How to send ECG data from nrf5340 BLE at every 5ms

[Vivek]

We are using nrf5340 with MAXIM AFE that gives the ECG data at 200 Hz. We want to send that data via BLE to the phone app so that a graph can be plotted and analysed. 

Shall we send the data every 5ms via BLE or store the readings and send at a less frequency?

The ECG works for 3 minutes at a time.

[Karl Ylvisaker]

Hello,

The shortest connection interval in BLE is 7.5 ms, so you will have to buffer up some measurements before sending either way.
How many samples you choose to buffer inbetween each BLE transfer will depend on the latency requirements of your application, as well as the size of each measurement.

Best regards,
Karl