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.

[Simonr]

Hi

I don't know the specifics of your application, so it's hard to say what you should do to further lower the packet loss of your transmission or if it's even possible. First of all, you can try to set the scan interval and scan window equal to one another to ensure that the central is scanning continuously.

How many packets do you transmit per second, and how many percent (%) of the packets are successfully transmitted now? How is the environment you're testing in, is there a lot of other 2.4GHz interference that might cause some packet loss or not?

Best regards,
Simon