Bleak | Windows native DLL injection library | Cybersecurity library

I am trying to plot sensor data in real time using an ESP32-based sensor and BLE. I've attempted to use Bleak and combine the simple scrolling example from the PyQtGraph package. I know that the sensor data is been read correctly from the ESP32, but there is no plot appearing, so clearly integrating the code incorrectly.

My current code:

I'm having an issue with the useEffect hook on this blog site I'm building. Im trying to fetch all the blogs from the backend so I can use them to populate this section with the latest five blogs. When I use the code below, the empty array in the useEffect prevents the infinite amount of fetch calls, which is great.

But then I run into a problem where if I refresh the page or navigate back to it I get an error on line 35 saying "cannot find mainImage of undefined".

My question is how do I have the fetchCall populate the state and do so even on a refresh so that I can still access the info I need. Thanks!

So far, this code is returning me the UUID of the service. But I have several characteristics inside of it, can I discover their UUID?

I try to use Python to control some BLE GATT devices. I find Bleak (https://bleak.readthedocs.io/en/latest/) this library to communicate with GATT device.

When I use it, most of the time it works really well.

But once I try to communicate with a BLE GATT medical equipment, I found I can't always notify with this equipment.

Here is my code, I just do a little changes from Bleak's github example：(https://github.com/hbldh/bleak/blob/develop/examples/enable_notifications.py)

I'm trying to make a UI which communicates in the background with several BLE devices. For that I've implemented a separate thread which runs an asyncio.loop. This is necessary because I use bleak 0.9.1 to connect to the devices.

Using signals and slots to get data from the UI-thread to the worker thread works fine. However, it does not work in the other direction. As far as I know this is because the thread is busy running the loop and never stops doing that. Therefore, it cannot process the inputs from the UI-thread.

Below there is an example code which shows the problem.

Is there any way to process the input slots in the thread while running the asyncio loop?

I have created a GATT Client in python using the Bleak Library. I subscribe to a notification characteristic and after when I get the callback in the notification handler function, I do a write to a characteristic.Until now, after I start the notification I used put a asyncio.sleep for 5 seconds and then I would do a write on the characteristic. But this is very flaky and there is no control over the code, so I want to wait until I receive a callback in notification handler function and when I get the response, I want to do the write. I am new to python async IO and I am not sure how to achieve this. Thanks for your time and effort.

Here is the Code:

I'm trying to run the next code with python3 ble.py:

I was looking for a way to spawn different threads (in my actual program the number of threads can change during execution) to perform a endless-running operation which would block my whole application for (at worst) a couple of seconds during their run.
Because of this, I'm using the standard thread class and asyncio (because other parts of my program are using it).

This seems to work good and according to this thread it seems to be okay, however when searching for asynchronous threading and asyncio I'm often stumbling across the suggestion of using ProcessPoolExecutor (e. g. in this stackoverflow post). Now I'm wondering, if the following way is really good practice (or even dangerous)?

I have a raspberry pi zero setup as a BLE GATT server, which I followed exactly with this guide.

My ultimate goal is just trying to send a text from the pi zero to my laptop.

Being a little familiar with python, I have tried to use Bleak to communicate with the GATT server but for some reason, I'm never able to connect to the GATT server. So I gave up trying to tinker with Bleak.

( Please note that I have used nRF Toolbox to verify that the pi zero BLE GATT server is set up correctly )

Fast foward, one day I saw this BLE GATT Client Sample from Microsoft. So I downloaded VisualStudio and followed the guide to deploy the sample.

Everything worked fine, I can connect to the GATT server and write data to the specific RX characteristics.

But the real problem resides on the TX characteristics, when I try to send data from the GATT server console to the laptop. The BLE Client Sample will show the value as "Unknown Format"

It seems that the data will be encoded ( value.append(dbus.Byte(c.encode())) ) with this before updating the TX charactersitics.

I tried to Google about this, but any further research will only make my head burn harder.

I'm sorry, can anyone tell me how to fix this "Unknown Format" data decode problem?

Thanks so much in advance.