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Questions tagged [characteristics]

113 questions
16
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1 answer

How to Write consecutive Characteristic fast and stable for BLE in Android?

I am developing BLE in Android , I can scan, connected and write characteristic to to the BLE device. I call the following function to pass BluetoothGatt and characteristic to AsyncTask when click the Button. write_btn.setOnClickListener(new…
Wun
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12
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2 answers

Android How to read BLE properties Readable Writable Notifiable GATT Characteristics

How to read BluetoothGattCharacteristic properties like is characteristic Readable, Writable or Notifiable.
AZ_
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11
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2 answers

How to enable multiple BLE characteristic notifications on Xamarin/Android?

I am trying to enable notifications for more than one BLE characteristic using Xamarin/Android but seem unable to do so. The app seems to stop receiving any BLE events if I try and enable more than one at a time. Can anyone confirm whether this is…
Duncan Groenewald
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8
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3 answers

definition of static arrays

I've been looking for a decent definition of static arrays. I've tried using msdn and c# sources but cannot seem to find a definition. It gives examples, but no definitions... Does anyone know any links or definitions and characteristics of a…
Simagen
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8
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2 answers

How to get data out of bluetooth characteristic in Swift

I've got a Polar h7 device around me right now (it's BTLE) and I've got everything working but I am confused about how to get the BPM our of the characteristic.value now that it is updating. I have to turn some bytes into bpm... My peripheral is…
Johnston
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8
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1 answer

Cannot read characteristic. Android BLE

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.…
Magic
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7
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4 answers

HM10 ble change characteristic value AT command Arduino

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…
Aakash Thakkar
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6
votes
1 answer

Android Bluetooth not discovering the characteristic after changing UUID

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…
ulusoyca
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5
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1 answer

Read characteristic value using Android BLE

I am relatively new to BLE, android development and java. I am trying to send 20 pieces of data from a microcontroller, via BLE, to my android phone. Using the nRF connect application, I know that the services and values are being created correctly…
stellarhawk 34
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5
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1 answer

What is the length limit for BLE characteristics?

I am reading the Bluetooth Core Spec. v 4.2 document, but I can't find any information about the characteristic length limit. What is the length limit for characteristic of BLE services?
Jdoe098767890
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5
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1 answer

Android BLE, can not really write characteristic

I'm working on a Android project which is to connect Nexus 7 and a bio sensor through BLE link. The problem is that, I can successfully detect and get list of services and characteristics of the sensor. When I write some data to the specific…
Magic
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5
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2 answers

Writing multiple Bluetooth Low Energy characteristic values with response

The Bluetooth Core Spec V4.0 Vol. 3 Part G Section 4.9.3 states, that for writes of characteristic values with response, the Attribute Protocol Write Request procedure is used. Bluetooth Core Spec V4.0 Vol 3 Part F Section 3.3.2 describes,…
Etan
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4
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0 answers

Flutter Blue Read Values from 2 Characteristics with notify

I'm a beginner in flutter and want to program a app with Bluetooth LE. I use flutter_blue. My App works if i only want to read the value of one characteristic. Now i need to read a second characteristic and that is the problem. I'm using a example…
MBard
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4
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1 answer

How to write a value to characteristc for BLE Device in ios swift

I'm working on iOS BLE app to charge a mobile phone. I did everything correct up to discover characteristics. First Scanning peripheral and connected to it. Discover the services(FFB0) and characteristics(FFB1, FFB2) which having notify and write…
Bhasker
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4
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Record Access Control Point BLE explanation - glucose

I'm trying to get glucose measurements from glucose meter (Contour One Plus) with Bluetooth LE. I'm able to connect to device. I don't know how to start with Record Access Control Point. I can discover all of characteristics and services. I am…
Kunka
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