pybluez | Bluetooth Python extension module

I am trying to receive GPS data from my HC-05 bluetooth module. I can see complete data in any serial plotter program, however I need to use Python executable for my Raspberry PI.

I have tried below code that I found from internet;

I have a device I'm making and its powered by the Raspberry Pi 3 B, and to access/control this device will be an app I'm developing using React Native.

1. The phone and RPi both have bluetooth turned on
2. The phone connects to the RPi's bluetooth signal
3. The user then starts up the app, and is able to send a command through to the app via bluetooth
4. RPi is able to read the data, and carry out the command.

That is the jist of it. From my understanding I will need to create a python program of some sort to deal with the incoming data. My problem is how do I even access that data? How does my python program understand that a connection has been made, and that it is going to receive information(in this case a .txt file)

I've seen some documentation about PyBluez, but i'm not entirely sure if thats how I want to go about doing it. Maybe that is the solution and I'm not understanding it correctly.

Sorry if this was too long, any advice will be greatly appreciated.

I have a python processes that monitor and interact with a Dbus service (NetworkManager)

Currently this runs in it's own thread from the main program

Well at the moment I try to learn more about Bluetooth, I've realized that to connect I need to send a packet to the device called inquiry packet. However for my script I'm more interested in broadcasting it, and even though pybluez provides the high level functions for it. I want to do it with sockets as part of learning experience. Can anyone please tell me, how to specify I want to send the inquiry packet? through the sockets like so s = socket.socket(socket.AF_BLUETOOTH, socket.SOCK_STREAM, socket.BTPROTO_RFCOMM) and how do I broadcast it, instead of sending to one adress?

I am using python3 with the Thonny IDE. My programms are running on a Raspberry Pi 4B.

I tried to install PyBluez on different ways, with pip and with the build-in package installer of Thonny. Every time the installation seemed to work. When I than tried to import the module via import PyBluez I always get this error message:

I am trying to install gattlib in Python in order to use some of its Bluetooth-tools.

The OS is ubuntu 18.04.4 LTS.

I have by now tried the following (as e.g. here):

I've got some Python 3.7 BLE scanning code which typically runs fantastic on a RPi3 device in production. However, recently I've seen devices* introduced into the environment that will crash the BLE Scanner in ways that I don't know how to prevent/detect.

*Note: A Windows 10 Lenovo laptop with Bluetooth chip Qualcomm Atheros QCA61x4 Bluetooth 4.1 can bring this code to its knees. I've also heard that folks running the above next to a BLE Beacon site also crash frequently.

The crash occurs during the pkt = my_sock.recv(255) command and the exception is a _bluetooth.error (32, 'Broken Pipe')

Here is a minimal code example below that demonstrates the problem:

in my current project it is a requirement to send a file from a windows computer to an android device over bluetooth without anything on the phone other than it's standard state and of course a paired bluetooth connection. i've looked over pybluez and it seemed simple enough to send files between a client and server architecture (and in fact got it sending between my laptop and desktop rather quickly) but I cannot for the life of me find any way to get python to send a file from the computer to android once the connection is established; my attempts have been grabbing the bluetooth mac address like thing from the device like so

I'm using a Raspberry PI compute module 3 in a custom motherboard connected to an ESP32 using HCI over UART to connect to a mobile phone over bluetooth. It partially works: The phone is able to pair with the device, the device can see the phone in the bluetoothctl UI, SDPtool can see the services (RFCOMM) exposed by the device.

However, when I use pybluez, certain functionality does not work: First I tried using the device as the bluetooth slave. This is my preferred configuration. btmon showed the phone trying to connect, but pybluez never gets past sock.accept(). The code is pretty much exactly what you see in the example on pybluez github, and I've used the same code successfully with a stock Raspberry Pi Zero W (with the integrated bluetooth) successfully.

The phone shows the following error in the socket.connect() command: W/System.err: java.io.IOException: read failed, socket might closed or timeout, read ret: -1 W/System.err: at android.bluetooth.BluetoothSocket.readAll(BluetoothSocket.java:698) W/System.err: at android.bluetooth.BluetoothSocket.readInt(BluetoothSocket.java:710) W/System.err: at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:387)

Hard to find anything of value in the Pi device's logs, but I did see this in btmon:

ACL Data RX: Handle 128 flags 0x02 dlen 14 [hci0] 75.711662 L2CAP: Command Reject (0x01) ident 5 len 6 Reason: Invalid CID in request (0x0002) Destination CID: 0 Source CID: 0

I also tried using the Android hack for connecting directly using a channel ID rather than a UUID (essentially skipping the SDP lookup) - I got the channel ID using sdptool browse local, and this resulted in the same error.

After exhaustively trying different things I switched gears to trying to use the phone as the bluetooth slave instead of the device. Here I see more success, but still things aren't working as expected: discover_devices from pybluez doesn't report any devices, although the phone and bluetoothctl both show the devices as paired. However, if I hardcode in the device address I see in bluetoothctl, I am actually able to connect.

I'm convinced that something is screwed up with the bluetooth configuration, perhaps the versions of bluez or pybluez, but I can't find anyone else who has reported these sorts of issues. I'd note that I'm using the compatibility mode switch on the bluetoothd service (otherwise it doesn't work at all). Bluez version is 5.43 I believe.

Has anyone seen anything like this? Any suggestions for troubleshooting these issues (different versions of bluez, etc)?