platform_hardware_libhardware/include/hardware/bt_sock.h

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

__BEGIN_DECLS

#define BTSOCK_FLAG_ENCRYPT 1
#define BTSOCK_FLAG_AUTH (1 << 1)
#define BTSOCK_FLAG_NO_SDP (1 << 2)

typedef enum {
    BTSOCK_RFCOMM = 1,
    BTSOCK_SCO = 2,
    BTSOCK_L2CAP = 3
} btsock_type_t;

/** Represents the standard BT SOCKET interface. */
typedef struct {
    short size;
    bt_bdaddr_t bd_addr;
    int channel;
    int status;
    
    // The writer must make writes using a buffer of this maximum size
    // to avoid loosing data. (L2CAP only)
    unsigned short max_tx_packet_size;
 
    // The reader must read using a buffer of at least this size to avoid
    // loosing data. (L2CAP only)
    unsigned short max_rx_packet_size;
} __attribute__((packed)) sock_connect_signal_t;

typedef struct {
    /** set to size of this struct*/
    size_t          size;

    /**
     * Listen to a RFCOMM UUID or channel. It returns the socket fd from which
     * btsock_connect_signal can be read out when a remote device connected.
     * If neither a UUID nor a channel is provided, a channel will be allocated
     * and a service record can be created providing the channel number to
     * create_sdp_record(...) in bt_sdp.
     */
    bt_status_t (*listen)(btsock_type_t type, const char* service_name,
            const uint8_t* service_uuid, int channel, int* sock_fd, int flags);

    /**
     * Connect to a RFCOMM UUID channel of remote device, It returns the socket fd from which
     * the btsock_connect_signal and a new socket fd to be accepted can be read out when connected
     */
    bt_status_t (*connect)(const bt_bdaddr_t *bd_addr, btsock_type_t type, const uint8_t* uuid,
            int channel, int* sock_fd, int flags);
} btsock_interface_t;

__END_DECLS