/* * Copyright (C) 2014 BlueKitchen GmbH * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the copyright holders nor the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * 4. Any redistribution, use, or modification is done solely for * personal benefit and not for any commercial purpose or for * monetary gain. * * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Please inquire about commercial licensing options at * contact@bluekitchen-gmbh.com * */ #define __BTSTACK_FILE__ "sdp_bnep_query.c" // ***************************************************************************** /* EXAMPLE_START(sdp_bnep_query): Dump remote BNEP PAN protocol UUID and L2CAP PSM * * @text The example shows how the SDP Client is used to get all BNEP service * records from a remote device. It extracts the remote BNEP PAN protocol * UUID and the L2CAP PSM, which are needed to connect to a remote BNEP service. */ // ***************************************************************************** #include "btstack_config.h" #include #include #include #include #include "btstack.h" int record_id = -1; int attribute_id = -1; static uint8_t attribute_value[1000]; static const int attribute_value_buffer_size = sizeof(attribute_value); static bd_addr_t remote = {0x04,0x0C,0xCE,0xE4,0x85,0xD3}; static btstack_packet_callback_registration_t hci_event_callback_registration; static void assertBuffer(int size){ if (size > attribute_value_buffer_size){ printf("SDP attribute value buffer size exceeded: available %d, required %d", attribute_value_buffer_size, size); } } /* @section SDP Client Setup * * @text As with the previous example, you must register a * callback, i.e. query handler, with the SPD parser, as shown in * Listing SDPClientInit. Via this handler, the SDP client will receive events: * - SDP_EVENT_QUERY_ATTRIBUTE_VALUE containing the results of the query in chunks, * - SDP_EVENT_QUERY_COMPLETE reporting the status and the end of the query. */ /* LISTING_START(SDPClientInit): SDP client setup */ static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); static void sdp_client_init(void){ // register for HCI events hci_event_callback_registration.callback = &packet_handler; hci_add_event_handler(&hci_event_callback_registration); // init L2CAP l2cap_init(); } /* LISTING_END */ /* @section SDP Client Query * To trigger an SDP query to get the a list of service records on a remote device, * you need to call sdp_client_query_uuid16() with the remote address and the * BNEP protocol UUID, as shown in Listing SDPQueryUUID. * In this example we again used fixed address of the remote device. Please update * for your environment. */ /* LISTING_START(SDPQueryUUID): Querying the a list of service records on a remote device. */ static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ UNUSED(channel); UNUSED(size); if (packet_type != HCI_EVENT_PACKET) return; uint8_t event = hci_event_packet_get_type(packet); switch (event) { case BTSTACK_EVENT_STATE: // BTstack activated, get started if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){ printf("Start SDP BNEP query.\n"); sdp_client_query_uuid16(&handle_sdp_client_query_result, remote, BLUETOOTH_PROTOCOL_BNEP); } break; default: break; } } /* LISTING_END */ static char * get_string_from_data_element(uint8_t * element){ de_size_t de_size = de_get_size_type(element); int pos = de_get_header_size(element); int len = 0; switch (de_size){ case DE_SIZE_VAR_8: len = element[1]; break; case DE_SIZE_VAR_16: len = big_endian_read_16(element, 1); break; default: break; } char * str = (char*)malloc(len+1); memcpy(str, &element[pos], len); str[len] ='\0'; return str; } /* @section Handling SDP Client Query Result * * @text The SDP Client returns the result of the query in chunks. Each result * packet contains the record ID, the Attribute ID, and a chunk of the Attribute * value, see Listing HandleSDPQUeryResult. Here, we show how to parse the * Service Class ID List and Protocol Descriptor List, as they contain * the BNEP Protocol UUID and L2CAP PSM respectively. */ /* LISTING_START(HandleSDPQUeryResult): Extracting BNEP Protcol UUID and L2CAP PSM */ static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ UNUSED(packet_type); UNUSED(channel); UNUSED(size); /* LISTING_PAUSE */ des_iterator_t des_list_it; des_iterator_t prot_it; char *str; switch (hci_event_packet_get_type(packet)){ case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: // handle new record if (sdp_event_query_attribute_byte_get_record_id(packet) != record_id){ record_id = sdp_event_query_attribute_byte_get_record_id(packet); printf("\n---\nRecord nr. %u\n", record_id); } assertBuffer(sdp_event_query_attribute_byte_get_attribute_length(packet)); attribute_value[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)){ /* LISTING_RESUME */ /* @text The Service Class ID List is a Data Element Sequence (DES) of UUIDs. * The BNEP PAN protocol UUID is within this list. */ switch(sdp_event_query_attribute_byte_get_attribute_id(packet)){ // 0x0001 "Service Class ID List" case BLUETOOTH_ATTRIBUTE_SERVICE_CLASS_ID_LIST: if (de_get_element_type(attribute_value) != DE_DES) break; for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)){ uint8_t * element = des_iterator_get_element(&des_list_it); if (de_get_element_type(element) != DE_UUID) continue; uint32_t uuid = de_get_uuid32(element); switch (uuid){ case BLUETOOTH_SERVICE_CLASS_PANU: case BLUETOOTH_SERVICE_CLASS_NAP: case BLUETOOTH_SERVICE_CLASS_GN: printf(" ** Attribute 0x%04x: BNEP PAN protocol UUID: %04x\n", sdp_event_query_attribute_byte_get_attribute_id(packet), uuid); break; default: break; } } break; /* LISTING_PAUSE */ // 0x0100 "Service Name" case 0x0100: // 0x0101 "Service Description" case 0x0101: str = get_string_from_data_element(attribute_value); printf(" ** Attribute 0x%04x: %s\n", sdp_event_query_attribute_byte_get_attribute_id(packet), str); free(str); break; /* LISTING_RESUME */ /* @text The Protocol Descriptor List is DES * which contains one DES for each protocol. For PAN serivces, it contains * a DES with the L2CAP Protocol UUID and a PSM, * and another DES with the BNEP UUID and the the BNEP version. */ case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST:{ printf(" ** Attribute 0x%04x: ", sdp_event_query_attribute_byte_get_attribute_id(packet)); uint16_t l2cap_psm = 0; uint16_t bnep_version = 0; for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)){ if (des_iterator_get_type(&des_list_it) != DE_DES) continue; uint8_t * des_element = des_iterator_get_element(&des_list_it); des_iterator_init(&prot_it, des_element); uint8_t * element = des_iterator_get_element(&prot_it); if (de_get_element_type(element) != DE_UUID) continue; uint32_t uuid = de_get_uuid32(element); switch (uuid){ case BLUETOOTH_PROTOCOL_L2CAP: if (!des_iterator_has_more(&prot_it)) continue; des_iterator_next(&prot_it); de_element_get_uint16(des_iterator_get_element(&prot_it), &l2cap_psm); break; case BLUETOOTH_PROTOCOL_BNEP: if (!des_iterator_has_more(&prot_it)) continue; des_iterator_next(&prot_it); de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_version); break; default: break; } } printf("l2cap_psm 0x%04x, bnep_version 0x%04x\n", l2cap_psm, bnep_version); } break; /* LISTING_PAUSE */ default: break; } } break; case SDP_EVENT_QUERY_COMPLETE: printf("General query done with status %d.\n\n", sdp_event_query_complete_get_status(packet)); break; } /* LISTING_RESUME */ } /* LISTING_END */ int btstack_main(int argc, const char * argv[]); int btstack_main(int argc, const char * argv[]){ (void)argc; (void)argv; printf("Client HCI init done\r\n"); sdp_client_init(); // turn on! hci_power_control(HCI_POWER_ON); return 0; } /* EXAMPLE_END */