nrf | Nrf is RTMP splitting Frontend

I am using Web Bluetooth to connect to a device and read the name and battery level. I got it working but the device I want to connect with is "Unknown or unsupported" but I have no idea why. On requestDevice() I only get my Iphone and a lot of unknown devices.

When I check the bluetooth devices on chrome://bluetooth-internals I see a few known devices but not the one I am looking for. I have to guess the right device based on the latest RSSI. This is not user friendly.

Is there a way to fix this? Or can someone explain why almost all the devices are unknown or unsupported.

I am using a Mac. (Incase this matters)

UPDATE @François Beaufort
A screenshot of the nRF Connect app. In the app the device has a name. I just saw that the device had a name in bluetooth-internals too, but it seems like it doesn't advertise its name always.

And it says Device type: Google but it isn't a device from Google.

I am working with nrf52 and I made a custom service for 17 bytes data array and I want to send it but it gives fatal error while in data update (sending) function and resets the program.

Here's my custom service data update function:

We want Android to automatically connect to our custom made BLE peripheral.

Our peripheral should regularly (but infrequently) advertise and attempt to Indicate some time-sensitive sensor data to the phone. Thus we want the phone to be ready to connect at any time.

Generally, you can pair a smart watch with an Android, and Android will then automatically connect to the smart watch whenever it is in range. So we believe our use case should be feasible.

I read a lot of answers that advise to set the "autoconnect" parameter to true when connecting. I have tried that and the reconnections don't persist through a reboot or even after disabling and re-enabling Bluetooth on Android. This answer by Brian says I should scan in the background, but Android made this unrealistic. If I use a foreground service, my users will hate the app. If I use a background service, I may miss the peripheral's attempts to connect during Android's Doze and the code becomes error prone.

Ideally, I want to do something like what Emil said in his answer here. Please read the follow up question and response.

However, we can't see our app through Android's Bluetooth settings. We can only connect to the peripheral and pair with it using our app (or nrf Connect). In desperation, I tried modifying the peripheral's advertising flags. Then I could see it in Android's Bluetooth settings. But when I try to pair using Android's settings, the attempt fails because the peripheral is not in "pairing mode".

We are building both the app and the peripheral, so we can change both. I want to know if our use case is possible and what we need to do to get it working. We are using the STM32WB for our peripheral.

I'm a bit new to the BLE environment, my code works just fine, buy I can't manage to get some sort of response,

I'll show you the code, and I'll tell you more about my objective

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.

We have a BLE device we are working on that outputs data via the device's name. The device is functioning properly and can be seen changing names properly using an app like nRF Connect. However, we are having a difficult time doing the same in our own Android app. We can detect the devices fine, but they will almost never move past the original names they were given.

The code I started with has a loop that is started in onResume() that scans using a BluetoothLeScanner and the startScan() function.

I'm using the Flutter Blue library to build an app to connect to an IoT device. I was able to get the connection and the discovery of services to work.

I want to send a command which is originally written in Java (NRF library).

My setup is as follows:

1. BLE Peripheral in Raspberry Pi 3
2. nRF tool in Android Phone
3. My App in the same Android Phone (uses react-native-ble-manager)

When I connect to the Raspberry Pi using nRF tool, it connects successfully. But, when I connect using my own Android App it fails.

In the Raspberry Pi, I ran sudo btmon command to examine the failure log which is shown below:

I'm trying to understand how to encode some data for transfer over BLE (bluetooth low energy). Specifically, I'm interested in this particular line:

https://github.com/micropython/micropython/blob/05f95682e7ddfb08c317e83826df9a1d636676f3/ports/nrf/examples/ubluepy_temp.py#L68

Which comes from the snippet: