gatt

How to pair a Bluetooth Low Energy(BLE) device with Android to read encrypted data. Using the information in the Android BLE page , I am able to discover the device, connect to it, discover services and read un-encrypted characteristics. When I try to read an encrypted characteristic (one that will cause iOS to show a popup asking to pair and then complete the read) I am getting an error code 5 , which corresponds to Insufficient Authentication . I am not sure how to get the device paired or how to provide the authentication information for the read to complete . I toyed with

If we call setCharacteristicNotification on a character, not giving Remote Notification on value Change? How to enable the remote Notification on a Central Device in Bluetooth LE ? TO enable Remote Notification on Android, setCharacteristicNotification(characteristic, enable) is not enough. Need to write the descriptor for the characteristic. Peripheral has to enable characteristic notification while creating the characteristic. Once the Notify is enabled , it will have a descriptor with handle 0x2902 . so we need to write BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE to the descriptor.

ATT（Attribute Protocol）属性层是GATT和GAP的基础，它定义了BLE协议栈上层的数据结构和组织方式。 BLE属性协议，它是处于L2CAP协议层与GATT之间的一层属性操作协议。 GATT(Generic Attribute Profile)，通用属性协议，在GATT之上即是我们的应用程序，通过GATT统一属性格式和属性访问接口，对于APP开发来讲操作对象就变成了对一个个定义的属性进行读写。 主要由3部分组成：Handle、Attribute Type、Attribute Value其中Handle是作为索引的依据类似数组的下标，Attribute Type是根据UUID而定义的128bit标识(实际传输可以只传递16bit)，Attribute Value即属性值 如何发现和使用服务的一些标准方法: 发现规程 发现服务：发现所有首要服务、按UUID发现首要服务、查找包含服务。 发现特性：发现所有特性、发现所有特性描述符。 客户端发起规程：读/写特性值、读/写特性描述符。 服务端发起规程：通知/指示。 GATT profile的层次结构依次是：Profile—>Service—>characteristic 一个Service包含一个或者多个Characteristic（特征），也可以通过Include的方式，包含其它Service。

I have a wider range question here, so if someone could point me to a doc or article that could explain this, that would suffice. Needless to say, a days worth of googling has gotten me nowhere, and I could use a helping hand. I am connecting to a BeagleBoard with BlueZ 5.9, and my intent is to: Create a Gatt server, Load it up with some writeable attributes, and Advertise that server to connect to an android device. I've created the Android app that will connect and operate as the central, rendering 3 basically complete. I don't know how the commands - the literal things to type - to initiate

I'm running RPi with a USB Bluetooth dongle. When I use hcitool, I can discover the SmartTag device. But when I use gatttool, I cannot connect. It says "Host is down (112)". Here are my commands: $ sudo hcitool lescan LE Scan ... BC:6A:29:AB:DE:2B (unknown) BC:6A:29:AB:DE:2B SensorTag Checking for bluetooth adapters on my RPi I get: $ hcitool dev Devices: hci0 5C:F3:70:60:E6:1B Then, when I use the gatttool like this, I get: $ sudo gatttool -i hci0 -b BC:6A:29:AB:DE:2B -I [ ][BC:6A:29:AB:DE:2B][LE]> When I type connect, I get this: [ ][BC:6A:29:AB:DE:2B][LE]> connect Connecting... connect

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, and manipulate the data in the characteristics. Example: Gatt Server with 1 service which contains 3