gatt

Android BLE - Connecting to multiple devices seem to fail and GATT Response is the same for both connections?

由 懵懂的女人 提交于 2019-12-13 16:30:40
问题 I am developing an Android Application that connects to a BLE Device and reads the specific GATT Characteristics and Services that I need to check. I used the BluetoothLeGATT example from the Android Dev site as my reference. I can connect to a predefined Address without problems and read the GATT Attribute updates. What I want to do next is to be able to connect to two BLE Devices simultaneously. However, this seems to be a challenge. What I did was to essentially duplicate the code needed

BLE receiving GATT notifications from a characteristic

由 隐身守侯 提交于 2019-12-13 02:49:02
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

Cannot establish BLE connection between Android 5 and BLE device

由 牧云@^-^@ 提交于 2019-12-12 21:34:27
问题 I'm stuck with implementing connection between Android Lollipop smartphone and BLE device (TI experimenter board with BLE module). I use following call to connect: device.connectGatt(context, true, mGattCallback); I've managed to establish connection for Android 4.3 and 4.4, but when I use this same code for Android 5, I get following error on BluetoothGattCallback::onConnectionStateChange : onClientConnectionState() - status=133 clientIf=5 device=D0:36:12:CD:73:49 Error code 133 means GATT

Can't read Gatt characteristic (gatt error 15)

由 老子叫甜甜 提交于 2019-12-12 18:52:03
问题 I'm trying to read a characteristic right after gatt connected and services discovered successfully. But receives error 15 (0x0f, GATT_INSUFFICIENT_ENCRYPTION) and then 137 (0x0089) in onCharacteristicRead gatt callback. After this error gatt disconnecting immediately. My device is Samsung S4, 4.4.2. 回答1: As far as i know both errors, "GATT_INSUFFICIENT_ENCRYPTION" and "GATT_INSUFFICIENT_AUTHENTICATION" gets occurred when you try to do a GATT operation that requires encryption. This means

How can I reconnect to BLE device? - UWP

由 淺唱寂寞╮ 提交于 2019-12-11 14:58:49
问题 Both the device id and the address are random that I CANNOT re-use them for bleDevice = await BluetoothLEDevice.FromIdAsync or bleDevice = await BluetoothLEDevice.FromBluetoothAddressAsync . I came up with 2 possible solutions: (1)ConnectionStatusChange & (2)Pairing, but both cases I have problems. (1) MAIN QUESTION Before I disconnect, I first save the bleDevice as bleDeviceReconnect . Then I unsubscribe, dispose characteristics & service & bluetooth le device, and set them to null. In the

Null pointer exception error sending a characteristic BLE android

由 久未见 提交于 2019-12-11 10:19:09
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

BLE: Lower MTU value size(big difference) after MTU exchange

由 自作多情 提交于 2019-12-11 06:06:55
问题 I am new to the BLE development. I want to send some large amount of data over a BLE connection with maximum throughput. I have a GATT server, which is running on Linux, and a client which is running as an app on Android. I have created a custom characteristic with the maximum allowed size(512 bytes). I am requesting it from the app with a read operation. Every time I receive a call for reading on the server side I change it's value until I am finished with all the data(I know this isn't the

Movesense direct access to GATT endpoints

由 ☆樱花仙子☆ 提交于 2019-12-10 12:07:39
问题 I am trying to read ECG real-time data from a movesense sensor by using another generic BT-LE module. GATT characteristics can be used for Heart Rate (read or notify) or other predefined services : we simply send a raw command to an endpoint, for example a 0x0100 (START_NOTIFY) on the corresponding UUID for a heart rate notification streaming. The problem is that with a micro controller and a BT LE module we can not use any of the C, Java, React... libraries since all of the underlying code

Gatttool: Limited to 5 connections?

由 被刻印的时光 ゝ 提交于 2019-12-10 09:40:41
问题 I connect to five devices by spawning gatttools with pexpect in python*. When I try to connect to a sixth device (using the same CSR 4.0 dongle for all connections) manually I encounter: sudo gatttool -b DC:05:4F:BC:F6:4A -It random [DC:05:4F:BC:F6:4A][LE]> connect Attempting to connect to DC:05:4F:BC:F6:4A Error: connect error: Too many links (31) Is this a gatttool limitation or a hardware limitation? I cloned the source at http://git.kernel.org/cgit/bluetooth/bluez.git and ran grep -r

Ble蓝牙设备之(搜索/链接/获取uuid数据)思路分析以及完整Demo

由 一个人想着一个人 提交于 2019-12-09 09:02:53
1，本文主要讲解蓝牙数据的搜索–链接–获取数据值–写入数据值； 蓝牙Demo 一：搜索蓝牙设备名称 二：建立链接 三：读取传递过来的值 四：写入数据 蓝牙项目该配置的具体事件 <!-- 检测蓝牙状态 --> < uses-feature android:name = "android.hardware.bluetooth_le" android:required = "true" /> < uses-permission android:name = "android.permission.ACCESS_NETWORK_STATE" /> < uses-permission android:name = "android.permission.INTERNET" > </ uses-permission > <!-- 增加蓝牙所需要的权限 --> < uses-permission android:name = "android.permission.BLUETOOTH" /> < uses-permission android:name = "android.permission.BLUETOOTH_ADMIN" /> 结合自己最近的项目需求，和自身所学所得，代码基本上利用官方的sever服务和gatt链接，只是通过修改获得自己想要的结果，下面就简单介绍一下自己的理解。 一
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