/* * Copyright (C) 2017 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__ "hid_host_demo.c" /* * hid_host_demo.c */ /* EXAMPLE_START(hid_host_demo): HID Host Demo * * @text This example implements an HID Host. For now, it connnects to a fixed device, queries the HID SDP * record and opens the HID Control + Interrupt channels */ #include #include "btstack_config.h" #include "btstack.h" #define MAX_ATTRIBUTE_VALUE_SIZE 300 // SDP static uint8_t hid_descriptor[MAX_ATTRIBUTE_VALUE_SIZE]; static uint16_t hid_descriptor_len; static uint16_t hid_control_psm; static uint16_t hid_interrupt_psm; static uint8_t attribute_value[MAX_ATTRIBUTE_VALUE_SIZE]; static const unsigned int attribute_value_buffer_size = MAX_ATTRIBUTE_VALUE_SIZE; // L2CAP static uint16_t l2cap_hid_control_cid; static uint16_t l2cap_hid_interrupt_cid; // MBP 2016 static const char * remote_addr_string = "F4-0F-24-3B-1B-E1"; // iMpulse static const char * remote_addr_string = "64:6E:6C:C1:AA:B5"; static bd_addr_t remote_addr; static btstack_packet_callback_registration_t hci_event_callback_registration; /* @section Main application configuration * * @text In the application configuration, L2CAP is initialized */ /* LISTING_START(PanuSetup): Panu 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 hid_host_setup(void){ // register for HCI events hci_event_callback_registration.callback = &packet_handler; hci_add_event_handler(&hci_event_callback_registration); // Initialize L2CAP l2cap_init(); } /* LISTING_END */ /* @section SDP parser callback * * @text The SDP parsers retrieves the BNEP PAN UUID as explained in * Section [on SDP BNEP Query example](#sec:sdpbnepqueryExample}. */ 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); des_iterator_t attribute_list_it; des_iterator_t additional_des_it; des_iterator_t prot_it; uint8_t *des_element; uint8_t *element; uint32_t uuid; uint8_t status; switch (hci_event_packet_get_type(packet)){ case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= attribute_value_buffer_size) { 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)) { switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) { case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST: for (des_iterator_init(&attribute_list_it, attribute_value); des_iterator_has_more(&attribute_list_it); des_iterator_next(&attribute_list_it)) { if (des_iterator_get_type(&attribute_list_it) != DE_DES) continue; des_element = des_iterator_get_element(&attribute_list_it); des_iterator_init(&prot_it, des_element); element = des_iterator_get_element(&prot_it); if (de_get_element_type(element) != DE_UUID) continue; 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), &hid_control_psm); printf("HID Control PSM: 0x%04x\n", (int) hid_control_psm); break; default: break; } } break; case BLUETOOTH_ATTRIBUTE_ADDITIONAL_PROTOCOL_DESCRIPTOR_LISTS: for (des_iterator_init(&attribute_list_it, attribute_value); des_iterator_has_more(&attribute_list_it); des_iterator_next(&attribute_list_it)) { if (des_iterator_get_type(&attribute_list_it) != DE_DES) continue; des_element = des_iterator_get_element(&attribute_list_it); for (des_iterator_init(&additional_des_it, des_element); des_iterator_has_more(&additional_des_it); des_iterator_next(&additional_des_it)) { if (des_iterator_get_type(&additional_des_it) != DE_DES) continue; des_element = des_iterator_get_element(&additional_des_it); des_iterator_init(&prot_it, des_element); element = des_iterator_get_element(&prot_it); if (de_get_element_type(element) != DE_UUID) continue; 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), &hid_interrupt_psm); printf("HID Interrupt PSM: 0x%04x\n", (int) hid_interrupt_psm); break; default: break; } } } break; case BLUETOOTH_ATTRIBUTE_HID_DESCRIPTOR_LIST: hid_descriptor_len = sdp_event_query_attribute_byte_get_attribute_length(packet); memcpy(hid_descriptor, attribute_value, hid_descriptor_len); printf("HID Descriptor:\n"); printf_hexdump(hid_descriptor, hid_descriptor_len); break; default: break; } } } else { fprintf(stderr, "SDP attribute value buffer size exceeded: available %d, required %d\n", attribute_value_buffer_size, sdp_event_query_attribute_byte_get_attribute_length(packet)); } break; case SDP_EVENT_QUERY_COMPLETE: if (!hid_control_psm) { printf("HID Control PSM missing\n"); break; } if (!hid_interrupt_psm) { printf("HID Interrupt PSM missing\n"); break; } printf("Setup HID\n"); status = l2cap_create_channel(packet_handler, remote_addr, hid_control_psm, 48, &l2cap_hid_control_cid); if (status){ printf("Connecting to HID Control failed: 0x%02x\n", status); } break; } } /* * @section Packet Handler * * @text The packet handler responds to various HCI Events. */ /* LISTING_START(packetHandler): Packet Handler */ static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) { /* LISTING_PAUSE */ uint8_t event; bd_addr_t event_addr; uint8_t status; uint16_t l2cap_cid; /* LISTING_RESUME */ switch (packet_type) { case HCI_EVENT_PACKET: event = hci_event_packet_get_type(packet); switch (event) { /* @text When BTSTACK_EVENT_STATE with state HCI_STATE_WORKING * is received and the example is started in client mode, the remote SDP HID query is started. */ case BTSTACK_EVENT_STATE: if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){ printf("Start SDP HID query for remote HID Device.\n"); sdp_client_query_uuid16(&handle_sdp_client_query_result, remote_addr, BLUETOOTH_SERVICE_CLASS_HUMAN_INTERFACE_DEVICE_SERVICE); } break; /* LISTING_PAUSE */ case HCI_EVENT_PIN_CODE_REQUEST: // inform about pin code request printf("Pin code request - using '0000'\n"); hci_event_pin_code_request_get_bd_addr(packet, event_addr); gap_pin_code_response(event_addr, "0000"); break; case HCI_EVENT_USER_CONFIRMATION_REQUEST: // inform about user confirmation request printf("SSP User Confirmation Request with numeric value '%06u'\n", little_endian_read_32(packet, 8)); printf("SSP User Confirmation Auto accept\n"); break; /* LISTING_RESUME */ case L2CAP_EVENT_CHANNEL_OPENED: status = packet[2]; if (status){ printf("L2CAP Connection failed: 0x%02x\n", status); break; } l2cap_cid = little_endian_read_16(packet, 13); if (!l2cap_cid) break; if (l2cap_cid == l2cap_hid_control_cid){ status = l2cap_create_channel(packet_handler, remote_addr, hid_interrupt_psm, 48, &l2cap_hid_interrupt_cid); if (status){ printf("Connecting to HID Control failed: 0x%02x\n", status); break; } } if (l2cap_cid == l2cap_hid_interrupt_cid){ printf("HID Connection established\n"); } break; default: break; } break; case L2CAP_DATA_PACKET: // for now, just dump incoming data if (channel == l2cap_hid_interrupt_cid){ printf("HID Interrupt: "); } else if (channel == l2cap_hid_control_cid){ printf("HID Control: "); } else { break; } printf_hexdump(packet, size); default: break; } } /* LISTING_END */ int btstack_main(int argc, const char * argv[]); int btstack_main(int argc, const char * argv[]){ (void)argc; (void)argv; hid_host_setup(); // parse human readable Bluetooth address sscanf_bd_addr(remote_addr_string, remote_addr); // Turn on the device hci_power_control(HCI_POWER_ON); return 0; } /* EXAMPLE_END */