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 #define BTSTACK_FILE__ "heart_rate_service_server.c" 39 40 41 #include "bluetooth.h" 42 #include "btstack_defines.h" 43 #include "ble/att_db.h" 44 #include "ble/att_server.h" 45 #include "btstack_util.h" 46 #include "bluetooth_gatt.h" 47 #include "btstack_debug.h" 48 #include "l2cap.h" 49 50 #include "ble/gatt-service/heart_rate_service_server.h" 51 52 #define HEART_RATE_RESET_ENERGY_EXPENDED 0x01 53 #define HEART_RATE_CONTROL_POINT_NOT_SUPPORTED 0x80 54 55 typedef enum { 56 HEART_RATE_SERVICE_VALUE_FORMAT = 0, 57 HEART_RATE_SERVICE_SENSOR_CONTACT_STATUS, 58 HEART_RATE_SERVICE_ENERGY_EXPENDED_STATUS = 3, 59 HEART_RATE_SERVICE_RR_INTERVAL 60 } heart_rate_service_flag_bit_t; 61 62 typedef struct { 63 hci_con_handle_t con_handle; 64 65 // characteristic: Heart Rate Mesurement 66 uint16_t measurement_value_handle; 67 uint16_t measurement_bpm; 68 uint8_t energy_expended_supported; 69 uint16_t energy_expended_kJ; // kilo Joules 70 int rr_interval_count; 71 int rr_offset; 72 uint16_t * rr_intervals; 73 heart_rate_service_sensor_contact_status_t sensor_contact; 74 75 // characteristic descriptor: Client Characteristic Configuration 76 uint16_t measurement_client_configuration_descriptor_handle; 77 uint16_t measurement_client_configuration_descriptor_notify; 78 btstack_context_callback_registration_t measurement_callback; 79 80 // characteristic: Body Sensor Location 81 uint16_t sensor_location_value_handle; 82 heart_rate_service_body_sensor_location_t sensor_location; 83 84 // characteristic: Heart Rate Control Point 85 uint16_t control_point_value_handle; 86 } heart_rate_t; 87 88 static att_service_handler_t heart_rate_service; 89 static heart_rate_t heart_rate; 90 91 static uint16_t heart_rate_service_read_callback(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size){ 92 UNUSED(con_handle); 93 UNUSED(attribute_handle); 94 UNUSED(offset); 95 UNUSED(buffer_size); 96 97 if (attribute_handle == heart_rate.measurement_client_configuration_descriptor_handle){ 98 if (buffer && (buffer_size >= 2)){ 99 little_endian_store_16(buffer, 0, heart_rate.measurement_client_configuration_descriptor_notify); 100 } 101 return 2; 102 } 103 104 if (attribute_handle == heart_rate.sensor_location_value_handle){ 105 if (buffer && (buffer_size >= 1)){ 106 buffer[0] = heart_rate.sensor_location; 107 } 108 return 1; 109 } 110 return 0; 111 } 112 113 static int heart_rate_service_write_callback(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t transaction_mode, uint16_t offset, uint8_t *buffer, uint16_t buffer_size){ 114 UNUSED(transaction_mode); 115 UNUSED(offset); 116 UNUSED(buffer_size); 117 118 if (attribute_handle == heart_rate.measurement_client_configuration_descriptor_handle){ 119 if (buffer_size < 2){ 120 return ATT_ERROR_INVALID_OFFSET; 121 } 122 heart_rate.measurement_client_configuration_descriptor_notify = little_endian_read_16(buffer, 0); 123 heart_rate.con_handle = con_handle; 124 return 0; 125 } 126 127 if (attribute_handle == heart_rate.control_point_value_handle){ 128 uint16_t cmd = little_endian_read_16(buffer, 0); 129 switch (cmd){ 130 case HEART_RATE_RESET_ENERGY_EXPENDED: 131 heart_rate.energy_expended_kJ = 0; 132 heart_rate.con_handle = con_handle; 133 break; 134 default: 135 return HEART_RATE_CONTROL_POINT_NOT_SUPPORTED; 136 } 137 return 0; 138 } 139 return 0; 140 } 141 142 143 void heart_rate_service_server_init(heart_rate_service_body_sensor_location_t location, int energy_expended_supported){ 144 heart_rate_t * instance = &heart_rate; 145 146 instance->sensor_location = location; 147 instance->energy_expended_supported = energy_expended_supported; 148 149 // get service handle range 150 uint16_t start_handle = 0; 151 uint16_t end_handle = 0xffff; 152 int service_found = gatt_server_get_get_handle_range_for_service_with_uuid16(ORG_BLUETOOTH_SERVICE_HEART_RATE, &start_handle, &end_handle); 153 if (!service_found) return; 154 155 // get Heart Rate Mesurement characteristic value handle and client configuration handle 156 instance->measurement_value_handle = gatt_server_get_value_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_HEART_RATE_MEASUREMENT); 157 instance->measurement_client_configuration_descriptor_handle = gatt_server_get_client_configuration_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_HEART_RATE_MEASUREMENT); 158 // get Body Sensor Location characteristic value handle and client configuration handle 159 instance->sensor_location_value_handle = gatt_server_get_value_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_BODY_SENSOR_LOCATION); 160 // get Hear Rate Control Point characteristic value handle and client configuration handle 161 instance->control_point_value_handle = gatt_server_get_value_handle_for_characteristic_with_uuid16(start_handle, end_handle, ORG_BLUETOOTH_CHARACTERISTIC_HEART_RATE_CONTROL_POINT); 162 163 log_info("Measurement value handle 0x%02x", instance->measurement_value_handle); 164 log_info("Client Config value handle 0x%02x", instance->measurement_client_configuration_descriptor_handle); 165 log_info("Sensor location value handle 0x%02x", instance->sensor_location_value_handle); 166 log_info("Control Point value handle 0x%02x", instance->control_point_value_handle); 167 // register service with ATT Server 168 heart_rate_service.start_handle = start_handle; 169 heart_rate_service.end_handle = end_handle; 170 heart_rate_service.read_callback = &heart_rate_service_read_callback; 171 heart_rate_service.write_callback = &heart_rate_service_write_callback; 172 173 att_server_register_service_handler(&heart_rate_service); 174 } 175 176 177 static void heart_rate_service_can_send_now(void * context){ 178 heart_rate_t * instance = (heart_rate_t *) context; 179 uint8_t flags = (1 << HEART_RATE_SERVICE_VALUE_FORMAT); 180 flags |= (instance->sensor_contact << HEART_RATE_SERVICE_SENSOR_CONTACT_STATUS); 181 if (instance->energy_expended_supported){ 182 flags |= (1 << HEART_RATE_SERVICE_ENERGY_EXPENDED_STATUS); 183 } 184 if (instance->rr_interval_count){ 185 flags |= (1 << HEART_RATE_SERVICE_RR_INTERVAL); 186 } 187 188 uint8_t value[100]; 189 int pos = 0; 190 191 value[pos++] = flags; 192 little_endian_store_16(value, pos, instance->measurement_bpm); 193 pos += 2; 194 if (instance->energy_expended_supported){ 195 little_endian_store_16(value, pos, instance->energy_expended_kJ); 196 pos += 2; 197 } 198 199 // TODO: get actual MTU from ATT server 200 uint16_t bytes_left = btstack_min(sizeof(value), l2cap_max_mtu() - 3 - pos); 201 202 while ((bytes_left > 2) && instance->rr_interval_count){ 203 little_endian_store_16(value, pos, instance->rr_intervals[0]); 204 pos +=2; 205 bytes_left -= 2; 206 instance->rr_intervals++; 207 instance->rr_interval_count--; 208 } 209 210 att_server_notify(instance->con_handle, instance->measurement_value_handle, &value[0], pos); 211 212 if (instance->rr_interval_count){ 213 instance->measurement_callback.callback = &heart_rate_service_can_send_now; 214 instance->measurement_callback.context = (void*) instance; 215 att_server_register_can_send_now_callback(&instance->measurement_callback, instance->con_handle); 216 } 217 } 218 219 void heart_rate_service_add_energy_expended(uint16_t energy_expended_kJ){ 220 heart_rate_t * instance = &heart_rate; 221 // limit energy expended to 0xffff 222 if (instance->energy_expended_kJ <= (0xffff - energy_expended_kJ)){ 223 instance->energy_expended_kJ += energy_expended_kJ; 224 } else { 225 instance->energy_expended_kJ = 0xffff; 226 } 227 } 228 229 void heart_rate_service_server_update_heart_rate_values(uint16_t heart_rate_bpm, 230 heart_rate_service_sensor_contact_status_t sensor_contact, int rr_interval_count, uint16_t * rr_intervals){ 231 heart_rate_t * instance = &heart_rate; 232 233 instance->measurement_bpm = heart_rate_bpm; 234 instance->sensor_contact = sensor_contact; 235 instance->rr_interval_count = rr_interval_count; 236 instance->rr_intervals = rr_intervals; 237 instance->rr_offset = 0; 238 239 if (instance->measurement_client_configuration_descriptor_notify){ 240 instance->measurement_callback.callback = &heart_rate_service_can_send_now; 241 instance->measurement_callback.context = (void*) instance; 242 att_server_register_can_send_now_callback(&instance->measurement_callback, instance->con_handle); 243 } 244 }