t ocf,uint8_t ogf /*,
int argc, char **argv*/);

int main(int argc, char* argv[])
{
  printf("%s:\n",argv[0]);

  send_cmd(0,OCF_PERIODIC_INQUIRY,OGF_HOST_CTL);

  return 0;
}

void send_cmd(int dev_id, uint16_t uocf,uint8_t uogf
/*, int argc, char **argv*/)
{
  char buf[HCI_MAX_EVENT_SIZE], *ptr = buf;
  struct hci_filter flt;
  hci_event_hdr *hdr;
  int i, opt, len, dd;
  read_inq_activity_rp rp;
  read_inq_activity_rp* prp;
  
  uint16_t ocf = OCF_READ_INQ_ACTIVITY;
  uint8_t ogf  = OGF_HOST_CTL;
  
  
  printf("%s: OGF %d OCF %d dev_id
%d\n",__FUNCTION__,ogf,ocf,dev_id);
  dd = hci_open_dev(dev_id);
  if (dd < 0) {
    perror("Device open failed");
    exit(EXIT_FAILURE);
  }
  
  
  /* Setup filter */
  hci_filter_clear(&flt);
  
  hci_filter_set_ptype(HCI_EVENT_PKT, &flt);
  hci_filter_all_events(&flt);
  
  if (setsockopt(dd, SOL_HCI, HCI_FILTER, &flt,
sizeof(flt)) < 0) {
    perror("HCI filter setup failed");
    exit(EXIT_FAILURE);
  }
  prp = &rp;
  prp->status = 0;
  prp->interval = 0;
  prp->window = 0;
  
  len = READ_INQ_ACTIVITY_RP_SIZE;
  ptr = &rp;
  printf("< HCI Command: ogf 0x%02x, ocf 0x%04x, plen
%d (sizeof %d)\n", ogf, ocf, len,sizeof(rp));
  
  if (hci_send_cmd(dd, ogf, ocf, len, ptr /*buf*/) <
0) {
    perror("Send failed");
    exit(EXIT_FAILURE);
  }
  printf("rp.status %d, interval %d, window %d\n",
	       prp->status,
	 prp->interval,
	 prp->window);
  
  len = read(dd, buf, sizeof(buf));
  if (len < 0) {
    perror("Read failed");
		exit(EXIT_FAILURE);
  }
  
  hdr = (void *)(buf + 1);
  ptr = buf + (1 + HCI_EVENT_HDR_SIZE);
  len -= (1 + HCI_EVENT_HDR_SIZE);
  
  printf("> HCI Event: 0x%02x plen %d\n", hdr->evt,
hdr->plen);
  
  hex_dump("  ", 20, ptr, len); fflush(stdout);
  printf("rp.status %d, interval %d, window %d\n",
	 prp->status,
	 prp->interval,
	 prp->window);
  prp = ptr;
  printf("rp.status %d, interval %d, window %d\n",
	 prp->status,
	 prp->interval,
	 prp->window);
  hci_close_dev(dd);
}

void hex_dump(char *pref, int width, unsigned char
*buf, int len)
{
	register int i,n;

	for (i = 0, n = 1; i < len; i++, n++) {
		if (n == 1)
			printf("%s", pref);
		printf("%2.2X ", buf[i]);
		if (n == width) {
			printf("\n");
			n = 0;
		}
	}
	if (i && n!=1)
		printf("\n");
}


--
Olivier


		
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