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Questions tagged [characteristics]

113 questions
4
votes
3 answers

How can read all characteristic's value of my BLE device?

I'm building an app with Android Studio that can read the value from a device BLE. This device, have 4 services. The fourth services have 3 characteristic. I want to read the all characteristic of this fourth service. This device, can send more…
bircastri
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Does Android getProperties method return the flag field of a Bluetooth characteristic?

I’ve been studying the Heart Rate Measurement Characteristic documentation in order to understand what each byte of the characteristic means. My understanding is that the least significant byte of the characteristic corresponds with the flag field.…
rebecca
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Flutter Blue characteristic length is limited

I am developing an app in flutter using flutter blue plugin where i am getting the data from a customized bluetooth low energy controller all the neccessary data is in characteristic of the property of notify listner. when i listen the data its 16…
Abid Hussain
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How to write value to existing characteristics in BLE Device in Ios swift

Im working on ios Ble app to charge mobile phone.Im done everything correct upto discover characteristics.First Scannig peripheral and connected to it. Discover the services(FFB0) and characteristics(FFB1,FFB2) which having notify and write with out…
Bhasker
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1 answer

Read values from concrete BLE characteristic Kotlin

I'm trying to read values from a concrete BLE characteristic in my app but at the moment I try to read values from the desired characteristic the onCharacteristicRead function seems like not being triggered. In very first place i use…
Sosa
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3
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2 answers

Bluetooth LE listen to multiple characteristic notifications

I'm using BLE application on an Android phone communicating with a custom BLE sensor board. There are two characteristics provided by the board, acceleration and ecg. On the phone side, I'd like to receive the notifications of two characteristics…
Sentimental
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1 answer

Can't discover desired service from bluetooth le device

I've made app that allows me to connect to bluetooth le device and lists all services and characteristics. However the only recognized service is 'Device Information Service', there is also 'Unknown Service' but it doesn't seem to pass data that im…
Michał Witanowski
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3
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1 answer

Android BLE NullPointerException when trying to write characteristic

I am new at Android app development, and this is my first attempt at getting an Android device to speak to a BLE device (which will speak to a microcontroller). The goal is to send a value, in this case the string "green" or "blue" converted to…
AndresB
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1 answer

Having trouble with custom UUID in Android BLE

I have a problem with using my own generated UUID(not using 16 bit UUID reserved by Bluetooth SIG) to communicate in Android BLE. Target device is two - one is as a peripheral(Samsung galaxy note 4/android 5.1.1) and another one is as a…
Sunggook Kim
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Samsung Android BLE multiple read/write

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,…
ulusoyca
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How to decode byte value of characteristic (python)

For a project I'm currently trying to get some heart-related data (ppg) from a sensor (Polar OH1) via Bluetooth le. The service, which the manufacturer of the sensor uses is not documented very well. Now, when reading the characteristic value of the…
nepho5
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1 answer

iOS BLE Characteristic Control Point Write - ATT Error

I'm having trouble performing a write on a control point characteristic. Perhaps I'm providing an erroneous value, as I don't fully understand the nature of a control point. I've noted some of the specs about the control point value next to…
J. Doe
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2 answers

[RPi3][Bluez] Managed to connect to a BLE device but can't list GATT attributes

I am doing a project where I need to create communication between two Raspberry Pi 3 on stretch (RPi) wirelessly with callback functionalities using C++ code. The first is supposed to send data to the second one. I decided to create a bluetooth…
Valentin D.
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4 answers

musical analysis with computer

I am trying to analyze music from mp3 files. I want to get information regarding tempo, pitch, and other musical characteristics. How can I get this data? Is there open source software that gives me this information, or even better, a library? Can…
gerard
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1 answer

Android BLE Service missing Characteristics

I am running a custom service with custom characteristics on a BLE 4.2 device. I am working on an android app to read/write the characteristics etc. The first thing I try is to read the characteristics. I define a list of UUIDs: List chars =…
rich
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