include/hardware/bt_gatt_client.h

/*
 * Copyright (C) 2013 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.
 */


#ifndef ANDROID_INCLUDE_BT_GATT_CLIENT_H
#define ANDROID_INCLUDE_BT_GATT_CLIENT_H

#include <stdint.h>
#include <vector>
#include "bt_gatt_types.h"
#include "bt_common_types.h"

__BEGIN_DECLS

/**
 * Buffer sizes for maximum attribute length and maximum read/write
 * operation buffer size.
 */
#define BTGATT_MAX_ATTR_LEN 600

/** Buffer type for unformatted reads/writes */
typedef struct
{
    uint8_t             value[BTGATT_MAX_ATTR_LEN];
    uint16_t            len;
} btgatt_unformatted_value_t;

/** Parameters for GATT read operations */
typedef struct
{
    uint16_t           handle;
    btgatt_unformatted_value_t value;
    uint16_t            value_type;
    uint8_t             status;
} btgatt_read_params_t;

/** Parameters for GATT write operations */
typedef struct
{
    btgatt_srvc_id_t    srvc_id;
    btgatt_gatt_id_t    char_id;
    btgatt_gatt_id_t    descr_id;
    uint8_t             status;
} btgatt_write_params_t;

/** Attribute change notification parameters */
typedef struct
{
    uint8_t             value[BTGATT_MAX_ATTR_LEN];
    bt_bdaddr_t         bda;
    uint16_t            handle;
    uint16_t            len;
    uint8_t             is_notify;
} btgatt_notify_params_t;

typedef struct
{
    bt_bdaddr_t        *bda1;
    bt_uuid_t          *uuid1;
    uint16_t            u1;
    uint16_t            u2;
    uint16_t            u3;
    uint16_t            u4;
    uint16_t            u5;
} btgatt_test_params_t;

/* BT GATT client error codes */
typedef enum
{
    BT_GATTC_COMMAND_SUCCESS = 0,    /* 0  Command succeeded                 */
    BT_GATTC_COMMAND_STARTED,        /* 1  Command started OK.               */
    BT_GATTC_COMMAND_BUSY,           /* 2  Device busy with another command  */
    BT_GATTC_COMMAND_STORED,         /* 3 request is stored in control block */
    BT_GATTC_NO_RESOURCES,           /* 4  No resources to issue command     */
    BT_GATTC_MODE_UNSUPPORTED,       /* 5  Request for 1 or more unsupported modes */
    BT_GATTC_ILLEGAL_VALUE,          /* 6  Illegal command /parameter value  */
    BT_GATTC_INCORRECT_STATE,        /* 7  Device in wrong state for request  */
    BT_GATTC_UNKNOWN_ADDR,           /* 8  Unknown remote BD address         */
    BT_GATTC_DEVICE_TIMEOUT,         /* 9  Device timeout                    */
    BT_GATTC_INVALID_CONTROLLER_OUTPUT,/* 10  An incorrect value was received from HCI */
    BT_GATTC_SECURITY_ERROR,          /* 11 Authorization or security failure or not authorized  */
    BT_GATTC_DELAYED_ENCRYPTION_CHECK, /*12 Delayed encryption check */
    BT_GATTC_ERR_PROCESSING           /* 12 Generic error                     */
} btgattc_error_t;

/** BT-GATT Client callback structure. */

/** Callback invoked in response to register_client */
typedef void (*register_client_callback)(int status, int client_if,
                bt_uuid_t *app_uuid);

/** GATT open callback invoked in response to open */
typedef void (*connect_callback)(int conn_id, int status, int client_if, bt_bdaddr_t* bda);

/** Callback invoked in response to close */
typedef void (*disconnect_callback)(int conn_id, int status,
                int client_if, bt_bdaddr_t* bda);

/**
 * Invoked in response to search_service when the GATT service search
 * has been completed.
 */
typedef void (*search_complete_callback)(int conn_id, int status);

/** Callback invoked in response to [de]register_for_notification */
typedef void (*register_for_notification_callback)(int conn_id,
                int registered, int status, uint16_t handle);

/**
 * Remote device notification callback, invoked when a remote device sends
 * a notification or indication that a client has registered for.
 */
typedef void (*notify_callback)(int conn_id, btgatt_notify_params_t *p_data);

/** Reports result of a GATT read operation */
typedef void (*read_characteristic_callback)(int conn_id, int status,
                btgatt_read_params_t *p_data);

/** GATT write characteristic operation callback */
typedef void (*write_characteristic_callback)(int conn_id, int status, uint16_t handle);

/** GATT execute prepared write callback */
typedef void (*execute_write_callback)(int conn_id, int status);

/** Callback invoked in response to read_descriptor */
typedef void (*read_descriptor_callback)(int conn_id, int status,
                btgatt_read_params_t *p_data);

/** Callback invoked in response to write_descriptor */
typedef void (*write_descriptor_callback)(int conn_id, int status, uint16_t handle);

/** Callback triggered in response to read_remote_rssi */
typedef void (*read_remote_rssi_callback)(int client_if, bt_bdaddr_t* bda,
                                          int rssi, int status);

/** Callback invoked when the MTU for a given connection changes */
typedef void (*configure_mtu_callback)(int conn_id, int status, int mtu);


/**
 * Callback notifying an application that a remote device connection is currently congested
 * and cannot receive any more data. An application should avoid sending more data until
 * a further callback is received indicating the congestion status has been cleared.
 */
typedef void (*congestion_callback)(int conn_id, bool congested);

/** GATT get database callback */
typedef void (*get_gatt_db_callback)(int conn_id, btgatt_db_element_t *db, int count);

/** GATT services between start_handle and end_handle were removed */
typedef void (*services_removed_callback)(int conn_id, uint16_t start_handle, uint16_t end_handle);

/** GATT services were added */
typedef void (*services_added_callback)(int conn_id, btgatt_db_element_t *added, int added_count);

typedef struct {
    register_client_callback            register_client_cb;
    connect_callback                    open_cb;
    disconnect_callback                 close_cb;
    search_complete_callback            search_complete_cb;
    register_for_notification_callback  register_for_notification_cb;
    notify_callback                     notify_cb;
    read_characteristic_callback        read_characteristic_cb;
    write_characteristic_callback       write_characteristic_cb;
    read_descriptor_callback            read_descriptor_cb;
    write_descriptor_callback           write_descriptor_cb;
    execute_write_callback              execute_write_cb;
    read_remote_rssi_callback           read_remote_rssi_cb;
    configure_mtu_callback              configure_mtu_cb;
    congestion_callback                 congestion_cb;
    get_gatt_db_callback                get_gatt_db_cb;
    services_removed_callback           services_removed_cb;
    services_added_callback             services_added_cb;
} btgatt_client_callbacks_t;

/** Represents the standard BT-GATT client interface. */

typedef struct {
    /** Registers a GATT client application with the stack */
    bt_status_t (*register_client)( bt_uuid_t *uuid );

    /** Unregister a client application from the stack */
    bt_status_t (*unregister_client)(int client_if );

    /** Create a connection to a remote LE or dual-mode device */
    bt_status_t (*connect)( int client_if, const bt_bdaddr_t *bd_addr,
                         bool is_direct, int transport );

    /** Disconnect a remote device or cancel a pending connection */
    bt_status_t (*disconnect)( int client_if, const bt_bdaddr_t *bd_addr,
                    int conn_id);

    /** Clear the attribute cache for a given device */
    bt_status_t (*refresh)( int client_if, const bt_bdaddr_t *bd_addr );

    /**
     * Enumerate all GATT services on a connected device.
     * Optionally, the results can be filtered for a given UUID.
     */
    bt_status_t (*search_service)(int conn_id, bt_uuid_t *filter_uuid );

    /** Read a characteristic on a remote device */
    bt_status_t (*read_characteristic)( int conn_id, uint16_t handle,
                    int auth_req );

    /** Write a remote characteristic */
    bt_status_t (*write_characteristic)(int conn_id, uint16_t handle,
                    int write_type, int auth_req,
                    std::vector<uint8_t> value);

    /** Read the descriptor for a given characteristic */
    bt_status_t (*read_descriptor)(int conn_id, uint16_t handle, int auth_req);

    /** Write a remote descriptor for a given characteristic */
    bt_status_t (*write_descriptor)( int conn_id, uint16_t handle,
                                     int auth_req, std::vector<uint8_t> value);

    /** Execute a prepared write operation */
    bt_status_t (*execute_write)(int conn_id, int execute);

    /**
     * Register to receive notifications or indications for a given
     * characteristic
     */
    bt_status_t (*register_for_notification)( int client_if,
                    const bt_bdaddr_t *bd_addr, uint16_t handle);

    /** Deregister a previous request for notifications/indications */
    bt_status_t (*deregister_for_notification)( int client_if,
                    const bt_bdaddr_t *bd_addr, uint16_t handle);

    /** Request RSSI for a given remote device */
    bt_status_t (*read_remote_rssi)( int client_if, const bt_bdaddr_t *bd_addr);

    /** Determine the type of the remote device (LE, BR/EDR, Dual-mode) */
    int (*get_device_type)( const bt_bdaddr_t *bd_addr );

    /** Configure the MTU for a given connection */
    bt_status_t (*configure_mtu)(int conn_id, int mtu);

    /** Request a connection parameter update */
    bt_status_t (*conn_parameter_update)(const bt_bdaddr_t *bd_addr, int min_interval,
                    int max_interval, int latency, int timeout);

    /** Test mode interface */
    bt_status_t (*test_command)( int command, btgatt_test_params_t* params);

    /** Get gatt db content */
    bt_status_t (*get_gatt_db)( int conn_id);

} btgatt_client_interface_t;

__END_DECLS

#endif /* ANDROID_INCLUDE_BT_GATT_CLIENT_H */