ATT Dispatch API

src/ble/att_dispatch.h : Dispatcher for independent implementation of ATT client and server.

/**
 * @brief Register packet handler for ATT Client PDUs
 * @param packet_handler
 */
void att_dispatch_register_client(btstack_packet_handler_t packet_handler);

/**
 * @brief Register packet handler for ATT Server PDUs
 * @param packet_handler
 */
void att_dispatch_register_server(btstack_packet_handler_t packet_handler);

/**
 * @brief Register L2CAP ATT Service with fixed PSM
 * @note requires ENABLE_GATT_OVER_CLASSIC
 */
void att_dispatch_classic_register_service(void);

/**
 * @brief Create L2CAP ATT Connection
 * @note ENABLE_GATT_OVER_CLASSIC
 * @param address
 * @param l2cap_psm
 */
uint8_t att_dispatch_classic_connect(bd_addr_t address, uint16_t l2cap_psm, uint16_t *out_cid);

/**
 * @brief can send packet for client
 * @param con_handle
 */
bool att_dispatch_client_can_send_now(hci_con_handle_t con_handle);

/**
 * @brief can send packet for server
 * @param con_handle
 */
bool att_dispatch_server_can_send_now(hci_con_handle_t con_handle);

/** 
 * @brief Request emission of L2CAP_EVENT_CAN_SEND_NOW as soon as possible for client
 * @note L2CAP_EVENT_CAN_SEND_NOW might be emitted during call to this function
 *       so packet handler should be ready to handle it
 * @param con_handle
 */
void att_dispatch_client_request_can_send_now_event(hci_con_handle_t con_handle);

/** 
 * @brief Request emission of L2CAP_EVENT_CAN_SEND_NOW as soon as possible for server
 * @note L2CAP_EVENT_CAN_SEND_NOW might be emitted during call to this function
 *       so packet handler should be ready to handle it
 * @param con_handle
 */
void att_dispatch_server_request_can_send_now_event(hci_con_handle_t con_handle);

/** 
* @brief Used for propogating a updated MTU from att_server to gatt_client
* @param con_handle
* @param mtu
*/
void att_dispatch_server_mtu_exchanged(hci_con_handle_t con_handle, uint16_t new_mtu);

/**
* @brief Used for propogating a updated MTU from gatt_client to att_server
* @param con_handle
* @param mtu
*/
void att_dispatch_client_mtu_exchanged(hci_con_handle_t con_handle, uint16_t new_mtu);