Hi,
I'm using nRF52840. I would use data length extension and set the MTU size to 247 when it works as peripheral. However,there would be some problem when it connect to the phone which just support bluetooth 4. So how to match bluetooth 4 when using data length extension to conect to the bluetooth 4 mobile phone? Thanks.
Besides, when there are large data to send, I would rather use 2M data rate. When the distance is long, I rather use LE code PHy data rate. However, how could I detect device has been far away from the center and then change to use LE code PHy data rate? Thanks.