bluepy | Python interface to Bluetooth LE on Linux

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

Used lang is Python.
I am trying to decode the color sensor data from the Thingy52 to RGBA. To interface with the Thingy52 I use the thingy52.py example in https://github.com/IanHarvey/bluepy/tree/master/bluepy Four examples of the received raw data:

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:

I'm trying to connect two Arduino device to the raspberry pi using the csr 4.0 dongle. I've tried python3 and bluepy, but always one of them failed to connect! I've also tried to connect to them using bluetoothctl at the same time, but I got this:

i'm trying to connect to a bluetooth le body scale with my raspberry pi. Because i can't connect to it, whether if i use python-bluepy or gatttool i tried to get more information and read the advertisment packet with sudo hcitool lescan --duplicates & and sudo hcidump --raw. I download the Bluetooth Core Specification for versions from 4.0 to 5.1 from bluetooth.com. But the data i get from hcidump does not match the bluetooth specifications exactly. I tried other devices, an iPhone 7, Sony WH-1000MX3 and Oculus Quest. They all send LE packets but all in the (in my opinion) non-standard packet format. This is a packet i received from the scale (mac a0:91:53:e2:58:db): 04 3E 2B 02 01 03 00 DB 58 E2 53 91 A0 1F 02 01 04 03 03 B0 FF 0F FF AC A0 DB 58 E2 53 91 A0 A2 AD A0 A3 06 B8 07 09 41

The first thing, that i don't understand is the preamble 04. All of my devices use this. But the specification says advertisment packet should have a preamble of 0xAA. And even data packets should have 0xAA or 0x55. But never 0x04. Next thing is the access address. For advertisment should be 0x8E89BED6 but not a single one of my devices use this. I also don't unserstand the PDU header. Lenght is 0. The payload almost matches the specification, but there is a byte after the hardware address (1F) that shouldn't be there. As i said, all of my devices use this format ("wrong" preamble, access address, PDU header, additional byte in Payload). And some devices have only one byte CRC. So i am wondering if i understand something completly wrong. Can anyone explain what kind of package those are or why they don't match the specification?

BLE Advertisment Package

I wrote some Python3 script, that scans for devices. If they match a "name" I am connecting to them and do some ble stuff. The script is build on top of the bluepy module.

One think I don't like, is that I need to run the device scanning as sudo(like sudo python3 getDev.py). Any ideas how to make a user being able to scan without root rights?

Guess I need to add the local user to a group etc. Any ideas are welcome