1 /* 2 * Copyright (C) 2017 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 #define __BTSTACK_FILE__ "hid_host_demo.c" 39 40 /* 41 * hid_host_demo.c 42 */ 43 44 /* EXAMPLE_START(hid_host_demo): HID Host Demo 45 * 46 * @text This example implements an HID Host. For now, it connnects to a fixed device, queries the HID SDP 47 * record and opens the HID Control + Interrupt channels 48 */ 49 50 #include <stdio.h> 51 52 #include "btstack_config.h" 53 #include "btstack.h" 54 55 #define MAX_ATTRIBUTE_VALUE_SIZE 300 56 57 // SDP 58 static uint8_t hid_descriptor[MAX_ATTRIBUTE_VALUE_SIZE]; 59 static uint16_t hid_descriptor_len; 60 61 static uint16_t hid_control_psm; 62 static uint16_t hid_interrupt_psm; 63 64 static uint8_t attribute_value[MAX_ATTRIBUTE_VALUE_SIZE]; 65 static const unsigned int attribute_value_buffer_size = MAX_ATTRIBUTE_VALUE_SIZE; 66 67 // L2CAP 68 static uint16_t l2cap_hid_control_cid; 69 static uint16_t l2cap_hid_interrupt_cid; 70 71 // MBP 2016 72 static const char * remote_addr_string = "F4-0F-24-3B-1B-E1"; 73 // iMpulse static const char * remote_addr_string = "64:6E:6C:C1:AA:B5"; 74 75 static bd_addr_t remote_addr; 76 77 static btstack_packet_callback_registration_t hci_event_callback_registration; 78 79 80 /* @section Main application configuration 81 * 82 * @text In the application configuration, L2CAP is initialized 83 */ 84 85 /* LISTING_START(PanuSetup): Panu setup */ 86 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 87 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 88 89 static void hid_host_setup(void){ 90 91 // register for HCI events 92 hci_event_callback_registration.callback = &packet_handler; 93 hci_add_event_handler(&hci_event_callback_registration); 94 95 // Initialize L2CAP 96 l2cap_init(); 97 } 98 /* LISTING_END */ 99 100 /* @section SDP parser callback 101 * 102 * @text The SDP parsers retrieves the BNEP PAN UUID as explained in 103 * Section [on SDP BNEP Query example](#sec:sdpbnepqueryExample}. 104 */ 105 106 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) { 107 108 UNUSED(packet_type); 109 UNUSED(channel); 110 UNUSED(size); 111 112 des_iterator_t attribute_list_it; 113 des_iterator_t additional_des_it; 114 des_iterator_t prot_it; 115 uint8_t *des_element; 116 uint8_t *element; 117 uint32_t uuid; 118 uint8_t status; 119 120 switch (hci_event_packet_get_type(packet)){ 121 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 122 if (sdp_event_query_attribute_byte_get_attribute_length(packet) <= attribute_value_buffer_size) { 123 attribute_value[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 124 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)) { 125 switch(sdp_event_query_attribute_byte_get_attribute_id(packet)) { 126 case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST: 127 for (des_iterator_init(&attribute_list_it, attribute_value); des_iterator_has_more(&attribute_list_it); des_iterator_next(&attribute_list_it)) { 128 if (des_iterator_get_type(&attribute_list_it) != DE_DES) continue; 129 des_element = des_iterator_get_element(&attribute_list_it); 130 des_iterator_init(&prot_it, des_element); 131 element = des_iterator_get_element(&prot_it); 132 if (de_get_element_type(element) != DE_UUID) continue; 133 uuid = de_get_uuid32(element); 134 switch (uuid){ 135 case BLUETOOTH_PROTOCOL_L2CAP: 136 if (!des_iterator_has_more(&prot_it)) continue; 137 des_iterator_next(&prot_it); 138 de_element_get_uint16(des_iterator_get_element(&prot_it), &hid_control_psm); 139 printf("HID Control PSM: 0x%04x\n", (int) hid_control_psm); 140 break; 141 default: 142 break; 143 } 144 } 145 break; 146 case BLUETOOTH_ATTRIBUTE_ADDITIONAL_PROTOCOL_DESCRIPTOR_LISTS: 147 for (des_iterator_init(&attribute_list_it, attribute_value); des_iterator_has_more(&attribute_list_it); des_iterator_next(&attribute_list_it)) { 148 if (des_iterator_get_type(&attribute_list_it) != DE_DES) continue; 149 des_element = des_iterator_get_element(&attribute_list_it); 150 for (des_iterator_init(&additional_des_it, des_element); des_iterator_has_more(&additional_des_it); des_iterator_next(&additional_des_it)) { 151 if (des_iterator_get_type(&additional_des_it) != DE_DES) continue; 152 des_element = des_iterator_get_element(&additional_des_it); 153 des_iterator_init(&prot_it, des_element); 154 element = des_iterator_get_element(&prot_it); 155 if (de_get_element_type(element) != DE_UUID) continue; 156 uuid = de_get_uuid32(element); 157 switch (uuid){ 158 case BLUETOOTH_PROTOCOL_L2CAP: 159 if (!des_iterator_has_more(&prot_it)) continue; 160 des_iterator_next(&prot_it); 161 de_element_get_uint16(des_iterator_get_element(&prot_it), &hid_interrupt_psm); 162 printf("HID Interrupt PSM: 0x%04x\n", (int) hid_interrupt_psm); 163 break; 164 default: 165 break; 166 } 167 } 168 } 169 break; 170 case BLUETOOTH_ATTRIBUTE_HID_DESCRIPTOR_LIST: 171 hid_descriptor_len = sdp_event_query_attribute_byte_get_attribute_length(packet); 172 memcpy(hid_descriptor, attribute_value, hid_descriptor_len); 173 printf("HID Descriptor:\n"); 174 printf_hexdump(hid_descriptor, hid_descriptor_len); 175 break; 176 default: 177 break; 178 } 179 } 180 } else { 181 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)); 182 } 183 break; 184 185 case SDP_EVENT_QUERY_COMPLETE: 186 if (!hid_control_psm) { 187 printf("HID Control PSM missing\n"); 188 break; 189 } 190 if (!hid_interrupt_psm) { 191 printf("HID Interrupt PSM missing\n"); 192 break; 193 } 194 printf("Setup HID\n"); 195 status = l2cap_create_channel(packet_handler, remote_addr, hid_control_psm, 48, &l2cap_hid_control_cid); 196 if (status){ 197 printf("Connecting to HID Control failed: 0x%02x\n", status); 198 } 199 break; 200 } 201 } 202 203 /* 204 * @section Packet Handler 205 * 206 * @text The packet handler responds to various HCI Events. 207 */ 208 209 /* LISTING_START(packetHandler): Packet Handler */ 210 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) 211 { 212 /* LISTING_PAUSE */ 213 uint8_t event; 214 bd_addr_t event_addr; 215 uint8_t status; 216 uint16_t l2cap_cid; 217 218 /* LISTING_RESUME */ 219 switch (packet_type) { 220 case HCI_EVENT_PACKET: 221 event = hci_event_packet_get_type(packet); 222 switch (event) { 223 /* @text When BTSTACK_EVENT_STATE with state HCI_STATE_WORKING 224 * is received and the example is started in client mode, the remote SDP HID query is started. 225 */ 226 case BTSTACK_EVENT_STATE: 227 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){ 228 printf("Start SDP HID query for remote HID Device.\n"); 229 sdp_client_query_uuid16(&handle_sdp_client_query_result, remote_addr, BLUETOOTH_SERVICE_CLASS_HUMAN_INTERFACE_DEVICE_SERVICE); 230 } 231 break; 232 233 /* LISTING_PAUSE */ 234 case HCI_EVENT_PIN_CODE_REQUEST: 235 // inform about pin code request 236 printf("Pin code request - using '0000'\n"); 237 hci_event_pin_code_request_get_bd_addr(packet, event_addr); 238 gap_pin_code_response(event_addr, "0000"); 239 break; 240 241 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 242 // inform about user confirmation request 243 printf("SSP User Confirmation Request with numeric value '%06u'\n", little_endian_read_32(packet, 8)); 244 printf("SSP User Confirmation Auto accept\n"); 245 break; 246 247 /* LISTING_RESUME */ 248 249 case L2CAP_EVENT_CHANNEL_OPENED: 250 status = packet[2]; 251 if (status){ 252 printf("L2CAP Connection failed: 0x%02x\n", status); 253 break; 254 } 255 l2cap_cid = little_endian_read_16(packet, 13); 256 if (!l2cap_cid) break; 257 if (l2cap_cid == l2cap_hid_control_cid){ 258 status = l2cap_create_channel(packet_handler, remote_addr, hid_interrupt_psm, 48, &l2cap_hid_interrupt_cid); 259 if (status){ 260 printf("Connecting to HID Control failed: 0x%02x\n", status); 261 break; 262 } 263 } 264 if (l2cap_cid == l2cap_hid_interrupt_cid){ 265 printf("HID Connection established\n"); 266 } 267 break; 268 default: 269 break; 270 } 271 break; 272 case L2CAP_DATA_PACKET: 273 // for now, just dump incoming data 274 if (channel == l2cap_hid_interrupt_cid){ 275 printf("HID Interrupt: "); 276 } else if (channel == l2cap_hid_control_cid){ 277 printf("HID Control: "); 278 } else { 279 break; 280 } 281 printf_hexdump(packet, size); 282 default: 283 break; 284 } 285 } 286 /* LISTING_END */ 287 288 int btstack_main(int argc, const char * argv[]); 289 int btstack_main(int argc, const char * argv[]){ 290 291 (void)argc; 292 (void)argv; 293 294 hid_host_setup(); 295 296 // parse human readable Bluetooth address 297 sscanf_bd_addr(remote_addr_string, remote_addr); 298 299 // Turn on the device 300 hci_power_control(HCI_POWER_ON); 301 return 0; 302 } 303 304 /* EXAMPLE_END */ 305