Sustained sub-second data rate frequency?

[bx]

Hi,

I'm having trouble increasing frequency of data TX using ble_app_hrs example on PCA10028.

I tried to increase the TX frequency of heartrate data to 100ms by configuring "#define HEART_RATE_MEAS_INTERVAL APP_TIMER_TICKS(100, APP_TIMER_PRESCALER)"

The data is coming through, but only for first 5 seconds is actually coming at the expected rate, then it goes down to about 600ms between packages received in nRF Connect App.

Other than changed #define this is a vanilla ble_app_hrs example from SDK 11.0. I tried to disable timers other than heartrate sim, and fiddled with advertising interval and timeout data, but couldn't improve data rate so far.

Any hints on how to reliably achieve sub-second data rates would be much appreciated.

Thanks,

Borut

[Petter Myhre]

I'm guessing that you see this decrease because of a Connection Parameter Update. The connection interval is increased. Please see this for information about connection parameters. For how to check what the actual connection interval is please see this.

[bx]

Thanks Petter! By setting MIN_CONNECTION_INTERVAL an MAX_CONNECTION_INTERVAL to 50ms and 100ms respectively I was able to achieve desired data rate.