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How to solve slow Bluetooth RFCOMM rates on current tablets

Android Slow Bluetooth RFCOMM Transfer Rate with RN4678 - Stack Overflow

It seems like almost all newer tablets have this problem. We previously used the Lenovo M10 Plus FHD 2nd Gen which did not have this problem. We are trying to switch to the Samsung Galaxy Tab A8. I don't believe this is due to interference despite the answers on Stack Overflow (considering the old Lenovo tablet worked fine). I tried things like adjusting the buffer size and changing the interval of the keep-alive command, but it didn't have much of an effect.

BTW, this isn't file transferring, but reading live data from two load cells connected to a board via Bluetooth (Classic, not BLE).
 
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