characteristics

问题 I'm experiencing an android application on Android Studio. I'm actually able to enable and receive notifications or characteristics reads without problem. Where I'm a bit stuck it's when I read characteristics (by button) if notifications are enable. In my application the data from characteristics reading is right on a case and the notification's data on an other case. But when I read characteristics when notifications are enable, sometimes data exchange their places. I tried to put a global

问题 I am using Android 5.0.1 Lollipop and developing Bluetooth Low Energy server-client communication. I have Samsung Galaxy s4. I have three characteristic in my Custom Service. I made one of the characteristic's property as write-only and encrypted write. Then I changed it to non-encrypted write. The write operation didnt work for this characteristic anymore. I knew I have to restart Bluetooth adapter from settings and unpair the device but it doesn't work anymore at all. Then I changed the

问题 I want to receive notifications when this characteristic is changed Micro:Bit. What I'm doing is basically the following: 1) Check if the system is compatible with BLE 2) Enable bluetooth in case it's disabled 3) Connect to the only one paired device (Micro:Bit) 4) Activate this code when connectivity changes (¿Connected/Disconnected?) 5) Activate this code when characteristic is updated ¿? public class MainActivity extends Activity { BluetoothAdapter bleAdapter; @Override protected void

问题 I´m developing an BLE app, based on the Gatt sample project provided by google: https://developer.android.com/samples/BluetoothLeGatt/index.html. So, I can send data writing in a characteristic successfully. Now I need to know when this characteristic change its value. DeviceActivity private void displayGattServices(List<BluetoothGattService> gattServices) { // get services & characteristics ................ final BluetoothGattCharacteristic characteristic = mGattCharacteristics.get(2).get(0)

问题 I'm a new android developer and I'm trying to send a data using BLE 4.3 , based on Gatt android sample project. I use characteristics to put the data that i want to transmit. When I try to transmit, I use the third service in the list of DeviceControlActivity of the project, appears a text dialog to introduce text. When I press OK, the idea is that start the transmission, but I obtain a NullPointerException error. I don't know why appears this error and how can I solve this. This is my full

问题 I'm trying to send a characteristic in a BLE android to another device. Seaching in internet I found some code that help me to do this, but I cant transmit successfully the data. This is my code, based on Gatt android sample project: public class DeviceControlActivity extends Activity { public static final String EXTRAS_DEVICE_NAME = "DEVICE_NAME"; public static final String EXTRAS_DEVICE_ADDRESS = "DEVICE_ADDRESS"; private TextView mConnectionState; private TextView mDataField; private

问题 I am developing an Android app which should subscribe to multiple BLE characteristics. But whatever I do, I receive only the updated values from one characteristic. Here is the code: BluetoothGattCharacteristic characteristicVel = gatt.getService(BleDefinedUUIDs.Service.KOMMMODUL_SERVICE).getCharacteristic(BleDefinedUUIDs.Characteristic.VELOCITY); gatt.setCharacteristicNotification(characteristicVel, true); BluetoothGattDescriptor descriptorVel = characteristicVel.getDescriptor(

问题 In Samsung 4.2 to 4.3 BLE App Migration Guide (http://developer.samsung.com/ble) it says: The synchronous nature of the stack and F/W hasn’t been affected. That is, if we call for example, writeCharacteristic for a particular characteristic, if it returns true, the next call to any BluetoothGatt or BluetoothGattServer method should be done after the onCharacteristicRead callback is received. This is because the stack is designed to support and process only one GATT call at a time, and if, for

问题 I'd like to read the data from a specific characteristic of my remote BLE device to my Android tablet Nexus 7. The problem is that, I can receive the data by enabling the notification of that characteristic even without calling readCharacteristic . But I cannot successfully read characteristic by calling readCharacteristic without enabling the notification. mBluetoothGatt.readCharacteristic(characteristic) returns false. Thus the function onCharacteristicRead has never been triggered. I also

问题 Can anyone help me with the AT command to write characteristic value, Or how to send data from arduino to another ble device using Hm10 module. The HM10 after sending the AT+START, does advertise packets, and can detect the service and characteristic, But the characteristic value is the default 0x00, How can I change that? Have checked the data sheet multiple times but can not find an AT command that is capable of doing the same. UPDATE: Similar problem with setting the HM10 in Central Mode: