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 "l2cap.h" 44 45 #include "att_dispatch.h" 46 #include "btstack_debug.h" 47 48 static void dummy_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size); 49 50 static btstack_packet_handler_t att_client_handler = &dummy_packet_handler; 51 static btstack_packet_handler_t att_server_handler = &dummy_packet_handler; 52 53 static btstack_packet_callback_registration_t hci_event_callback_registration; 54 55 static int registered_for_hci_events = 0; 56 57 static void dummy_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 58 } 59 60 static void att_hci_event_handler(uint8_t packet_type, uint8_t * packet, uint16_t size){ 61 att_server_handler(packet_type, 0, packet, size); 62 } 63 64 static void att_dispatch_register_for_hci_events(void){ 65 if (registered_for_hci_events) return; 66 registered_for_hci_events = 1; 67 hci_event_callback_registration.callback = &att_hci_event_handler; 68 hci_add_event_handler(&hci_event_callback_registration); 69 } 70 71 static void att_packet_handler(uint8_t packet_type, uint16_t handle, uint8_t *packet, uint16_t size){ 72 if (packet_type != ATT_DATA_PACKET) return; 73 74 // log_info("att_data_packet with opcode 0x%x", packet[0]); 75 uint8_t att_pdu_odd = packet[0] & 1; 76 if (att_pdu_odd){ 77 // odd PDUs are sent from server to client 78 att_client_handler(packet_type, handle, packet, size); 79 } else { 80 // even PDUs are sent from client to server 81 att_server_handler(packet_type, handle, packet, size); 82 } 83 } 84 85 /** 86 * @brief reset att dispatchter 87 * @param packet_hander for ATT client packets 88 */ 89 void att_dispatch_register_client(btstack_packet_handler_t packet_handler){ 90 att_dispatch_register_for_hci_events(); 91 if (packet_handler == NULL){ 92 packet_handler = dummy_packet_handler; 93 } 94 att_client_handler = packet_handler; 95 l2cap_register_fixed_channel(att_packet_handler, L2CAP_CID_ATTRIBUTE_PROTOCOL); 96 } 97 98 /** 99 * @brief reset att dispatchter 100 * @param packet_hander for ATT server packets 101 */ 102 void att_dispatch_register_server(btstack_packet_handler_t packet_handler){ 103 att_dispatch_register_for_hci_events(); 104 if (packet_handler == NULL){ 105 packet_handler = dummy_packet_handler; 106 } 107 att_server_handler = packet_handler; 108 l2cap_register_fixed_channel(att_packet_handler, L2CAP_CID_ATTRIBUTE_PROTOCOL); 109 } 110