I was using the showcase app to record acceleration and gyroscope signals at the same time (using a single sensor) with a frequency of 208 Hz for both.
I am loosing data when using an iphone SE and the timestamps are lo longer ordered. (I am providing the output I am getting from the showcase app for the acceleration signal. The same errors are present in the gyroscope signal.)
When I used a lower sampling frequency of 104 Hz and the iphone SE, the timestamps are ok.
When I used an iphone X or an iphone 8 there is no problem at 208 Hz.
What do you think? It seems to be related to the BLE of the phone and not to the app as it works fine with iphone X