|
| 1 | +/* mbed Microcontroller Library |
| 2 | + * Copyright (c) 2017 ARM Limited |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + */ |
| 16 | + |
| 17 | +#ifndef GATT_SERVER_EXAMPLE_BLE_PROCESS_H_ |
| 18 | +#define GATT_SERVER_EXAMPLE_BLE_PROCESS_H_ |
| 19 | + |
| 20 | +#include <stdint.h> |
| 21 | +#include <stdio.h> |
| 22 | + |
| 23 | +#include "events/Eventqueue.h" |
| 24 | +#include "platform/Callback.h" |
| 25 | +#include "platform/NonCopyable.h" |
| 26 | + |
| 27 | +#include "ble/BLE.h" |
| 28 | +#include "ble/Gap.h" |
| 29 | +#include "ble/GapAdvertisingParams.h" |
| 30 | +#include "ble/GapAdvertisingData.h" |
| 31 | +#include "ble/FunctionPointerWithContext.h" |
| 32 | + |
| 33 | +/** |
| 34 | + * Handle initialization adn shutdown of the BLE Instance. |
| 35 | + * |
| 36 | + * Setup advertising payload and manage advertising state. |
| 37 | + * Delegate to GattClientProcess once the connection is established. |
| 38 | + */ |
| 39 | +class BLEProcess : private mbed::NonCopyable<BLEProcess> { |
| 40 | +public: |
| 41 | + /** |
| 42 | + * Construct a BLEProcess from an event queue and a ble interface. |
| 43 | + * |
| 44 | + * Call start() to initiate ble processing. |
| 45 | + */ |
| 46 | + BLEProcess(events::EventQueue &event_queue, BLE &ble_interface) : |
| 47 | + _event_queue(event_queue), |
| 48 | + _ble_interface(ble_interface), |
| 49 | + _post_init_cb() { |
| 50 | + } |
| 51 | + |
| 52 | + ~BLEProcess() |
| 53 | + { |
| 54 | + stop(); |
| 55 | + } |
| 56 | + |
| 57 | + /** |
| 58 | + * Subscription to the ble interface initialization event. |
| 59 | + * |
| 60 | + * @param[in] cb The callback object that will be called when the ble |
| 61 | + * interface is initialized. |
| 62 | + */ |
| 63 | + void on_init(mbed::Callback<void(BLE&, events::EventQueue&)> cb) |
| 64 | + { |
| 65 | + _post_init_cb = cb; |
| 66 | + } |
| 67 | + |
| 68 | + /** |
| 69 | + * Initialize the ble interface, configure it and start advertising. |
| 70 | + */ |
| 71 | + bool start() |
| 72 | + { |
| 73 | + printf("Ble process started.\r\n"); |
| 74 | + |
| 75 | + if (_ble_interface.hasInitialized()) { |
| 76 | + printf("Error: the ble instance has already been initialized.\r\n"); |
| 77 | + return false; |
| 78 | + } |
| 79 | + |
| 80 | + _ble_interface.onEventsToProcess( |
| 81 | + makeFunctionPointer(this, &BLEProcess::schedule_ble_events) |
| 82 | + ); |
| 83 | + |
| 84 | + ble_error_t error = _ble_interface.init( |
| 85 | + this, &BLEProcess::when_init_complete |
| 86 | + ); |
| 87 | + |
| 88 | + if (error) { |
| 89 | + printf("Error: %u returned by BLE::init.\r\n", error); |
| 90 | + return false; |
| 91 | + } |
| 92 | + |
| 93 | + return true; |
| 94 | + } |
| 95 | + |
| 96 | + /** |
| 97 | + * Close existing connections and stop the process. |
| 98 | + */ |
| 99 | + void stop() |
| 100 | + { |
| 101 | + if (_ble_interface.hasInitialized()) { |
| 102 | + _ble_interface.shutdown(); |
| 103 | + printf("Ble process stopped."); |
| 104 | + } |
| 105 | + } |
| 106 | + |
| 107 | +private: |
| 108 | + |
| 109 | + /** |
| 110 | + * Schedule processing of events from the BLE middleware in the event queue. |
| 111 | + */ |
| 112 | + void schedule_ble_events(BLE::OnEventsToProcessCallbackContext *event) |
| 113 | + { |
| 114 | + _event_queue.call(mbed::callback(&event->ble, &BLE::processEvents)); |
| 115 | + } |
| 116 | + |
| 117 | + /** |
| 118 | + * Sets up adverting payload and start advertising. |
| 119 | + * |
| 120 | + * This function is invoked when the ble interface is initialized. |
| 121 | + */ |
| 122 | + void when_init_complete(BLE::InitializationCompleteCallbackContext *event) |
| 123 | + { |
| 124 | + if (event->error) { |
| 125 | + printf("Error %u during the initialization\r\n", event->error); |
| 126 | + return; |
| 127 | + } |
| 128 | + printf("Ble instance initialized\r\n"); |
| 129 | + |
| 130 | + Gap &gap = _ble_interface.gap(); |
| 131 | + ble_error_t error = gap.setAdvertisingPayload(make_advertising_data()); |
| 132 | + if (error) { |
| 133 | + printf("Error %u during gap.setAdvertisingPayload\r\n", error); |
| 134 | + return; |
| 135 | + } |
| 136 | + |
| 137 | + gap.setAdvertisingParams(make_advertising_params()); |
| 138 | + |
| 139 | + gap.onConnection(this, &BLEProcess::when_connection); |
| 140 | + gap.onDisconnection(this, &BLEProcess::when_disconnection); |
| 141 | + |
| 142 | + start_advertising(); |
| 143 | + |
| 144 | + if (_post_init_cb) { |
| 145 | + _post_init_cb(_ble_interface, _event_queue); |
| 146 | + } |
| 147 | + } |
| 148 | + |
| 149 | + void when_connection(const Gap::ConnectionCallbackParams_t *connection_event) |
| 150 | + { |
| 151 | + printf("Connected.\r\n"); |
| 152 | + } |
| 153 | + |
| 154 | + void when_disconnection(const Gap::DisconnectionCallbackParams_t *event) |
| 155 | + { |
| 156 | + printf("Disconnected.\r\n"); |
| 157 | + start_advertising(); |
| 158 | + } |
| 159 | + |
| 160 | + void start_advertising(void) |
| 161 | + { |
| 162 | + ble_error_t error = _ble_interface.gap().startAdvertising(); |
| 163 | + if (error) { |
| 164 | + printf("Error %u during gap.startAdvertising.\r\n", error); |
| 165 | + return; |
| 166 | + } else { |
| 167 | + printf("Advertising started.\r\n"); |
| 168 | + } |
| 169 | + } |
| 170 | + |
| 171 | + static GapAdvertisingData make_advertising_data(void) |
| 172 | + { |
| 173 | + static const uint8_t device_name[] = "GattServer"; |
| 174 | + GapAdvertisingData advertising_data; |
| 175 | + |
| 176 | + // add advertising flags |
| 177 | + advertising_data.addFlags( |
| 178 | + GapAdvertisingData::LE_GENERAL_DISCOVERABLE | |
| 179 | + GapAdvertisingData::BREDR_NOT_SUPPORTED |
| 180 | + ); |
| 181 | + |
| 182 | + // add device name |
| 183 | + advertising_data.addData( |
| 184 | + GapAdvertisingData::COMPLETE_LOCAL_NAME, |
| 185 | + device_name, |
| 186 | + sizeof(device_name) |
| 187 | + ); |
| 188 | + |
| 189 | + return advertising_data; |
| 190 | + } |
| 191 | + |
| 192 | + static GapAdvertisingParams make_advertising_params(void) |
| 193 | + { |
| 194 | + return GapAdvertisingParams( |
| 195 | + /* type */ GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED, |
| 196 | + /* interval */ GapAdvertisingParams::MSEC_TO_ADVERTISEMENT_DURATION_UNITS(500), |
| 197 | + /* timeout */ 0 |
| 198 | + ); |
| 199 | + } |
| 200 | + |
| 201 | + events::EventQueue &_event_queue; |
| 202 | + BLE &_ble_interface; |
| 203 | + mbed::Callback<void(BLE&, events::EventQueue&)> _post_init_cb; |
| 204 | +}; |
| 205 | + |
| 206 | +#endif /* GATT_SERVER_EXAMPLE_BLE_PROCESS_H_ */ |
0 commit comments