12 lead ecg system using nRF52832 - huge data loss when phone shake.

[Abhinav Cardea]

Dear experts.. we are trying to build a 12 lead ecg system which sends real time data to mobile phone for plotting using nRF52832. While most of the time it works ok, when we vigorously shake the phone, a huge data loss can be observed. the phone used here is Samsung with BLE 4.2.  I was wondering if that is a normal phenomenon? our sampling rate is 500 samples per second and roughly we are sending 11k byte per  sec.

[Abhinav Cardea]

The signal getting plotted as seen in the video/pic is the test signal generated by the front end ECG chip and is not ECG signal obtained when put on a real person. In addition, if you see the video, the phone is moving, not the device. I want to understand if sending 11k byte per sec is the problem here or could be something else? Is packet drop acceptable? if yes, then how much?