mbed-os-examples
/
mbed-os-example-ble-GattClient
This application demonstrates detailed uses of the GattClient APIs.
source/main.cpp@4:38639a71a0f1, 2019-02-27 (annotated)
- Committer:
- mbed_official
- Date:
- Wed Feb 27 13:01:37 2019 +0000
- Revision:
- 4:38639a71a0f1
- Parent:
- 2:32be19c07874
- Child:
- 5:331ef6ec71f5
Updating mbed-os to mbed-os-5.11.5
.
Commit copied from https://github.com/ARMmbed/mbed-os-example-ble
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mbed_official | 2:32be19c07874 | 1 | |
mbed_official | 2:32be19c07874 | 2 | /* mbed Microcontroller Library |
mbed_official | 2:32be19c07874 | 3 | * Copyright (c) 2006-2018 ARM Limited |
mbed_official | 2:32be19c07874 | 4 | * |
mbed_official | 2:32be19c07874 | 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
mbed_official | 2:32be19c07874 | 6 | * you may not use this file except in compliance with the License. |
mbed_official | 2:32be19c07874 | 7 | * You may obtain a copy of the License at |
mbed_official | 2:32be19c07874 | 8 | * |
mbed_official | 2:32be19c07874 | 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
mbed_official | 2:32be19c07874 | 10 | * |
mbed_official | 2:32be19c07874 | 11 | * Unless required by applicable law or agreed to in writing, software |
mbed_official | 2:32be19c07874 | 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
mbed_official | 2:32be19c07874 | 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
mbed_official | 2:32be19c07874 | 14 | * See the License for the specific language governing permissions and |
mbed_official | 2:32be19c07874 | 15 | * limitations under the License. |
mbed_official | 2:32be19c07874 | 16 | */ |
mbed_official | 2:32be19c07874 | 17 | |
mbed_official | 2:32be19c07874 | 18 | #include <memory> |
mbed_official | 2:32be19c07874 | 19 | #include <new> |
mbed_official | 2:32be19c07874 | 20 | #include <stdio.h> |
mbed_official | 2:32be19c07874 | 21 | |
mbed_official | 2:32be19c07874 | 22 | #include "events/EventQueue.h" |
mbed_official | 2:32be19c07874 | 23 | #include "platform/NonCopyable.h" |
mbed_official | 2:32be19c07874 | 24 | |
mbed_official | 2:32be19c07874 | 25 | #include "ble/BLE.h" |
mbed_official | 2:32be19c07874 | 26 | #include "ble/Gap.h" |
mbed_official | 2:32be19c07874 | 27 | #include "ble/GattClient.h" |
mbed_official | 2:32be19c07874 | 28 | #include "ble/GapAdvertisingParams.h" |
mbed_official | 2:32be19c07874 | 29 | #include "ble/GapAdvertisingData.h" |
mbed_official | 2:32be19c07874 | 30 | #include "ble/GattClient.h" |
mbed_official | 2:32be19c07874 | 31 | #include "ble/DiscoveredService.h" |
mbed_official | 2:32be19c07874 | 32 | #include "ble/DiscoveredCharacteristic.h" |
mbed_official | 2:32be19c07874 | 33 | #include "ble/CharacteristicDescriptorDiscovery.h" |
mbed_official | 2:32be19c07874 | 34 | |
mbed_official | 2:32be19c07874 | 35 | #include "BLEProcess.h" |
mbed_official | 2:32be19c07874 | 36 | |
mbed_official | 2:32be19c07874 | 37 | /** |
mbed_official | 2:32be19c07874 | 38 | * Handle discovery of the GATT server. |
mbed_official | 2:32be19c07874 | 39 | * |
mbed_official | 2:32be19c07874 | 40 | * First the GATT server is discovered in its entirety then each readable |
mbed_official | 2:32be19c07874 | 41 | * characteristic is read and the client register to characteristic |
mbed_official | 2:32be19c07874 | 42 | * notifications or indication when available. The client report server |
mbed_official | 2:32be19c07874 | 43 | * indications and notification until the connection end. |
mbed_official | 2:32be19c07874 | 44 | */ |
mbed_official | 2:32be19c07874 | 45 | class GattClientProcess : private mbed::NonCopyable<GattClientProcess>, |
mbed_official | 2:32be19c07874 | 46 | public ble::Gap::EventHandler { |
mbed_official | 2:32be19c07874 | 47 | |
mbed_official | 2:32be19c07874 | 48 | // Internal typedef to this class type. |
mbed_official | 2:32be19c07874 | 49 | // It is used as a shorthand to pass member function as callbacks. |
mbed_official | 2:32be19c07874 | 50 | typedef GattClientProcess Self; |
mbed_official | 2:32be19c07874 | 51 | |
mbed_official | 2:32be19c07874 | 52 | typedef CharacteristicDescriptorDiscovery::DiscoveryCallbackParams_t |
mbed_official | 2:32be19c07874 | 53 | DiscoveryCallbackParams_t; |
mbed_official | 2:32be19c07874 | 54 | |
mbed_official | 2:32be19c07874 | 55 | typedef CharacteristicDescriptorDiscovery::TerminationCallbackParams_t |
mbed_official | 2:32be19c07874 | 56 | TerminationCallbackParams_t; |
mbed_official | 2:32be19c07874 | 57 | |
mbed_official | 2:32be19c07874 | 58 | typedef DiscoveredCharacteristic::Properties_t Properties_t; |
mbed_official | 2:32be19c07874 | 59 | |
mbed_official | 2:32be19c07874 | 60 | public: |
mbed_official | 2:32be19c07874 | 61 | |
mbed_official | 2:32be19c07874 | 62 | /** |
mbed_official | 2:32be19c07874 | 63 | * Construct an empty client process. |
mbed_official | 2:32be19c07874 | 64 | * |
mbed_official | 2:32be19c07874 | 65 | * The function start() shall be called to initiate the discovery process. |
mbed_official | 2:32be19c07874 | 66 | */ |
mbed_official | 2:32be19c07874 | 67 | GattClientProcess() : |
mbed_official | 2:32be19c07874 | 68 | _client(NULL), |
mbed_official | 2:32be19c07874 | 69 | _connection_handle(), |
mbed_official | 2:32be19c07874 | 70 | _characteristics(NULL), |
mbed_official | 2:32be19c07874 | 71 | _it(NULL), |
mbed_official | 2:32be19c07874 | 72 | _descriptor_handle(0), |
mbed_official | 2:32be19c07874 | 73 | _ble_interface(NULL), |
mbed_official | 2:32be19c07874 | 74 | _event_queue(NULL) { |
mbed_official | 2:32be19c07874 | 75 | } |
mbed_official | 2:32be19c07874 | 76 | |
mbed_official | 2:32be19c07874 | 77 | ~GattClientProcess() |
mbed_official | 2:32be19c07874 | 78 | { |
mbed_official | 2:32be19c07874 | 79 | stop(); |
mbed_official | 2:32be19c07874 | 80 | } |
mbed_official | 2:32be19c07874 | 81 | |
mbed_official | 2:32be19c07874 | 82 | void init(BLE &ble_interface, events::EventQueue &event_queue) |
mbed_official | 2:32be19c07874 | 83 | { |
mbed_official | 2:32be19c07874 | 84 | _ble_interface = &ble_interface; |
mbed_official | 2:32be19c07874 | 85 | _event_queue = &event_queue; |
mbed_official | 2:32be19c07874 | 86 | _client = &_ble_interface->gattClient(); |
mbed_official | 2:32be19c07874 | 87 | |
mbed_official | 2:32be19c07874 | 88 | _ble_interface->gap().setEventHandler(this); |
mbed_official | 2:32be19c07874 | 89 | } |
mbed_official | 2:32be19c07874 | 90 | |
mbed_official | 2:32be19c07874 | 91 | /** |
mbed_official | 2:32be19c07874 | 92 | * Start the discovery process. |
mbed_official | 2:32be19c07874 | 93 | * |
mbed_official | 2:32be19c07874 | 94 | * @param[in] client The GattClient instance which will discover the distant |
mbed_official | 2:32be19c07874 | 95 | * GATT server. |
mbed_official | 2:32be19c07874 | 96 | * @param[in] connection_handle Reference of the connection to the GATT |
mbed_official | 2:32be19c07874 | 97 | * server which will be discovered. |
mbed_official | 2:32be19c07874 | 98 | */ |
mbed_official | 2:32be19c07874 | 99 | void start() |
mbed_official | 2:32be19c07874 | 100 | { |
mbed_official | 2:32be19c07874 | 101 | // setup the event handlers called during the process |
mbed_official | 2:32be19c07874 | 102 | _client->onDataWritten().add(as_cb(&Self::when_descriptor_written)); |
mbed_official | 2:32be19c07874 | 103 | _client->onHVX().add(as_cb(&Self::when_characteristic_changed)); |
mbed_official | 2:32be19c07874 | 104 | |
mbed_official | 2:32be19c07874 | 105 | // The discovery process will invoke when_service_discovered when a |
mbed_official | 2:32be19c07874 | 106 | // service is discovered, when_characteristic_discovered when a |
mbed_official | 2:32be19c07874 | 107 | // characteristic is discovered and when_service_discovery_ends once the |
mbed_official | 2:32be19c07874 | 108 | // discovery process has ended. |
mbed_official | 2:32be19c07874 | 109 | _client->onServiceDiscoveryTermination(as_cb(&Self::when_service_discovery_ends)); |
mbed_official | 2:32be19c07874 | 110 | ble_error_t error = _client->launchServiceDiscovery( |
mbed_official | 2:32be19c07874 | 111 | _connection_handle, |
mbed_official | 2:32be19c07874 | 112 | as_cb(&Self::when_service_discovered), |
mbed_official | 2:32be19c07874 | 113 | as_cb(&Self::when_characteristic_discovered) |
mbed_official | 2:32be19c07874 | 114 | ); |
mbed_official | 2:32be19c07874 | 115 | |
mbed_official | 2:32be19c07874 | 116 | if (error) { |
mbed_official | 2:32be19c07874 | 117 | printf("Error %u returned by _client->launchServiceDiscovery.\r\n", error); |
mbed_official | 2:32be19c07874 | 118 | return; |
mbed_official | 2:32be19c07874 | 119 | } |
mbed_official | 2:32be19c07874 | 120 | |
mbed_official | 2:32be19c07874 | 121 | printf("Client process started: initiate service discovery.\r\n"); |
mbed_official | 2:32be19c07874 | 122 | } |
mbed_official | 2:32be19c07874 | 123 | |
mbed_official | 2:32be19c07874 | 124 | /** |
mbed_official | 2:32be19c07874 | 125 | * Stop the discovery process and clean the instance. |
mbed_official | 2:32be19c07874 | 126 | */ |
mbed_official | 2:32be19c07874 | 127 | void stop() |
mbed_official | 2:32be19c07874 | 128 | { |
mbed_official | 2:32be19c07874 | 129 | if (!_client) { |
mbed_official | 2:32be19c07874 | 130 | return; |
mbed_official | 2:32be19c07874 | 131 | } |
mbed_official | 2:32be19c07874 | 132 | |
mbed_official | 2:32be19c07874 | 133 | // unregister event handlers |
mbed_official | 2:32be19c07874 | 134 | _client->onDataWritten().detach(as_cb(&Self::when_descriptor_written)); |
mbed_official | 2:32be19c07874 | 135 | _client->onHVX().detach(as_cb(&Self::when_characteristic_changed)); |
mbed_official | 2:32be19c07874 | 136 | _client->onServiceDiscoveryTermination(NULL); |
mbed_official | 2:32be19c07874 | 137 | |
mbed_official | 2:32be19c07874 | 138 | // remove discovered characteristics |
mbed_official | 2:32be19c07874 | 139 | clear_characteristics(); |
mbed_official | 2:32be19c07874 | 140 | |
mbed_official | 2:32be19c07874 | 141 | // clean up the instance |
mbed_official | 2:32be19c07874 | 142 | _connection_handle = 0; |
mbed_official | 2:32be19c07874 | 143 | _characteristics = NULL; |
mbed_official | 2:32be19c07874 | 144 | _it = NULL; |
mbed_official | 2:32be19c07874 | 145 | _descriptor_handle = 0; |
mbed_official | 2:32be19c07874 | 146 | |
mbed_official | 2:32be19c07874 | 147 | printf("Client process stopped.\r\n"); |
mbed_official | 2:32be19c07874 | 148 | } |
mbed_official | 2:32be19c07874 | 149 | |
mbed_official | 2:32be19c07874 | 150 | private: |
mbed_official | 2:32be19c07874 | 151 | /** |
mbed_official | 2:32be19c07874 | 152 | * Event handler invoked when a connection is established. |
mbed_official | 2:32be19c07874 | 153 | * |
mbed_official | 2:32be19c07874 | 154 | * This function setup the connection handle to operate on then start the |
mbed_official | 2:32be19c07874 | 155 | * discovery process. |
mbed_official | 2:32be19c07874 | 156 | */ |
mbed_official | 2:32be19c07874 | 157 | virtual void onConnectionComplete(const ble::ConnectionCompleteEvent &event) |
mbed_official | 2:32be19c07874 | 158 | { |
mbed_official | 2:32be19c07874 | 159 | _connection_handle = event.getConnectionHandle(); |
mbed_official | 2:32be19c07874 | 160 | _event_queue->call(mbed::callback(this, &Self::start)); |
mbed_official | 2:32be19c07874 | 161 | } |
mbed_official | 2:32be19c07874 | 162 | |
mbed_official | 2:32be19c07874 | 163 | /** |
mbed_official | 2:32be19c07874 | 164 | * Stop the discovery process and clean the instance. |
mbed_official | 2:32be19c07874 | 165 | */ |
mbed_official | 2:32be19c07874 | 166 | virtual void onDisconnectionComplete(const ble::DisconnectionCompleteEvent &event) |
mbed_official | 2:32be19c07874 | 167 | { |
mbed_official | 2:32be19c07874 | 168 | if (_client && event.getConnectionHandle() == _connection_handle) { |
mbed_official | 2:32be19c07874 | 169 | stop(); |
mbed_official | 2:32be19c07874 | 170 | } |
mbed_official | 2:32be19c07874 | 171 | } |
mbed_official | 2:32be19c07874 | 172 | |
mbed_official | 2:32be19c07874 | 173 | private: |
mbed_official | 2:32be19c07874 | 174 | //////////////////////////////////////////////////////////////////////////////// |
mbed_official | 2:32be19c07874 | 175 | // Service and characteristic discovery process. |
mbed_official | 2:32be19c07874 | 176 | |
mbed_official | 2:32be19c07874 | 177 | /** |
mbed_official | 2:32be19c07874 | 178 | * Handle services discovered. |
mbed_official | 2:32be19c07874 | 179 | * |
mbed_official | 2:32be19c07874 | 180 | * The GattClient invokes this function when a service has been discovered. |
mbed_official | 2:32be19c07874 | 181 | * |
mbed_official | 2:32be19c07874 | 182 | * @see GattClient::launchServiceDiscovery |
mbed_official | 2:32be19c07874 | 183 | */ |
mbed_official | 2:32be19c07874 | 184 | void when_service_discovered(const DiscoveredService *discovered_service) |
mbed_official | 2:32be19c07874 | 185 | { |
mbed_official | 2:32be19c07874 | 186 | // print information of the service discovered |
mbed_official | 2:32be19c07874 | 187 | printf("Service discovered: value = "); |
mbed_official | 2:32be19c07874 | 188 | print_uuid(discovered_service->getUUID()); |
mbed_official | 2:32be19c07874 | 189 | printf(", start = %u, end = %u.\r\n", |
mbed_official | 2:32be19c07874 | 190 | discovered_service->getStartHandle(), |
mbed_official | 2:32be19c07874 | 191 | discovered_service->getEndHandle() |
mbed_official | 2:32be19c07874 | 192 | ); |
mbed_official | 2:32be19c07874 | 193 | } |
mbed_official | 2:32be19c07874 | 194 | |
mbed_official | 2:32be19c07874 | 195 | /** |
mbed_official | 2:32be19c07874 | 196 | * Handle characteristics discovered. |
mbed_official | 2:32be19c07874 | 197 | * |
mbed_official | 2:32be19c07874 | 198 | * The GattClient invoke this function when a characteristic has been |
mbed_official | 2:32be19c07874 | 199 | * discovered. |
mbed_official | 2:32be19c07874 | 200 | * |
mbed_official | 2:32be19c07874 | 201 | * @see GattClient::launchServiceDiscovery |
mbed_official | 2:32be19c07874 | 202 | */ |
mbed_official | 2:32be19c07874 | 203 | void when_characteristic_discovered(const DiscoveredCharacteristic *discovered_characteristic) |
mbed_official | 2:32be19c07874 | 204 | { |
mbed_official | 2:32be19c07874 | 205 | // print characteristics properties |
mbed_official | 2:32be19c07874 | 206 | printf("\tCharacteristic discovered: uuid = "); |
mbed_official | 2:32be19c07874 | 207 | print_uuid(discovered_characteristic->getUUID()); |
mbed_official | 2:32be19c07874 | 208 | printf(", properties = "); |
mbed_official | 2:32be19c07874 | 209 | print_properties(discovered_characteristic->getProperties()); |
mbed_official | 2:32be19c07874 | 210 | printf( |
mbed_official | 2:32be19c07874 | 211 | ", decl handle = %u, value handle = %u, last handle = %u.\r\n", |
mbed_official | 2:32be19c07874 | 212 | discovered_characteristic->getDeclHandle(), |
mbed_official | 2:32be19c07874 | 213 | discovered_characteristic->getValueHandle(), |
mbed_official | 2:32be19c07874 | 214 | discovered_characteristic->getLastHandle() |
mbed_official | 2:32be19c07874 | 215 | ); |
mbed_official | 2:32be19c07874 | 216 | |
mbed_official | 2:32be19c07874 | 217 | // add the characteristic into the list of discovered characteristics |
mbed_official | 2:32be19c07874 | 218 | bool success = add_characteristic(discovered_characteristic); |
mbed_official | 2:32be19c07874 | 219 | if (!success) { |
mbed_official | 2:32be19c07874 | 220 | printf("Error: memory allocation failure while adding the discovered characteristic.\r\n"); |
mbed_official | 2:32be19c07874 | 221 | _client->terminateServiceDiscovery(); |
mbed_official | 2:32be19c07874 | 222 | stop(); |
mbed_official | 2:32be19c07874 | 223 | return; |
mbed_official | 2:32be19c07874 | 224 | } |
mbed_official | 2:32be19c07874 | 225 | } |
mbed_official | 2:32be19c07874 | 226 | |
mbed_official | 2:32be19c07874 | 227 | /** |
mbed_official | 2:32be19c07874 | 228 | * Handle termination of the service and characteristic discovery process. |
mbed_official | 2:32be19c07874 | 229 | * |
mbed_official | 2:32be19c07874 | 230 | * The GattClient invokes this function when the service and characteristic |
mbed_official | 2:32be19c07874 | 231 | * discovery process ends. |
mbed_official | 2:32be19c07874 | 232 | * |
mbed_official | 2:32be19c07874 | 233 | * @see GattClient::onServiceDiscoveryTermination |
mbed_official | 2:32be19c07874 | 234 | */ |
mbed_official | 2:32be19c07874 | 235 | void when_service_discovery_ends(Gap::Handle_t connection_handle) |
mbed_official | 2:32be19c07874 | 236 | { |
mbed_official | 2:32be19c07874 | 237 | if (!_characteristics) { |
mbed_official | 2:32be19c07874 | 238 | printf("No characteristics discovered, end of the process.\r\n"); |
mbed_official | 2:32be19c07874 | 239 | return; |
mbed_official | 2:32be19c07874 | 240 | } |
mbed_official | 2:32be19c07874 | 241 | |
mbed_official | 2:32be19c07874 | 242 | printf("All services and characteristics discovered, process them.\r\n"); |
mbed_official | 2:32be19c07874 | 243 | |
mbed_official | 2:32be19c07874 | 244 | // reset iterator and start processing characteristics in order |
mbed_official | 2:32be19c07874 | 245 | _it = NULL; |
mbed_official | 2:32be19c07874 | 246 | _event_queue->call(mbed::callback(this, &Self::process_next_characteristic)); |
mbed_official | 2:32be19c07874 | 247 | } |
mbed_official | 2:32be19c07874 | 248 | |
mbed_official | 2:32be19c07874 | 249 | //////////////////////////////////////////////////////////////////////////////// |
mbed_official | 2:32be19c07874 | 250 | // Processing of characteristics based on their properties. |
mbed_official | 2:32be19c07874 | 251 | |
mbed_official | 2:32be19c07874 | 252 | /** |
mbed_official | 2:32be19c07874 | 253 | * Process the characteristics discovered. |
mbed_official | 2:32be19c07874 | 254 | * |
mbed_official | 2:32be19c07874 | 255 | * - If the characteristic is readable then read its value and print it. Then |
mbed_official | 2:32be19c07874 | 256 | * - If the characteristic can emit notification or indication then discover |
mbed_official | 2:32be19c07874 | 257 | * the characteristic CCCD and subscribe to the server initiated event. |
mbed_official | 2:32be19c07874 | 258 | * - Otherwise skip the characteristic processing. |
mbed_official | 2:32be19c07874 | 259 | */ |
mbed_official | 2:32be19c07874 | 260 | void process_next_characteristic(void) |
mbed_official | 2:32be19c07874 | 261 | { |
mbed_official | 2:32be19c07874 | 262 | if (!_it) { |
mbed_official | 2:32be19c07874 | 263 | _it = _characteristics; |
mbed_official | 2:32be19c07874 | 264 | } else { |
mbed_official | 2:32be19c07874 | 265 | _it = _it->next; |
mbed_official | 2:32be19c07874 | 266 | } |
mbed_official | 2:32be19c07874 | 267 | |
mbed_official | 2:32be19c07874 | 268 | while (_it) { |
mbed_official | 2:32be19c07874 | 269 | Properties_t properties = _it->value.getProperties(); |
mbed_official | 2:32be19c07874 | 270 | |
mbed_official | 2:32be19c07874 | 271 | if (properties.read()) { |
mbed_official | 2:32be19c07874 | 272 | read_characteristic(_it->value); |
mbed_official | 2:32be19c07874 | 273 | return; |
mbed_official | 2:32be19c07874 | 274 | } else if(properties.notify() || properties.indicate()) { |
mbed_official | 2:32be19c07874 | 275 | discover_descriptors(_it->value); |
mbed_official | 2:32be19c07874 | 276 | return; |
mbed_official | 2:32be19c07874 | 277 | } else { |
mbed_official | 2:32be19c07874 | 278 | printf( |
mbed_official | 2:32be19c07874 | 279 | "Skip processing of characteristic %u\r\n", |
mbed_official | 2:32be19c07874 | 280 | _it->value.getValueHandle() |
mbed_official | 2:32be19c07874 | 281 | ); |
mbed_official | 2:32be19c07874 | 282 | _it = _it->next; |
mbed_official | 2:32be19c07874 | 283 | } |
mbed_official | 2:32be19c07874 | 284 | } |
mbed_official | 2:32be19c07874 | 285 | |
mbed_official | 2:32be19c07874 | 286 | printf("All characteristics discovered have been processed.\r\n"); |
mbed_official | 2:32be19c07874 | 287 | } |
mbed_official | 2:32be19c07874 | 288 | |
mbed_official | 2:32be19c07874 | 289 | /** |
mbed_official | 2:32be19c07874 | 290 | * Initate the read of the characteristic in input. |
mbed_official | 2:32be19c07874 | 291 | * |
mbed_official | 2:32be19c07874 | 292 | * The completion of the operation will happens in when_characteristic_read() |
mbed_official | 2:32be19c07874 | 293 | */ |
mbed_official | 2:32be19c07874 | 294 | void read_characteristic(const DiscoveredCharacteristic &characteristic) |
mbed_official | 2:32be19c07874 | 295 | { |
mbed_official | 2:32be19c07874 | 296 | printf("Initiating read at %u.\r\n", characteristic.getValueHandle()); |
mbed_official | 2:32be19c07874 | 297 | ble_error_t error = characteristic.read( |
mbed_official | 2:32be19c07874 | 298 | 0, as_cb(&Self::when_characteristic_read) |
mbed_official | 2:32be19c07874 | 299 | ); |
mbed_official | 2:32be19c07874 | 300 | |
mbed_official | 2:32be19c07874 | 301 | if (error) { |
mbed_official | 2:32be19c07874 | 302 | printf( |
mbed_official | 2:32be19c07874 | 303 | "Error: cannot initiate read at %u due to %u\r\n", |
mbed_official | 2:32be19c07874 | 304 | characteristic.getValueHandle(), error |
mbed_official | 2:32be19c07874 | 305 | ); |
mbed_official | 2:32be19c07874 | 306 | stop(); |
mbed_official | 2:32be19c07874 | 307 | } |
mbed_official | 2:32be19c07874 | 308 | } |
mbed_official | 2:32be19c07874 | 309 | |
mbed_official | 2:32be19c07874 | 310 | /** |
mbed_official | 2:32be19c07874 | 311 | * Handle the reception of a read response. |
mbed_official | 2:32be19c07874 | 312 | * |
mbed_official | 2:32be19c07874 | 313 | * If the characteristic can emit notification or indication then start the |
mbed_official | 2:32be19c07874 | 314 | * discovery of the the characteristic descriptors then subscribe to the |
mbed_official | 2:32be19c07874 | 315 | * server initiated event by writing the CCCD discovered. Otherwise start |
mbed_official | 2:32be19c07874 | 316 | * the processing of the next characteristic discovered in the server. |
mbed_official | 2:32be19c07874 | 317 | */ |
mbed_official | 2:32be19c07874 | 318 | void when_characteristic_read(const GattReadCallbackParams *read_event) |
mbed_official | 2:32be19c07874 | 319 | { |
mbed_official | 2:32be19c07874 | 320 | printf("\tCharacteristic value at %u equal to: ", read_event->handle); |
mbed_official | 2:32be19c07874 | 321 | for (size_t i = 0; i < read_event->len; ++i) { |
mbed_official | 2:32be19c07874 | 322 | printf("0x%02X ", read_event->data[i]); |
mbed_official | 2:32be19c07874 | 323 | } |
mbed_official | 2:32be19c07874 | 324 | printf(".\r\n"); |
mbed_official | 2:32be19c07874 | 325 | |
mbed_official | 2:32be19c07874 | 326 | Properties_t properties = _it->value.getProperties(); |
mbed_official | 2:32be19c07874 | 327 | |
mbed_official | 2:32be19c07874 | 328 | if(properties.notify() || properties.indicate()) { |
mbed_official | 2:32be19c07874 | 329 | discover_descriptors(_it->value); |
mbed_official | 2:32be19c07874 | 330 | } else { |
mbed_official | 2:32be19c07874 | 331 | process_next_characteristic(); |
mbed_official | 2:32be19c07874 | 332 | } |
mbed_official | 2:32be19c07874 | 333 | } |
mbed_official | 2:32be19c07874 | 334 | |
mbed_official | 2:32be19c07874 | 335 | /** |
mbed_official | 2:32be19c07874 | 336 | * Initiate the discovery of the descriptors of the characteristic in input. |
mbed_official | 2:32be19c07874 | 337 | * |
mbed_official | 2:32be19c07874 | 338 | * When a descriptor is discovered, the function when_descriptor_discovered |
mbed_official | 2:32be19c07874 | 339 | * is invoked. |
mbed_official | 2:32be19c07874 | 340 | */ |
mbed_official | 2:32be19c07874 | 341 | void discover_descriptors(const DiscoveredCharacteristic &characteristic) |
mbed_official | 2:32be19c07874 | 342 | { |
mbed_official | 2:32be19c07874 | 343 | printf("Initiating descriptor discovery of %u.\r\n", characteristic.getValueHandle()); |
mbed_official | 2:32be19c07874 | 344 | |
mbed_official | 2:32be19c07874 | 345 | _descriptor_handle = 0; |
mbed_official | 2:32be19c07874 | 346 | ble_error_t error = characteristic.discoverDescriptors( |
mbed_official | 2:32be19c07874 | 347 | as_cb(&Self::when_descriptor_discovered), |
mbed_official | 2:32be19c07874 | 348 | as_cb(&Self::when_descriptor_discovery_ends) |
mbed_official | 2:32be19c07874 | 349 | ); |
mbed_official | 2:32be19c07874 | 350 | |
mbed_official | 2:32be19c07874 | 351 | if (error) { |
mbed_official | 2:32be19c07874 | 352 | printf( |
mbed_official | 2:32be19c07874 | 353 | "Error: cannot initiate discovery of %04X due to %u.\r\n", |
mbed_official | 2:32be19c07874 | 354 | characteristic.getValueHandle(), error |
mbed_official | 2:32be19c07874 | 355 | ); |
mbed_official | 2:32be19c07874 | 356 | stop(); |
mbed_official | 2:32be19c07874 | 357 | } |
mbed_official | 2:32be19c07874 | 358 | } |
mbed_official | 2:32be19c07874 | 359 | |
mbed_official | 2:32be19c07874 | 360 | /** |
mbed_official | 2:32be19c07874 | 361 | * Handle the discovery of the characteristic descriptors. |
mbed_official | 2:32be19c07874 | 362 | * |
mbed_official | 2:32be19c07874 | 363 | * If the descriptor found is a CCCD then stop the discovery. Once the |
mbed_official | 2:32be19c07874 | 364 | * process has ended subscribe to server initiated events by writing the |
mbed_official | 2:32be19c07874 | 365 | * value of the CCCD. |
mbed_official | 2:32be19c07874 | 366 | */ |
mbed_official | 2:32be19c07874 | 367 | void when_descriptor_discovered(const DiscoveryCallbackParams_t* event) |
mbed_official | 2:32be19c07874 | 368 | { |
mbed_official | 2:32be19c07874 | 369 | printf("\tDescriptor discovered at %u, UUID: ", event->descriptor.getAttributeHandle()); |
mbed_official | 2:32be19c07874 | 370 | print_uuid(event->descriptor.getUUID()); |
mbed_official | 2:32be19c07874 | 371 | printf(".\r\n"); |
mbed_official | 2:32be19c07874 | 372 | |
mbed_official | 2:32be19c07874 | 373 | if (event->descriptor.getUUID() == BLE_UUID_DESCRIPTOR_CLIENT_CHAR_CONFIG) { |
mbed_official | 2:32be19c07874 | 374 | _descriptor_handle = event->descriptor.getAttributeHandle(); |
mbed_official | 2:32be19c07874 | 375 | _client->terminateCharacteristicDescriptorDiscovery( |
mbed_official | 2:32be19c07874 | 376 | event->characteristic |
mbed_official | 2:32be19c07874 | 377 | ); |
mbed_official | 2:32be19c07874 | 378 | } |
mbed_official | 2:32be19c07874 | 379 | } |
mbed_official | 2:32be19c07874 | 380 | |
mbed_official | 2:32be19c07874 | 381 | /** |
mbed_official | 2:32be19c07874 | 382 | * If a CCCD has been found subscribe to server initiated events by writing |
mbed_official | 2:32be19c07874 | 383 | * its value. |
mbed_official | 2:32be19c07874 | 384 | */ |
mbed_official | 2:32be19c07874 | 385 | void when_descriptor_discovery_ends(const TerminationCallbackParams_t *event) { |
mbed_official | 2:32be19c07874 | 386 | // shall never happen but happen with android devices ... |
mbed_official | 2:32be19c07874 | 387 | // process the next charateristic |
mbed_official | 2:32be19c07874 | 388 | if (!_descriptor_handle) { |
mbed_official | 2:32be19c07874 | 389 | printf("\tWarning: characteristic with notify or indicate attribute without CCCD.\r\n"); |
mbed_official | 2:32be19c07874 | 390 | process_next_characteristic(); |
mbed_official | 2:32be19c07874 | 391 | return; |
mbed_official | 2:32be19c07874 | 392 | } |
mbed_official | 2:32be19c07874 | 393 | |
mbed_official | 2:32be19c07874 | 394 | Properties_t properties = _it->value.getProperties(); |
mbed_official | 2:32be19c07874 | 395 | |
mbed_official | 2:32be19c07874 | 396 | uint16_t cccd_value = |
mbed_official | 2:32be19c07874 | 397 | (properties.notify() << 0) | (properties.indicate() << 1); |
mbed_official | 2:32be19c07874 | 398 | |
mbed_official | 2:32be19c07874 | 399 | ble_error_t error = _client->write( |
mbed_official | 2:32be19c07874 | 400 | GattClient::GATT_OP_WRITE_REQ, |
mbed_official | 2:32be19c07874 | 401 | _connection_handle, |
mbed_official | 2:32be19c07874 | 402 | _descriptor_handle, |
mbed_official | 2:32be19c07874 | 403 | sizeof(cccd_value), |
mbed_official | 2:32be19c07874 | 404 | reinterpret_cast<uint8_t*>(&cccd_value) |
mbed_official | 2:32be19c07874 | 405 | ); |
mbed_official | 2:32be19c07874 | 406 | |
mbed_official | 2:32be19c07874 | 407 | if (error) { |
mbed_official | 2:32be19c07874 | 408 | printf( |
mbed_official | 2:32be19c07874 | 409 | "Error: cannot initiate write of CCCD %u due to %u.\r\n", |
mbed_official | 2:32be19c07874 | 410 | _descriptor_handle, error |
mbed_official | 2:32be19c07874 | 411 | ); |
mbed_official | 2:32be19c07874 | 412 | stop(); |
mbed_official | 2:32be19c07874 | 413 | } |
mbed_official | 2:32be19c07874 | 414 | } |
mbed_official | 2:32be19c07874 | 415 | |
mbed_official | 2:32be19c07874 | 416 | /** |
mbed_official | 2:32be19c07874 | 417 | * Called when the CCCD has been written. |
mbed_official | 2:32be19c07874 | 418 | */ |
mbed_official | 2:32be19c07874 | 419 | void when_descriptor_written(const GattWriteCallbackParams* event) |
mbed_official | 2:32be19c07874 | 420 | { |
mbed_official | 2:32be19c07874 | 421 | // should never happen |
mbed_official | 2:32be19c07874 | 422 | if (!_descriptor_handle) { |
mbed_official | 2:32be19c07874 | 423 | printf("\tError: received write response to unsolicited request.\r\n"); |
mbed_official | 2:32be19c07874 | 424 | stop(); |
mbed_official | 2:32be19c07874 | 425 | return; |
mbed_official | 2:32be19c07874 | 426 | } |
mbed_official | 2:32be19c07874 | 427 | |
mbed_official | 2:32be19c07874 | 428 | printf("\tCCCD at %u written.\r\n", _descriptor_handle); |
mbed_official | 2:32be19c07874 | 429 | _descriptor_handle = 0; |
mbed_official | 2:32be19c07874 | 430 | process_next_characteristic(); |
mbed_official | 2:32be19c07874 | 431 | } |
mbed_official | 2:32be19c07874 | 432 | |
mbed_official | 2:32be19c07874 | 433 | /** |
mbed_official | 2:32be19c07874 | 434 | * Print the updated value of the characteristic. |
mbed_official | 2:32be19c07874 | 435 | * |
mbed_official | 2:32be19c07874 | 436 | * This function is called when the server emits a notification or an |
mbed_official | 2:32be19c07874 | 437 | * indication of a characteristic value the client has subscribed to. |
mbed_official | 2:32be19c07874 | 438 | * |
mbed_official | 2:32be19c07874 | 439 | * @see GattClient::onHVX() |
mbed_official | 2:32be19c07874 | 440 | */ |
mbed_official | 2:32be19c07874 | 441 | void when_characteristic_changed(const GattHVXCallbackParams* event) |
mbed_official | 2:32be19c07874 | 442 | { |
mbed_official | 2:32be19c07874 | 443 | printf("Change on attribute %u: new value = ", event->handle); |
mbed_official | 2:32be19c07874 | 444 | for (size_t i = 0; i < event->len; ++i) { |
mbed_official | 2:32be19c07874 | 445 | printf("0x%02X ", event->data[i]); |
mbed_official | 2:32be19c07874 | 446 | } |
mbed_official | 2:32be19c07874 | 447 | printf(".\r\n"); |
mbed_official | 2:32be19c07874 | 448 | } |
mbed_official | 2:32be19c07874 | 449 | |
mbed_official | 2:32be19c07874 | 450 | struct DiscoveredCharacteristicNode { |
mbed_official | 2:32be19c07874 | 451 | DiscoveredCharacteristicNode(const DiscoveredCharacteristic &c) : |
mbed_official | 2:32be19c07874 | 452 | value(c), next(NULL) { } |
mbed_official | 2:32be19c07874 | 453 | |
mbed_official | 2:32be19c07874 | 454 | DiscoveredCharacteristic value; |
mbed_official | 2:32be19c07874 | 455 | DiscoveredCharacteristicNode *next; |
mbed_official | 2:32be19c07874 | 456 | }; |
mbed_official | 2:32be19c07874 | 457 | |
mbed_official | 2:32be19c07874 | 458 | /** |
mbed_official | 2:32be19c07874 | 459 | * Add a discovered characteristic into the list of discovered characteristics. |
mbed_official | 2:32be19c07874 | 460 | */ |
mbed_official | 2:32be19c07874 | 461 | bool add_characteristic(const DiscoveredCharacteristic *characteristic) |
mbed_official | 2:32be19c07874 | 462 | { |
mbed_official | 2:32be19c07874 | 463 | DiscoveredCharacteristicNode* new_node = |
mbed_official | 2:32be19c07874 | 464 | new(std::nothrow) DiscoveredCharacteristicNode(*characteristic); |
mbed_official | 2:32be19c07874 | 465 | |
mbed_official | 2:32be19c07874 | 466 | if (new_node == false) { |
mbed_official | 2:32be19c07874 | 467 | printf("Error while allocating a new characteristic.\r\n"); |
mbed_official | 2:32be19c07874 | 468 | return false; |
mbed_official | 2:32be19c07874 | 469 | } |
mbed_official | 2:32be19c07874 | 470 | |
mbed_official | 2:32be19c07874 | 471 | if (_characteristics == NULL) { |
mbed_official | 2:32be19c07874 | 472 | _characteristics = new_node; |
mbed_official | 2:32be19c07874 | 473 | } else { |
mbed_official | 2:32be19c07874 | 474 | DiscoveredCharacteristicNode* c = _characteristics; |
mbed_official | 2:32be19c07874 | 475 | while(c->next) { |
mbed_official | 2:32be19c07874 | 476 | c = c->next; |
mbed_official | 2:32be19c07874 | 477 | } |
mbed_official | 2:32be19c07874 | 478 | c->next = new_node; |
mbed_official | 2:32be19c07874 | 479 | } |
mbed_official | 2:32be19c07874 | 480 | |
mbed_official | 2:32be19c07874 | 481 | return true; |
mbed_official | 2:32be19c07874 | 482 | } |
mbed_official | 2:32be19c07874 | 483 | |
mbed_official | 2:32be19c07874 | 484 | /** |
mbed_official | 2:32be19c07874 | 485 | * Clear the list of discovered characteristics. |
mbed_official | 2:32be19c07874 | 486 | */ |
mbed_official | 2:32be19c07874 | 487 | void clear_characteristics(void) |
mbed_official | 2:32be19c07874 | 488 | { |
mbed_official | 2:32be19c07874 | 489 | DiscoveredCharacteristicNode *c= _characteristics; |
mbed_official | 2:32be19c07874 | 490 | |
mbed_official | 2:32be19c07874 | 491 | while (c) { |
mbed_official | 2:32be19c07874 | 492 | DiscoveredCharacteristicNode *n = c->next; |
mbed_official | 2:32be19c07874 | 493 | delete c; |
mbed_official | 2:32be19c07874 | 494 | c = n; |
mbed_official | 2:32be19c07874 | 495 | } |
mbed_official | 2:32be19c07874 | 496 | } |
mbed_official | 2:32be19c07874 | 497 | |
mbed_official | 2:32be19c07874 | 498 | /** |
mbed_official | 2:32be19c07874 | 499 | * Helper to construct an event handler from a member function of this |
mbed_official | 2:32be19c07874 | 500 | * instance. |
mbed_official | 2:32be19c07874 | 501 | */ |
mbed_official | 2:32be19c07874 | 502 | template<typename ContextType> |
mbed_official | 2:32be19c07874 | 503 | FunctionPointerWithContext<ContextType> as_cb( |
mbed_official | 2:32be19c07874 | 504 | void (Self::*member)(ContextType context) |
mbed_official | 2:32be19c07874 | 505 | ) { |
mbed_official | 2:32be19c07874 | 506 | return makeFunctionPointer(this, member); |
mbed_official | 2:32be19c07874 | 507 | } |
mbed_official | 2:32be19c07874 | 508 | |
mbed_official | 2:32be19c07874 | 509 | /** |
mbed_official | 2:32be19c07874 | 510 | * Print the value of a UUID. |
mbed_official | 2:32be19c07874 | 511 | */ |
mbed_official | 2:32be19c07874 | 512 | static void print_uuid(const UUID &uuid) |
mbed_official | 2:32be19c07874 | 513 | { |
mbed_official | 2:32be19c07874 | 514 | const uint8_t *uuid_value = uuid.getBaseUUID(); |
mbed_official | 2:32be19c07874 | 515 | |
mbed_official | 2:32be19c07874 | 516 | // UUIDs are in little endian, print them in big endian |
mbed_official | 2:32be19c07874 | 517 | for (size_t i = 0; i < uuid.getLen(); ++i) { |
mbed_official | 2:32be19c07874 | 518 | printf("%02X", uuid_value[(uuid.getLen() - 1) - i]); |
mbed_official | 2:32be19c07874 | 519 | } |
mbed_official | 2:32be19c07874 | 520 | } |
mbed_official | 2:32be19c07874 | 521 | |
mbed_official | 2:32be19c07874 | 522 | /** |
mbed_official | 2:32be19c07874 | 523 | * Print the value of a characteristic properties. |
mbed_official | 2:32be19c07874 | 524 | */ |
mbed_official | 2:32be19c07874 | 525 | static void print_properties(const Properties_t &properties) |
mbed_official | 2:32be19c07874 | 526 | { |
mbed_official | 2:32be19c07874 | 527 | const struct { |
mbed_official | 2:32be19c07874 | 528 | bool (Properties_t::*fn)() const; |
mbed_official | 2:32be19c07874 | 529 | const char* str; |
mbed_official | 2:32be19c07874 | 530 | } prop_to_str[] = { |
mbed_official | 2:32be19c07874 | 531 | { &Properties_t::broadcast, "broadcast" }, |
mbed_official | 2:32be19c07874 | 532 | { &Properties_t::read, "read" }, |
mbed_official | 2:32be19c07874 | 533 | { &Properties_t::writeWoResp, "writeWoResp" }, |
mbed_official | 2:32be19c07874 | 534 | { &Properties_t::write, "write" }, |
mbed_official | 2:32be19c07874 | 535 | { &Properties_t::notify, "notify" }, |
mbed_official | 2:32be19c07874 | 536 | { &Properties_t::indicate, "indicate" }, |
mbed_official | 2:32be19c07874 | 537 | { &Properties_t::authSignedWrite, "authSignedWrite" } |
mbed_official | 2:32be19c07874 | 538 | }; |
mbed_official | 2:32be19c07874 | 539 | |
mbed_official | 2:32be19c07874 | 540 | printf("["); |
mbed_official | 2:32be19c07874 | 541 | for (size_t i = 0; i < (sizeof(prop_to_str) / sizeof(prop_to_str[0])); ++i) { |
mbed_official | 2:32be19c07874 | 542 | if ((properties.*(prop_to_str[i].fn))()) { |
mbed_official | 2:32be19c07874 | 543 | printf(" %s", prop_to_str[i].str); |
mbed_official | 2:32be19c07874 | 544 | } |
mbed_official | 2:32be19c07874 | 545 | } |
mbed_official | 2:32be19c07874 | 546 | printf(" ]"); |
mbed_official | 2:32be19c07874 | 547 | } |
mbed_official | 2:32be19c07874 | 548 | |
mbed_official | 2:32be19c07874 | 549 | GattClient *_client; |
mbed_official | 2:32be19c07874 | 550 | Gap::Handle_t _connection_handle; |
mbed_official | 2:32be19c07874 | 551 | DiscoveredCharacteristicNode *_characteristics; |
mbed_official | 2:32be19c07874 | 552 | DiscoveredCharacteristicNode *_it; |
mbed_official | 2:32be19c07874 | 553 | GattAttribute::Handle_t _descriptor_handle; |
mbed_official | 2:32be19c07874 | 554 | BLE *_ble_interface; |
mbed_official | 2:32be19c07874 | 555 | events::EventQueue *_event_queue; |
mbed_official | 2:32be19c07874 | 556 | }; |
mbed_official | 2:32be19c07874 | 557 | |
mbed_official | 2:32be19c07874 | 558 | |
mbed_official | 2:32be19c07874 | 559 | int main() { |
mbed_official | 2:32be19c07874 | 560 | |
mbed_official | 2:32be19c07874 | 561 | BLE &ble_interface = BLE::Instance(); |
mbed_official | 2:32be19c07874 | 562 | events::EventQueue event_queue; |
mbed_official | 2:32be19c07874 | 563 | BLEProcess ble_process(event_queue, ble_interface); |
mbed_official | 2:32be19c07874 | 564 | GattClientProcess gatt_client_process; |
mbed_official | 2:32be19c07874 | 565 | |
mbed_official | 2:32be19c07874 | 566 | // Register GattClientProcess::init in the ble_process; this function will |
mbed_official | 2:32be19c07874 | 567 | // be called once the ble_interface is initialized. |
mbed_official | 2:32be19c07874 | 568 | ble_process.on_init( |
mbed_official | 2:32be19c07874 | 569 | mbed::callback(&gatt_client_process, &GattClientProcess::init) |
mbed_official | 2:32be19c07874 | 570 | ); |
mbed_official | 2:32be19c07874 | 571 | |
mbed_official | 2:32be19c07874 | 572 | // bind the event queue to the ble interface, initialize the interface |
mbed_official | 2:32be19c07874 | 573 | // and start advertising |
mbed_official | 2:32be19c07874 | 574 | ble_process.start(); |
mbed_official | 2:32be19c07874 | 575 | |
mbed_official | 2:32be19c07874 | 576 | // Process the event queue. |
mbed_official | 2:32be19c07874 | 577 | event_queue.dispatch_forever(); |
mbed_official | 2:32be19c07874 | 578 | |
mbed_official | 2:32be19c07874 | 579 | return 0; |
mbed_official | 2:32be19c07874 | 580 | } |