An example of creating and updating a simple GATT Service using the BLE_API
Dependencies: BLE_API mbed nRF51822 X_NUCLEO_IDB0XA1
This example creates and updates a standard Battery Level service, and a single GATT characteristic that contains the battery level.
main.cpp
- Committer:
- Vincent Coubard
- Date:
- 2016-09-20
- Revision:
- 19:1e34f137b7ce
- Parent:
- 17:5afb0e5a48fc
File content as of revision 19:1e34f137b7ce:
/* mbed Microcontroller Library * Copyright (c) 2006-2014 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "mbed.h" #include "BLE.h" #include "BatteryService.h" DigitalOut led1(LED1, 1); Ticker t; BatteryService *batteryService = NULL; uint8_t batteryLevel = 50; void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *disconnectionParams) { printf("Disconnected handle %u!\n\r", disconnectionParams->handle); printf("Restarting the advertising process\n\r"); BLE::Instance(BLE::DEFAULT_INSTANCE).gap().startAdvertising(); // restart advertising } void blink(void) { led1 = !led1; } void bleInitComplete(BLE::InitializationCompleteCallbackContext *params) { BLE &ble = params->ble; ble_error_t error = params->error; Gap& gap = ble.gap(); if (error != BLE_ERROR_NONE) { return; } gap.onDisconnection(disconnectionCallback); batteryService = new BatteryService(ble, batteryLevel); /* setup advertising */ gap.accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE); gap.setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED); gap.setAdvertisingInterval(1000); /* 1000ms; in multiples of 0.625ms. */ gap.startAdvertising(); } int main(void) { t.attach(blink, 1.0f); printf("Initialising the nRF51822\n\r"); BLE& ble = BLE::Instance(BLE::DEFAULT_INSTANCE); ble.init(bleInitComplete); /* SpinWait for initialization to complete. This is necessary because the * BLE object is used in the main loop below. */ while (ble.hasInitialized() == false) { /* spin loop */ } while (true) { ble.waitForEvent(); // this will return upon any system event (such as an interrupt or a ticker wakeup) // the magic battery processing batteryLevel++; if (batteryLevel > 100) { batteryLevel = 20; } batteryService->updateBatteryLevel(batteryLevel); } }