This example demonstrates using the GattClient API to control BLE client devices. The canonical source for this example lives at https://github.com/ARMmbed/mbed-os-example-ble/tree/master/BLE_LEDBlinker
Diff: source/main.cpp
- Revision:
- 81:816977af0b75
- Parent:
- 77:85a0d3cdd896
--- a/source/main.cpp Wed Feb 27 13:02:16 2019 +0000 +++ b/source/main.cpp Thu Mar 07 09:38:15 2019 +0000 @@ -21,9 +21,11 @@ #include "ble/DiscoveredService.h" #include "ble/gap/Gap.h" #include "ble/gap/AdvertisingDataParser.h" +#include "LEDService.h" #include "pretty_printer.h" const static char PEER_NAME[] = "LED"; +const static char DEVICE_NAME[] = "LED"; static EventQueue event_queue(/* event count */ 10 * EVENTS_EVENT_SIZE); @@ -91,7 +93,10 @@ _event_queue(event_queue), _alive_led(LED1, 1), _actuated_led(LED2, 0), - _is_connecting(false) { } + _is_connecting(false), + _led_uuid(LEDService::LED_SERVICE_UUID), + _led_service(NULL), + _adv_data_builder(_adv_buffer) { } ~LEDBlinkerDemo() { } @@ -105,6 +110,50 @@ _event_queue.dispatch_forever(); } + void start_advertising() { + /* Create advertising parameters and payload */ + + ble::AdvertisingParameters adv_parameters( + ble::advertising_type_t::CONNECTABLE_UNDIRECTED, + ble::adv_interval_t(ble::millisecond_t(1000)) + ); + + _adv_data_builder.setFlags(); + _adv_data_builder.setLocalServiceList(mbed::make_Span(&_led_uuid, 1)); + _adv_data_builder.setName(DEVICE_NAME); + + /* Setup advertising */ + + ble_error_t error = _ble.gap().setAdvertisingParameters( + ble::LEGACY_ADVERTISING_HANDLE, + adv_parameters + ); + + if (error) { + printf("_ble.gap().setAdvertisingParameters() failed\r\n"); + return; + } + + error = _ble.gap().setAdvertisingPayload( + ble::LEGACY_ADVERTISING_HANDLE, + _adv_data_builder.getAdvertisingData() + ); + + if (error) { + printf("_ble.gap().setAdvertisingPayload() failed\r\n"); + return; + } + + /* Start advertising */ + + error = _ble.gap().startAdvertising(ble::LEGACY_ADVERTISING_HANDLE); + + if (error) { + printf("_ble.gap().startAdvertising() failed\r\n"); + return; + } + } + private: /** Callback triggered when the ble initialization process has finished */ void on_init_complete(BLE::InitializationCompleteCallbackContext *params) { @@ -118,6 +167,9 @@ _ble.gattClient().onDataRead(trigger_toggled_write); _ble.gattClient().onDataWritten(trigger_read); + _led_service = new LEDService(_ble, false); + _ble.gattServer().onDataWritten(this, &LEDBlinkerDemo::on_data_written); + ble::ScanParameters scan_params; _ble.gap().setScanParameters(scan_params); _ble.gap().startScan(); @@ -136,6 +188,7 @@ } void onConnectionComplete(const ble::ConnectionCompleteEvent& event) { + printf("onConnectionComplete\r\n"); if (event.getOwnRole() == ble::connection_role_t::CENTRAL) { _ble.gattClient().onServiceDiscoveryTermination(discovery_termination); _ble.gattClient().launchServiceDiscovery( @@ -145,6 +198,10 @@ 0xa000, 0xa001 ); + printf("Connected as Central, start advertising\r\n"); + start_advertising(); + } else if (event.getOwnRole() == ble::connection_role_t::PERIPHERAL) { + printf("Connected as Peripheral\r\n"); } else { _ble.gap().startScan(); } @@ -203,14 +260,34 @@ } } + /** + * This callback allows the LEDService to receive updates to the ledState Characteristic. + * + * @param[in] params Information about the characterisitc being updated. + */ + void on_data_written(const GattWriteCallbackParams *params) { + printf("led_service getValueHandle() %x\r\n", _led_service->getValueHandle()); + printf("on_data_written, handle:%x len:%d\r\n", params->handle, params->len); + if ((params->handle == _led_service->getValueHandle()) && (params->len == 1)) { + _actuated_led = *(params->data); + } + } + private: BLE &_ble; events::EventQueue &_event_queue; DigitalOut _alive_led; DigitalOut _actuated_led; bool _is_connecting; + + UUID _led_uuid; + LEDService *_led_service; + + uint8_t _adv_buffer[ble::LEGACY_ADVERTISING_MAX_SIZE]; + ble::AdvertisingDataBuilder _adv_data_builder; }; + /** Schedule processing of events from the BLE middleware in the event queue. */ void schedule_ble_events(BLE::OnEventsToProcessCallbackContext *context) { event_queue.call(Callback<void()>(&context->ble, &BLE::processEvents));