BTLE | Arduino library for basic Bluetooth Low Energy

I am trying to get filtered RSSI values of each BLE beacon using Kalman filtering. I cannot use a single instance of kalman filtering on all BLE devices, how to map or assign a instance of kalman filter for each BLE device. I know it has something to do with maps but cannot figure out how to implement it. Any help would be much appreciated.

I use the bluepy module to connect to an Arduino board with BLE running a battery monitor.

My Python script is working perfectly fine. I get the values I expect. But I do not like the solution because the binary value read from the characteristic is interpreted as an ASCII character before getting the decimal representation of that ASCII character.

I tried to use the binascii module

Is it possible to connect to a bluetooth device that supports Bluetooth 4.0 LE but has a password.

I can connect to the device from an iphone and print (which only supports BTLE) but when I try and connect from chrome (OSX) / web-bluetooth it does not prompt me for a password. I can return a device using:

I have a Bluetooth LE scan running which filters for specific Devices. This works fine and I see that the devices get actually added to my list. But it doesn't trigger anything on my MainActivity. Here is a snipped from the relevant code (it does work similar to a normal scanCallback from BTLE):

I'm trying to read data from the BTLE fitness machine service, specifically the Indoor Bike Data characteristic.

A typical reading I'm getting has the bytes 44-02-9c-09-5c-00-4f-00-50. The first two are flags which indicate that the rest of the bytes represent, in order:

• Instantaneous cadence (uint16)
• Instantaneous power (sint16)
• Heart rate (uint8)

The trouble is, that only accounts for 5 more bytes, but there are 7 more bytes in the value. It looks like 5c-00 is cadence, 00-4f is power, and 50 is heart rate, but

• I don't know what the 9c-09 represents, but more importantly,
• I don't know how to reliably read this characteristic if it's going to send me data that the flags field says is not present.

What do I need to do to parse these bytes correctly? In this specific case I could maybe skip those two bytes, but that won't be reliable over different device manufacturers.

Update: FWIW I don't think it was correct to mark this as a duplicate. I was able to parse the bytes, the problem was that the result appeared to contradict the fitness machine spec. The accepted answer clarified that.

I am collecting pressure sensor data from 4 Arduino Nano 33 ble to a raspberry pi 4. I am able to receive the data from all the sensors. Now, I want to send this received data to another Raspberry Pi 4 using BLE communication in real-time such that the first Raspberry Pi acts as a repeater. I searched but could not find a suitable approach or solution to implement this. The first Raspberry Pi could act as a peripheral/client sending all the received sensor data and the second raspberry pi could act as a central/server to receive all the sensor data which can be further displayed on web interfaces or stored in a database.

I tried connecting initially with one Arduino and sending its data over raspberry Pi. I have written the code for Raspberry Pi Client and Server using Bluedot library in Python.

Raspberry Pi 4 Client code

I (like others) have multiple disconnects between a RPi4 central(client) and ESP32 BLE peripheral(server). Using the "nRF Connect" app on a android phone, the connection to the ESP32 is robust. However, RPi4 - ESP32 BLE communication is VERY unstable. This finding implies the fault is with the RPi and/or code. The initial BLE connection occurs faithfully but the connection inevitably drops after a random number of successful reads (usually 1-50 reads). I am using BluePy 1.3.0 with a new Raspbian image on a RPI4. I attached skeleton code and the error message produced after a random number of successful Reads.

I am trying to send realtime data from a sensor through flask to the front-end through jquery. Right now my script uses setInterval(..., 1000); to update the data through a ajax request.

However, I would like to update the jquery request when new sensordata is received from flask, as the framerate from the sensor differ and its hard to set a specific interval to make it realtime.

Is it possible to use some kind of signal in the jquery code when new data is sent through @app.route('/data')?

Python script:

When doing Bluetooth communications one is often placed in a situation where one does a call which gets a response in a delegate, for example the characteristic discovery shown below: