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BT_DEV(3)		 BSD Library Functions Manual		     BT_DEV(3)

NAME
     bt_devaddr, bt_devname, bt_devenum, bt_devinfo, bt_devopen, bt_devsend,
     bt_devrecv, bt_devreq, bt_devfilter, bt_devfilter_pkt_set,
     bt_devfilter_pkt_clr, bt_devfilter_pkt_tst, bt_devfilter_evt_set,
     bt_devfilter_evt_clr, bt_devfilter_evt_tst, bt_devinquiry — Bluetooth
     device access routines

LIBRARY
     library “libbluetooth”

SYNOPSIS
     #include <bluetooth.h>

     int
     bt_devaddr(const char *name, bdaddr_t *bdaddr);

     int
     bt_devname(char *name, const bdaddr_t *bdaddr);

     int
     bt_devenum(int (*cb)(int, const struct bt_devinfo *, void *), void *arg);

     int
     bt_devinfo(const char *name, struct bt_devinfo *info);

     int
     bt_devopen(const char *name, int flags);

     ssize_t
     bt_devsend(int s, uint16_t opcode, void *param, size_t plen);

     ssize_t
     bt_devrecv(int s, void *buf, size_t size, time_t timeout);

     int
     bt_devreq(int s, struct bt_devreq *req, time_t timeout);

     int
     bt_devfilter(int s, const struct bt_devfilter *new,
	 struct bt_devfilter *old);

     void
     bt_devfilter_pkt_set(struct bt_devfilter *filter, uint8_t type);

     void
     bt_devfilter_pkt_clr(struct bt_devfilter *filter, uint8_t type);

     int
     bt_devfilter_pkt_tst(const struct bt_devfilter *filter, uint8_t type);

     void
     bt_devfilter_evt_set(struct bt_devfilter *filter, uint8_t event);

     void
     bt_devfilter_evt_clr(struct bt_devfilter *filter, uint8_t event);

     int
     bt_devfilter_evt_tst(const struct bt_devfilter *filter, uint8_t event);

     int
     bt_devinquiry(const char *name, time_t timeout, int max_rsp,
	 struct bt_devinquiry **iip);

DESCRIPTION
     These routines are designed to provide access to locally configured Blue‐
     tooth devices in an operating system independent manner via a socket pro‐
     viding access to Bluetooth HCI packets.

FUNCTIONS
     bt_devaddr(name, bdaddr)
	   Return a Bluetooth device address.  bt_devaddr() will return 1 if
	   the NUL-terminated name string refers to a Bluetooth device present
	   in the system, otherwise 0.	The name may be given as a device name
	   (eg "ubt0") or Bluetooth device address (eg "00:11:22:33:44:55")
	   and the actual device address will be written to bdaddr if not
	   NULL.

     bt_devname(name, bdaddr)
	   Return a Bluetooth device name.  bt_devname() returns 1 if the
	   bdaddr refers to a Bluetooth device present in the system, other‐
	   wise 0.  The name buffer, if given, should have space for at least
	   HCI_DEVNAME_SIZE bytes and the string will be NUL-terminated.

     bt_devenum(cb, arg)
	   Enumerate Bluetooth devices present in the system.  For each device
	   found, the cb function (if not NULL) will be called with the arg
	   argument provided, a fully populated bt_devinfo structure and,
	   where the device is enabled, a socket handle as returned by
	   bt_devopen().  The callback function can halt the enumeration by
	   returning a non-zero value, and bt_devenum() returns the number of
	   successfully enumerated devices.

     bt_devinfo(name, info)
	   Obtain information from a Bluetooth device present in the system.
	   The info argument is a pointer to a bt_devinfo structure into which
	   information about device name is placed.  The bt_devinfo structure
	   contains at least the following members:

		   char	       devname[HCI_DEVNAME_SIZE];
		   int	       enabled;	   /* device is enabled */

		   /* device information */
		   bdaddr_t    bdaddr;
		   uint8_t     features[HCI_FEATURES_SIZE];
		   uint16_t    acl_size;   /* max ACL data size */
		   uint16_t    acl_pkts;   /* total ACL packet buffers */
		   uint16_t    sco_size;   /* max SCO data size */
		   uint16_t    sco_pkts;   /* total SCO packet buffers */

		   /* flow control */
		   uint16_t    cmd_free;   /* available CMD packet buffers */
		   uint16_t    acl_free;   /* available ACL packet buffers */
		   uint16_t    sco_free;   /* available ACL packet buffers */

		   /* statistics */
		   uint32_t    cmd_sent;
		   uint32_t    evnt_recv;
		   uint32_t    acl_recv;
		   uint32_t    acl_sent;
		   uint32_t    sco_recv;
		   uint32_t    sco_sent;
		   uint32_t    bytes_recv;
		   uint32_t    bytes_sent;

		   /* device settings */
		   uint16_t    link_policy_info;
		   uint16_t    packet_type_info;
		   uint16_t    role_switch_info;

	   Because a Bluetooth device must be enabled in order to retrieve
	   information, the enabled flag should be tested to be non-zero
	   before relying on further data.

     bt_devopen(name, flags)
	   Return a Bluetooth HCI socket handle bound and connected to the
	   named Bluetooth device or, if name is NULL, enabled to receive
	   packets from any device.  The socket should be closed using
	   close(2) after use.	Any combination of the following flags may be
	   used to pre-set the socket options:

	   BTOPT_DIRECTION  Enable control messages on each packet indicating
			    the direction of travel.

	   BTOPT_TIMESTAMP  Enable control messages providing packet time‐
			    stamps.

	   The default filter on the socket will only allow the HCI Event
	   packets "Command Status" and "Command Complete" to be received.

     bt_devsend(s, opcode, param, plen)
	   Send an HCI command packet on the socket s.	The opcode should be
	   in host byte order and the param and plen arguments can be used to
	   provide command parameter data.  bt_devsend() will return the num‐
	   ber of bytes successfully written.

     bt_devrecv(s, buf, size, timeout)
	   Receive a single HCI packet on the socket s.	 bt_devrecv() will
	   return the number of bytes successfully received unless the pro‐
	   vided buffer could not contain the entire packet, or if a timeout
	   was requested with a non-negative timeout value.

     bt_devreq(s, req, timeout)
	   Make an HCI request on the socket s.	 The req argument is a pointer
	   to a bt_devreq structure, defined as:

		 struct bt_devreq {
			 uint16_t	 opcode;
			 uint8_t	 event;
			 void		*cparam;
			 size_t		 clen;
			 void		*rparam;
			 size_t		 rlen;
		 };

	   bt_devreq() sends an HCI command packet with the given opcode and
	   command parameters of clen bytes at cparam then waits up to timeout
	   seconds for the command to return a "Command Complete" event.  In
	   the case where the command returns "Command Status" and an addi‐
	   tional event, and where the status indicates that the command is in
	   progress, bt_devreq() will wait for the additional event specified
	   in the request.  If required, any response will be copied into the
	   buffer of rlen bytes at rparam, and rlen will be adjusted to indi‐
	   cate the number of bytes stored.  bt_devreq() temporarily modifies
	   the socket filter.

     bt_devfilter(s, new, old)
	   Update or extract the packet filter on HCI socket s.	 Filters can
	   be set to indicate packet types (Commands, Events, ACL and SCO
	   data), and individual event IDs.  Where old is given, the currently
	   set filter will be extracted first, then if new is given, the fil‐
	   ter will be updated.

     bt_devfilter_pkt_set(filter, type)
	   Set packet type in filter.

     bt_devfilter_pkt_clr(filter, type)
	   Clear packet type from filter.

     bt_devfilter_pkt_tst(filter, type)
	   Test if filter has packet type set.

     bt_devfilter_evt_set(filter, event)
	   Set event ID in filter.

     bt_devfilter_evt_clr(filter, event)
	   Clear event ID from filter.

     bt_devfilter_evt_tst(filter, event)
	   Test if filter has event ID set.

     bt_devinquiry(name, timeout, max_rsp, iip)
	   Perform a Bluetooth Inquiry using the device name, or the first
	   available device if NULL is passed.	The inquiry length will be
	   timeout seconds, and the number of responses (up to a limit of
	   max_rsp) will be returned.  A pointer to an array of bt_devinquiry
	   structures, defined as:

		 struct bt_devinquiry {
			 bdaddr_t	 bdaddr;
			 uint8_t	 pscan_rep_mode;
			 uint8_t	 pscan_period_mode;
			 uint8_t	 dev_class[3];
			 uint16_t	 clock_offset;
			 int8_t		 rssi;
			 uint8_t	 data[240];
		 };

	   will be stored in the location given by iip and this should be
	   released after use with free(3).

RETURN VALUES
     These Bluetooth device access routines return -1 on failure, and errno
     will be set to indicate the error.

ERRORS
     In addition to errors returned by the standard C library IO functions,
     the following errors may be indicated by device access routines.

	   [EINVAL]	A provided function argument was not valid.

	   [EIO]	A device response was not properly understood.

	   [ETIMEDOUT]	An operation exceeded the given time limit.

SEE ALSO
     bluetooth(3)

HISTORY
     The Bluetooth device access API was created by Maksim Yevmenkin and first
     appeared in FreeBSD.  This implementation written for NetBSD by Iain
     Hibbert.

BSD			       October 25, 2011				   BSD
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