115 questions
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Acknowledging Indication on ESP32 / Arduino BLE Communication
I have an ESP32S3 communicating to a proprietary device via BLE. I can connect to two of the services and underlying characteristics on the device and get notifications just fine. However one of the ...
- 137
0
votes
2
answers
95
views
The pros and cons to use proper and improper characteristics for a MySQL function?
I created test() function with the proper characteristic DETERMINISTIC as shown below because it always produces the same result 3 according to the doc:
CREATE FUNCTION test() RETURNS INT
...
- 42.7k
0
votes
1
answer
399
views
Correct data for 0x29AD BLE Weight Measurement? Currently seeing no value
Working with Arduino ESP32.
I managed to implement Environment temp + humidity using the specified BLE spec service and characteristic UUID's. I got lucky as I could see that the values were ...
- 1
0
votes
1
answer
891
views
Write value as (command) to a BLE characteristic via Javascript
I am working on a Project, and I am new to BLE, I have got problem with writing value to BLE characteristic (run command on BLE device).
The characteristic take these values:
0x04 0x01 – Lock mode is ...
- 1
3
votes
0
answers
2k
views
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 ...
- 59
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660
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How to enable notifications on exactly 2 characteristics in Android?
I want to be able to receive notifications on exactly 2 characteristics. Said characteristics are RX and TX from the perspective of the BLE device I am communicating with. I have succeeded in doing it ...
- 319
1
vote
0
answers
898
views
flutter_blue some characteristic properties are not working correctly
i am using any app that include flutter_blue package . I want to read , write and notify to some characteristics.
I'm having trouble writing to a characteristic. When i use another package or another ...
- 11
1
vote
1
answer
81
views
central unsubscribes from characteristic when restart app
IOS app is a peripheral. After pairing, peripheral can successfully update characteristic value to and indicate to subscribed central via updateValue:forCharacteristic:onSubscribedCentrals:
When I ...
- 239
4
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0
answers
3k
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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 ...
- 41
1
vote
2
answers
761
views
BLE Android how to pass characteristics to use in Fragment
I got a BLE tutorial working. I can send and receive data on the SPS service, this data TX RX is done in Dialog_BTLE_Characteristics. It looks like the characteristics & services are passed from ...
2
votes
2
answers
1k
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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. ...
- 101
0
votes
1
answer
583
views
Long characteristic on web bluetooth
BLE allows transmitting from 2 up to 256 bytes as the payload in a single burst. But, the long characteristics on android/ios can be read in chunks. What happens on web-bluetooth?
Can web bluetooth ...
- 3
0
votes
1
answer
2k
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Android BLE Read characteristic, When I read data(large) I get the last part only. Not the complete data. What can I do to get the full data
I am sending data to BLE Device as 20 bytes chunks.
I am receiving back large response.
But onCharacteristicRead call back, I get only the last piece of the data.
byte[] messageBytes = characteristic....
- 35
0
votes
0
answers
574
views
Bluetooth Low energy gatt data sending too much information
I have an issue with my code being that I pass 51 bytes to a ble characteristic and, then call a function to send this to my phone via a pr established GATT connection however, it sends far more data ...
- 830
0
votes
1
answer
78
views
How to Identify values from characteristic data for Walk Run Stride bluetooth sensor
I am developing a workout app with sensor connectivity and able to read and get data for Heart rate sensor but for stride sensors (walk/Run) facing problem to map the values given by sensor ...
- 2,885
0
votes
0
answers
266
views
Convert UInt8 array of bytes to explicit values from characteristic.value
I try to convert my UInt8 array to an explicit value but I try in several ways but I can't get values that I can understand.
How have i to do to get explicit values?.
My array of UInt8 :
[216, 61, ...
- 109
5
votes
1
answer
8k
views
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 ...
- 83
0
votes
0
answers
268
views
Bluetooth Low Energy device to trigger webservice call
I am looking for a software or easy to use library where I can connect to a BLE device (simple button, like key finder) that could trigger http request upon click.
I already have rest api available ...
- 1
3
votes
1
answer
3k
views
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 ...
- 35
0
votes
0
answers
171
views
How to fix this code when bytes are longer than 20?
I am trying to figure out how to parse the value from a Bluetooth device with a characteristic which has more than 20 bytes in its value.
I have the code below which basically fires each time the ...
- 125
1
vote
0
answers
399
views
createCharacteristic with 3 or more characteristic properties for BLE application?
I am working on a BLE application using ESP32 Arduino Platform and having a concern about having 2 or more Characteristic Properties, and wonder if the statement below is valid and efficient? I've ...
- 21
1
vote
0
answers
124
views
Definition of Characteristics for the Object Property hasTopping in Different Contexts in OWL
Different burgers have different toppings like cheese, onions, beef, salad. Let's consider hamburgers and cheeseburgers as possible burger instances and the object property "has_Topping" to define ...
- 667
0
votes
1
answer
214
views
Is Data Written to a BLE Characteristic Returned after Write
I have a working BLE app that reads data from a scanner and am sending configuration to the scanner before reading begins. I use the following code to send a string to the scanner.
let configItem = "...
- 1,214
5
votes
1
answer
21k
views
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 ...
- 133
1
vote
1
answer
7k
views
BLE receiving GATT notifications from a characteristic
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 ...
- 2,142