gatt

BLE GATT onCharacteristicChanged not called after subscribing to notification

由 扶醉桌前 提交于 2020-01-23 05:32:22
问题 this is my first post on SO. I have some problems subscribing to GATT notifications on android 5.0.2 . What I aim to do is to connect an Arduino with a BLE Shield to my Android phone. I have a sensor connected to the Arduino and want to send the data from the Arduino to my phone by using the BLE shield. There is a nRF8001 on the shield which is the server, my phone/app is the client. What I did so far was to create an Android app which scans for BLE devices. It can connect to a device and

Android BLE GATT Peripheral Mode Notifications

由 狂风中的少年 提交于 2020-01-11 07:47:13
问题 I'm trying to set up an app to behave as a BLE peripheral device using the Android 5.0 (21) api. So far, I've set up the server, got advertising and connections working, set up custom GATT services and characteristics, and can read and write between the peripheral device and other testing devices. Now I'm trying to add notifications to a few of the parameters but simply put; they're not working. When defining these characteristics, they include the notify property: BluetoothGattService

Android Peripheral BluetoothGattServerCallback onServiceAdded() not getting called

由 一世执手 提交于 2020-01-04 13:47:51
问题 So I have a simple Peripheral application that I am coding in Android Studio running on my Samsung S8 mobile phone. I can setup all my BLE Advertisements and Characteristics just fine but when I add my services. I am not seeing expected results when connected from a another Central device (ie. another mobile phone that has an app to discover bluetooth advertisements). LogCat output from Android Studio: As per the Log, I can only see 2 default services that are Generic Attribute(1800) and

关于CC2541蓝牙开发板的学习笔记-3

由 烈酒焚心 提交于 2020-01-03 05:24:08
下面进行一个简单地BLE协议栈基础实验：数据传输试验。其实就是BLE协议栈安装后的主从通信实验，实现两个BLE节点的通信，主机向BLE从机发送一个字节，然后把写入的字节读回来，以测试主从之间的通信。 SimpleBLECentral主机编程： 在低功耗蓝牙中有四种设备类型：Central主机、、Peripheral 从机、Observer 观察者、Broadcaster 广播者。通常Central 和Peripheral 一起使用。然后Observer和Broadcaster 一起使用。 我们首先从最简单的主机SimpleBLECentral 和从机SimpleBLEPeripheral 开始。打开SimpleBLECentral 工程。打开SimpleBLECentral.c文件。 #define GAPCENTRALROLE_MAX_SCAN_RES 0x404 //!< Maximum number of discover scan results to receive. Default is 0 = unlimited. // Maximum number of scan responses #define DEFAULT_MAX_SCAN_RES 8 // Setup Central Profile { uint8 scanRes = DEFAULT_MAX_SCAN

How to get Disconnect Event from GATT Server on Bluez/Linux

由 杀马特。学长 韩版系。学妹 提交于 2020-01-02 10:25:32
问题 Environment: Bluez 5.14, Linux 3.1, USB Plugable BLE radio, TI BLE keyfob (CC2541 dev kit) Linux Device <---hci----> USB BLE Radio We enabled key press events on TI keyfob using gatttool and started to listen for events gatttool -b [hardware ID] --char-write-req -a [handle] -n [value] --listen (gatttool -b 90:59:AF:09:E1:5D --char-write-req -a 0x0048 -n 0100 --listen) Pressing buttons on the keyfob and see these events Notification handle = 0x0047 value: 02 Notification handle = 0x0047 value:

BluetoothGatt: negotiating new MTU succeeds but new size cannot be used (3 bytes difference)

由 主宰稳场 提交于 2020-01-02 01:35:07
问题 I'm working on an app that exchange data between devices using BLE. In order to get better performance, after connecting two devices I'm negotiating to increase the MTU in order to exchange bigger data packages over BLE. Once the BluetoothDevice is connected and all services and characteristics are read, I request to increase the MTU using: private void requestMtu() { //gatt is a BluetoothGatt instance and MAX_MTU is 512 this.gatt.requestMtu(MAX_MTU); } After that, on the

iOS Bluetooth dual-mode; connect BLE (GATT) to an already connected BR/EDR (A2DP/HFP) stereo headset simultaneously

由 断了今生、忘了曾经 提交于 2019-12-29 19:19:06
问题 I'm developing a stereo headset with Bluetooth using the classic profiles (HFP, A2DP, AVRCP) as one would expect Ina stereo headset. However, I want to deploy a remote control app for iOS, and use it simultaneously to the other classic links, but the dual-mode chipset I'm working with in my design does not behave as I'd expect; The headset is setup as a peripheral, letting the iOS device act as central. As such, the peripheral advertise its BLE services (with my specific 128-bit UUIDs) and

BlueZ: How to set up a GATT server from the command line

由 ⅰ亾dé卋堺 提交于 2019-12-28 05:45:08
问题 I would like to know if there is a way to set up a gatt server from the Linux command line. I know that the BlueZ gatttool command allows you to act as a gatt client and interrogate a remote gatt server, however, I do not think that this tool can be used to set up a server. What I want to achieve is a gatt server, created from the command line , and can be interrogated by any central device (e.g. iOS or Android device) to connect to the GATT server, discover the services and characteristics,

OnConnectionStateChange not called after disconnecting device

由 試著忘記壹切 提交于 2019-12-24 18:23:02
问题 I'm facing a problem when I disable bluetooth from parameter. I use a Broadcast Receiver to listen this action and when its state is turned off I call a method to disconnect my peripheral. In my log I only see D/BluetoothGatt: cancelOpen() but according to BluetoothGatt.class the service calls our BluetoothGattCallback in disconnect method with onConnectionStateChanged turns to DEVICE_DISCONNECTED and I have nothing after 20 or 30 seconds too (supervisor timeout). When I want to disconnect my

Bluetooth GATT UUID

由 元气小坏坏 提交于 2019-12-24 16:04:49
问题 I'm trying to build an android app that uses the BluetoothLE. In tutorials they use a 128bit UUID but I only have the 16 bit UUID. I have to create a new 128 bit UUID using the service UUID and the Bluetooth Base. Example : Alert Notification Service UUID (16bit) => 0x1811 Bluetooth Base UUID (128bit) => 00000000-0000-1000-8000-00805F9B34FB By combining those two UUIDs, we receive... Alert Notification Service UUID (128bit) => 00001811-0000-1000-8000-00805F9B34FB Is there a proper way to do
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