1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 39 /** 40 * Dispatcher for independent implementation of ATT client and server 41 */ 42 43 #include "att_dispatch.h" 44 #include "ble/core.h" 45 #include "btstack_debug.h" 46 #include "l2cap.h" 47 48 static btstack_packet_handler_t att_client_handler; 49 static btstack_packet_handler_t att_server_handler; 50 51 static uint8_t att_client_waiting_for_can_send; 52 static uint8_t att_server_waiting_for_can_send; 53 54 static void att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 55 switch (packet_type){ 56 case ATT_DATA_PACKET: 57 // log_info("att_data_packet with opcode 0x%x", packet[0]); 58 if (packet[0] & 1){ 59 // odd PDUs are sent from server to client 60 if (!att_client_handler) return; 61 att_client_handler(packet_type, handle, packet, size); 62 } else { 63 // even PDUs are sent from client to server 64 if (!att_server_handler) return; 65 att_server_handler(packet_type, handle, packet, size); 66 } 67 break; 68 case HCI_EVENT_PACKET: 69 if (packet[0] != L2CAP_EVENT_CAN_SEND_NOW) break; 70 if (att_server_handler && att_server_waiting_for_can_send){ 71 att_server_waiting_for_can_send = 0; 72 att_server_handler(packet_type, handle, packet, size); 73 // stop if client cannot send anymore 74 if (!hci_can_send_acl_le_packet_now()) break; 75 } 76 if (att_client_handler && att_client_waiting_for_can_send){ 77 att_client_waiting_for_can_send = 0; 78 att_client_handler(packet_type, handle, packet, size); 79 } 80 break; 81 default: 82 break; 83 } 84 } 85 86 /** 87 * @brief reset att dispatchter 88 * @param packet_hander for ATT client packets 89 */ 90 void att_dispatch_register_client(btstack_packet_handler_t packet_handler){ 91 att_client_handler = packet_handler; 92 l2cap_register_fixed_channel(att_packet_handler, L2CAP_CID_ATTRIBUTE_PROTOCOL); 93 } 94 95 /** 96 * @brief reset att dispatchter 97 * @param packet_hander for ATT server packets 98 */ 99 void att_dispatch_register_server(btstack_packet_handler_t packet_handler){ 100 att_server_handler = packet_handler; 101 l2cap_register_fixed_channel(att_packet_handler, L2CAP_CID_ATTRIBUTE_PROTOCOL); 102 } 103 104 /** 105 * @brief can send packet for client 106 * @param handle 107 */ 108 int att_dispatch_client_can_send_now(hci_con_handle_t con_handle){ 109 return l2cap_can_send_fixed_channel_packet_now(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL); 110 } 111 112 /** 113 * @brief can send packet for server 114 * @param handle 115 */ 116 int att_dispatch_server_can_send_now(hci_con_handle_t con_handle){ 117 return l2cap_can_send_fixed_channel_packet_now(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL); 118 } 119 120 /** 121 * @brief Request emission of L2CAP_EVENT_CAN_SEND_NOW as soon as possible for client 122 * @note L2CAP_EVENT_CAN_SEND_NOW might be emitted during call to this function 123 * so packet handler should be ready to handle it 124 * @param con_handle 125 */ 126 void att_dispatch_client_request_can_send_now_event(hci_con_handle_t con_handle){ 127 att_client_waiting_for_can_send = 1; 128 l2cap_request_can_send_fix_channel_now_event(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL); 129 } 130 131 /** 132 * @brief Request emission of L2CAP_EVENT_CAN_SEND_NOW as soon as possible for server 133 * @note L2CAP_EVENT_CAN_SEND_NOW might be emitted during call to this function 134 * so packet handler should be ready to handle it 135 * @param con_handle 136 */ 137 void att_dispatch_server_request_can_send_now_event(hci_con_handle_t con_handle){ 138 att_server_waiting_for_can_send = 1; 139 l2cap_request_can_send_fix_channel_now_event(con_handle, L2CAP_CID_ATTRIBUTE_PROTOCOL); 140 } 141