Expected PER while using DTM and 2 nRF-dev boards

[user123]

Hi

I'm preparing for some tests and I'm wondering where I can find information about what the expected percentage error rate should be?

Right now with 2 nrf boards connected I get around 0-1% PER while testing every channel.

[endnode]

And this is correct until you go down to -30/-40dBm Tx Power or start to shield/obstruct some unit (or move it dozens meters away). Note that if you are using Nordic examples (Python script) you have already several packets as systematic error so depedning on your statistic you can have 100% reliable link but still report 1-5% PER (note that DTM only reports number of received packets on Rx side but not number of issued packets on Tx side, that's done by timing and if you are using slow UART and some other middleware - such as any PC with serial driver and OS running - then you are way in millisecond range of delays/inaccuracy while DTM packets are using 0.625ms timing).

[user123]

I see ! Well what I actually want to do is a blocking test. So I want to send x amount of bytes and see how many bytes are lost.