IoT Empire
Experimental BLE Blinky Application using a LED and button service server. This is a small custom service that is used to toggle LEDs and receive button status from wirelessly connected Bluetooth Smart development boards.
For information on the GATT service UUID, characteristic UUIDs, or what to expect when manipulating them, please refer to:
http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v13.0.0%2Fble_sdk_app_blinky.html http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v11.0.0%2Fgroup__ble__sdk__srv__lbs.html http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v11.0.0%2Fgroup__ble__sdk__srv__lbs__c.html
Good luck with that.
For an easy 5 minute tour of how Bluetooth Smart works, program a developer kit (nRF52-DK for example) with this application. Once it starts to run it will indicate advertising by blinking LED1. At this time, install a corresponding client application like the nRF Blinky Android app [1] and watch it detect the developer kit. Click on the 'Lightsw' identifier to connect with the GATT service and wait until the developer kit LED1 stops blinking to indicate a connected state. Now, illuminate LED2 by clicking on the lightbulb. Pressing one of the developer kit's buttons will cause the Android app's background to illuminate illustrating bidirectional communication over Bluetooth Smart.
[1] https://play.google.com/store/apps/details?id=no.nordicsemi.android.nrfblinky
Diff: source/Service.h
- Revision:
- 2:204381095967
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/source/Service.h Tue Mar 28 15:57:46 2017 +0000
@@ -0,0 +1,63 @@
+/* Blinky service application
+ *
+ * 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.
+ */
+
+#ifndef __BLE_BUTLED_SERVICE_H__
+#define __BLE_BUTLED_SERVICE_H__
+
+class Blinkyserv {
+public:
+ // These are stale UUIDs, not corresponding to Nordic
+ //const static uint16_t LED_SERVICE_UUID = 0xA002;
+ //const static uint16_t LED_STATE_CHARACTERISTIC_UUID = 0xA004;
+ //const static uint16_t BUT_STATE_CHARACTERISTIC_UUID = 0xA005;
+
+ // https://github.com/NordicSemiconductor/Android-nRF-Blinky/tree/master/app/src/main/java/no/nordicsemi/android/blinky/service/BlinkyManager.java
+ // BaseUUID = {0x23, 0xd1, 0xbc, 0xea, 0x5f, 0x78, 0x23, 0x15, 0xde, 0xef, 0x12, 0x12, 0x23, 0x15, 0x00, 0x00};
+ //const static UUID *LED_SERVICE_UUID = new UUID("00001523-1212-efde-1523-785feabcd123");
+ //std::shared_ptr<UUID> LED_SERVICE_UUID;
+ const UUID *LED_SERVICE_UUID;
+
+ Blinkyserv(BLEDevice &_ble, bool initialValueForLEDCharacteristic, bool initialValueForButCharacteristic) :
+ ble(_ble), ledState(UUID("00001525-1212-efde-1523-785feabcd123"), &initialValueForLEDCharacteristic),
+ butState(UUID("00001524-1212-efde-1523-785feabcd123"), &initialValueForButCharacteristic, GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY)
+ {
+ // Service definition logic
+ GattCharacteristic *charTable[] = {&ledState, &butState};
+ LED_SERVICE_UUID = new UUID("00001523-1212-efde-1523-785feabcd123");
+
+ GattService GATTServ(static_cast<UUID>(*LED_SERVICE_UUID), charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
+ ble.addService(GATTServ);
+ }
+
+ // FIXME: Does this need a butState equivalent?
+ GattAttribute::Handle_t getValueHandle() const {
+ return ledState.getValueHandle();
+ }
+
+ void updateButtonState(bool newState) { // Sets button state characteristic appropriately
+ //ble.gattServer().write(butState.getValueHandle(), (uint8_t *)&newState, sizeof(bool));
+ ble.updateCharacteristicValue(butState.getValueHandle(), (uint8_t *)&newState, sizeof(bool));
+ }
+
+private:
+ BLEDevice &ble;
+ ReadWriteGattCharacteristic<bool> ledState;
+ ReadOnlyGattCharacteristic<bool> butState;
+ ~Blinkyserv() {
+ delete LED_SERVICE_UUID;
+ }
+};
+
+#endif /* #ifndef __BLE_BUTLED_SERVICE_H__ */
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