I am using Web Bluetooth API to write to a characteristic of a PCB board. I am able to successfully write to the characteristic via Chrome on Windows laptop.
If i try the same code via Chrome on Android 10, I get a DOM Exception: GATT Error Unknown.
I am writing a Uint8Array of length 493. I tried writing the entire data and also in chunks of 10. In both cases, I am getting an error in Mobile device.
Can someone please help?
I am using Chrome browser version 91.
UPDATE: Added Code Snippet. I am calling a Python API to fetch data to be written to the characteristic and converting the data to Uint8Array. I tried to write the entire data via mobile but it wasn't working. Found this link which says to write data in chunks. So I tried that as well. Still same error.
UPDATE 2: I tried the methods writeValue and writeValueWithoutResponse. I am getting GATT server disconnected error. I tried this link to try to fix the same. But it still persists. I have attached the screenshot for the same. 
UPDATE 3:
I tried with adding an event listener. I tried the same code from laptop and mobile device. It works on laptop successfully and gives off error on mobile. I have attached screenshots for both laptop and mobile.
To get help you likely need to reduce the problem to simple code samples that you can share. Ideally these work with common devices that others can test too.
https://www.chromium.org/developers/how-tos/file-web-bluetooth-bugs includes tips on how to capture logs and test with other devices.