BLUETOOTH(4)            NetBSD Kernel Interfaces Manual           BLUETOOTH(4)

NAME
     bluetooth -- Bluetooth Protocol Family

SYNOPSIS
     #include <netbt/bluetooth.h>
     #include <netbt/hci.h>
     #include <netbt/l2cap.h>
     #include <netbt/rfcomm.h>

DESCRIPTION
     The Bluetooth Protocol Family

ADDRESSING
     Bluetooth Protocol Family sockets all use a sockaddr_bt structure which
     contains a Bluetooth Device Address (BDADDR).  This consists of a six
     byte string in least significant byte first order.

            struct sockaddr_bt {
                    uint8_t         bt_len;
                    sa_family_t     bt_family;
                    bdaddr_t        bt_bdaddr;
                    uint16_t        bt_psm;
                    uint8_t         bt_channel;
            };

     The local address used by the socket can be set with bind(2).

PROTOCOLS
     Protocols included are:

     BTPROTO_HCI
         This gives raw access to the Host Controller Interface of local
         devices using the HCI protocol as described in the Bluetooth Core
         Specification.  Any user may open an HCI socket but there are limita-
         tions on what unprivileged users can send and receive. The local
         address specified by bind(2) may be used to select the device that
         the socket will receive packets from. If BDADDR_ANY is specified then
         the socket will receive packets from all devices on the system.
         connect(2) may be used to create connections such that packets sent
         with send(2) will be delivered to the specified device, otherwise
         sendto(2) should be used.

         The bt_psm and bt_channel fields in the sockaddr_bt structure are
         ignored by HCI protocol code and should be set to zero.

         HCI socket options:

         SO_HCI_EVT_FILTER [struct hci_filter]
             This filter controls which events will be received at the socket.
             See <netbt/hci.h> for available events. By default, Command_Com-
             plete and Command_Status events only are enabled.

         SO_HCI_PKT_FILTER [struct hci_filter]
             This filter controls the type of packets that will be received at
             the socket. By default, Event packets only are enabled.

         SO_HCI_DIRECTION [int]
             When set, this enables control messages on packets received at
             the socket indicating the direction of travel of the packet.

         HCI sysctl(8) controls:

         net.bluetooth.hci.sendspace
              Default send buffer size for HCI sockets.

         net.bluetooth.hci.recvspace
              Default receive buffer size for HCI sockets

         net.bluetooth.hci.acl_expiry
              If set, this is the time in seconds after which unused ACL data
              connections will be expired. If zero, connections will not be
              closed.

         net.bluetooth.hci.memo_expiry
              Time, in seconds, that the system will keep records of Bluetooth
              devices in the vicinity after an Inquiry Response packet has
              been received. This information is used for routing purposes.

         net.bluetooth.hci.eventq_max
              The maximum number of packets on the low level Event queue.

         net.bluetooth.hci.aclrxq_max
              The maximum number of packets on the low level ACL queue.

         net.bluetooth.hci.scorxq_max
              The maximum number of packets on the low level SCO queue.

     BTPROTO_L2CAP
         L2CAP sockets give sequential packet access over channels to other
         Bluetooth devices and make use of the bt_psm field in the sockaddr_bt
         structure to select the Protocol/Sevice Multiplexer to specify when
         making connections.

         L2CAP socket options:

         SO_L2CAP_IMTU [uint16_t]
              Incoming MTU

         SO_L2CAP_OMTU [uint16_t]
              Outgoing MTU (read-only)

         SO_L2CAP_LM [int]
              Link Mode.  The following bits may be set:

              L2CAP_LM_AUTH     Request authentication (pairing).
              L2CAP_LM_ENCRYPT  Request encryption (includes auth).
              L2CAP_LM_SECURE   Request secured link (encryption, plus change
                                link key).

              Link mode settings will be applied to the baseband link during
              L2CAP connection establishment.  If the L2CAP connection is
              already established, EINPROGRESS may be returned, and it is not
              possible to guarantee that data already queued (from either end)
              will not be delivered.  If the mode change fails, the L2CAP con-
              nection will be aborted.

         L2CAP sysctl(8) controls:

         net.bluetooth.l2cap.sendspace
              Default send buffer size for L2CAP sockets.

         net.bluetooth.l2cap.recvspace
              Default receive buffer size for L2CAP sockets.

         net.bluetooth.l2cap.rtx
              Response Timeout eXpiry for L2CAP signals.

         net.bluetooth.l2cap.ertx
              Extended Response Timeout eXpiry for L2CAP signals.

     BTPROTO_RFCOMM
         RFCOMM sockets provide streamed data over Bluetooth connection and
         make use of the bt_psm, and bt_channel fields in the sockaddr_bt
         structure.  The channel number must be between 1 and 30 inclusive
         except that if the special value RFCOMM_CHANNEL_ANY is bound, when
         the listen(2) call is made, the first unused channel for the relevant
         bdaddr will be allocated and may be discovered using the
         getsockname(2) call.  If no PSM is specified, a default value of
         L2CAP_PSM_RFCOMM (0x0003) will be used.

         RFCOMM socket options:

         SO_RFCOMM_MTU [uint16_t]
              Maximum Frame Size to use for this link.

         SO_RFCOMM_LM [int]
              Link Mode.  The following bits may be set at any time:

              RFCOMM_LM_AUTH     Request authentication (pairing).
              RFCOMM_LM_ENCRYPT  Request encryption (includes auth).
              RFCOMM_LM_SECURE   Request secured link (encryption, plus change
                                 link key).

              Link mode settings will be applied to the baseband link during
              RFCOMM connection establishment.  If the RFCOMM connection is
              already established, EINPROGRESS may be returned, and it is not
              possible to guarantee that data already queued (from either end)
              will not be delivered.  If the mode change fails, the RFCOMM
              connection will be aborted.

         RFCOMM sysctl(8) controls:

         net.bluetooth.rfcomm.sendspace
              Default send buffer size for RFCOMM sockets.

         net.bluetooth.rfcomm.recvspace
              Default receive buffer size for RFCOMM sockets.

         net.bluetooth.rfcomm.default_mtu
              Maximum Frame Size (N1)

         net.bluetooth.ack_timeout
              Acknowledgement Timer (T1)

         net.bluetooth.mcc_timeout
              Response Timer for Multiplexer Control Channel (T2)

     BTPROTO_SCO
         SCO sockets provide sequential packet access to time sensitive data
         channels over Bluetooth connections, typically used for audio data.

         SCO socket options:

         SO_SCO_MTU [uint16_t]
              Maximum packet size for use on this link.  This is read-only and
              will be set by the protocol code when a connection is made.
              Currently, due to limitations in the ubt(4) driver, the SCO pro-
              tocol code will only accept packets with exactly this size.

         SO_SCO_HANDLE [uint16_t]
              Connection handle for this link.  This is read-only and provided
              for informational purposes only.

         SCO sysctl(8) controls:

         net.bluetooth.sco.sendspace
              Default send buffer size for SCO sockets.

         net.bluetooth.sco.recvspace
              Default receive buffer size for SCO sockets.

INFORMATION
     The following ioctl(2) calls may be used to manipulate Bluetooth devices.
     The ioctl(2) must be made on BTPROTO_HCI sockets. All of the requests
     take a btreq structure defined as follows as their parameter and unless
     otherwise specified, use the btr_name field to identify the device.

     struct btreq {
         char btr_name[HCI_DEVNAME_SIZE];    /* device name */

         union {
             struct {
                 bdaddr_t btri_bdaddr;       /* device bdaddr */
                 uint16_t btri_flags;        /* flags */
                 uint16_t btri_num_cmd;      /* # of free cmd buffers */
                 uint16_t btri_num_acl;      /* # of free ACL buffers */
                 uint16_t btri_num_sco;      /* # of free SCO buffers */
                 uint16_t btri_acl_mtu;      /* ACL mtu */
                 uint16_t btri_sco_mtu;      /* SCO mtu */
                 uint16_t btri_link_policy;  /* Link Policy */
                 uint16_t btri_packet_type;  /* Packet Type */
             } btri;
             struct bt_stats btrs;   /* unit stats */
         } btru;
     };

     #define btr_flags       btru.btri.btri_flags
     #define btr_bdaddr      btru.btri.btri_bdaddr
     #define btr_num_cmd     btru.btri.btri_num_cmd
     #define btr_num_acl     btru.btri.btri_num_acl
     #define btr_num_sco     btru.btri.btri_num_sco
     #define btr_acl_mtu     btru.btri.btri_acl_mtu
     #define btr_sco_mtu     btru.btri.btri_sco_mtu
     #define btr_link_policy btru.btri.btri_link_policy
     #define btr_packet_type btru.btri.btri_packet_type
     #define btr_stats       btru.btrs

     /* btr_flags */
     #define BTF_UP                  (1<<0)  /* unit is up */
     #define BTF_RUNNING             (1<<1)  /* unit is running */
     #define BTF_XMIT_CMD            (1<<2)  /* transmitting CMD packets */
     #define BTF_XMIT_ACL            (1<<3)  /* transmitting ACL packets */
     #define BTF_XMIT_SCO            (1<<4)  /* transmitting SCO packets */
     #define BTF_INIT_BDADDR         (1<<5)  /* waiting for bdaddr */
     #define BTF_INIT_BUFFER_SIZE    (1<<6)  /* waiting for buffer size */
     #define BTF_INIT_FEATURES       (1<<7)  /* waiting for features */
     #define BTF_NOOP_ON_RESET       (1<<8)  /* wait for No-op on reset */
     #define BTF_INIT_COMMANDS       (1<<9)  /* waiting for supported commands */

     struct bt_stats {
             uint32_t        err_tx;
             uint32_t        err_rx;
             uint32_t        cmd_tx;
             uint32_t        evt_rx;
             uint32_t        acl_tx;
             uint32_t        acl_rx;
             uint32_t        sco_tx;
             uint32_t        sco_rx;
             uint32_t        byte_tx;
             uint32_t        byte_rx;
     };


     SIOCGBTINFO    Get Bluetooth device Info. Given the device name, fill in
                    the btreq structure including the address field for use
                    with socket addressing as above.

     SIOCGBTINFOA   Get Bluetooth device Info from Address. Given the device
                    address, fill in the btreq structure including the name
                    field.

     SIOCNBTINFO    Next Bluetooth device Info . If name field is empty, the
                    first device will be returned. Otherwise, the next device
                    will be returned. Thus, you can cycle through all devices
                    in the system.

     SIOCSBTFLAGS   Set Bluetooth device Flags. Not all flags are settable.

     SIOCSBTPOLICY  Set Bluetooth device Link Policy. Link Policy bits are
                    defined in <netbt/hci.h>, though you can only set bits
                    that the device supports.

     SIOCSBTPTYPE   Set Bluetooth device Packet Types. You can only set packet
                    types that the device supports.

     SIOCGBTSTATS   Read device statistics.

     SIOCZBTSTATS   Read device statistics, and zero them.

     Only the super-user may change device configurations.

SEE ALSO
     bind(2), getsockname(2), bluetooth(3), bcsp(4), bt3c(4), btbc(4),
     btuart(4), options(4), ubt(4)

HISTORY
     The Bluetooth Protocol Stack was written for NetBSD 4.0 by Iain Hibbert
     under the sponsorship of Itronix, Inc.

NetBSD 5.0_RC4                 December 28, 2007                NetBSD 5.0_RC4

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