Read buffer from bluetooth

[frohr]

Hi,
I try to use pybluez to read data from Arduino/bluetooth to Python on Win10. I have now working code for reading via USB and it works well. But I have no idea how to do it with BT. Now I can connect BT device and read some data but not exactly what I need.

OLD working code for serial:

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import serial import struct SAMPLES= 30000 v_data = [] s = struct.Struct('<' + str(SAMPLES) + 'f') ser = serial.Serial(port=serio, baudrate=2000000) ser.reset_input_buffer() ser.write("r".encode()) serial_data = ser.read(SAMPLES*4) unpacked_data = s.unpack(serial_data) v_data[0:SAMPLES] = unpacked_data[0:SAMPLES]

NOW I try this:

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import bluetooth import serial import struct v_data = [] ser = "" s = struct.Struct('<' + str(10) + 'f') SAMPLES = 30000 bd_addr = "FC:A8:9A:00:22:33" #itade address port = 1 sock=bluetooth.BluetoothSocket( bluetooth.RFCOMM ) sock.connect((bd_addr, port)) print('Connected') #sock.settimeout(1.0)   sock.send("r") print('Sent data')   while True:     v_data = sock.recv(100)     if len(v_data) == 0: break     print("received [%s]" % v_data) print(v_data)

I have this code in Teensy4.0:

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#include <SoftwareSerial.h> SoftwareSerial mySerial(0, 1); // RX, TX char inChar; void setup()  {   Serial.begin(38400);   Serial.println("I am ready to send some stuff!");   mySerial.begin(38400); } void loop() // run over and over {     if (Serial.available() > 0) {     inChar = Serial.read();     for(int i=0; i<100; i++) {       byte *b = (byte *)&i;       mySerial.write(b[0]);       mySerial.write(b[1]);       mySerial.write(b[2]);       mySerial.write(b[3]);     }   } }

But data seems like nonsense and it is very slow. With Serial I can read 30k values in 0.2s.
Is there any way how to proceed?
Thanks!


EDIT:
Main question is: Is possible send array of 30000 floats from Teensy/Arduino to Python via bluetooth in very short time? And how to receive it in Python?

[DeaD_EyE]

Bluetooth Classic is designed for continuous two-way data transfer with high Application throughput (up to 2.1 Mbps); highly effective, but only for short distances. So, it's a perfect solution in the case of streaming audio and video, or mice and other devices that need a continuous, broadband link. 07.04.2020

A float has 4 Bytes.
If you send 30_000 floats, then it's in size ~ 118 KiB big.

1	struct.calcsize("<f") * 30_000 / 1024

This will take minimum 54.5 ms.

1	(struct.calcsize("<f") * 30_000) / (2.1 * 1024 ** 2) * 1000

[frohr]

Thank you.

But how to read the dada correctly?
Now I have "while True:" and it is very slow for reading.
And values I see are:
b'\xc7\xb9\x8c\x10'
b'\xf4'
b'\x8c\xa80\x18'
b'\xe4\xf6\x9a\x84'
b'\x8a\x14\xef\x06'