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Data Rate Measurment

trk

Hello all. while trying to calculate the data rate from bluetooth low energy , i have two questions

  1. Is there a possibility to measure the data rate by using nrf sniffer? I tried using sniffer but in wireshark i found only advertisement packets.
  2. Then i tried master control pannel for calculating data rate., From the tests i have done these are the results For connection interval of 100 ms (i did min rate and max rate are same) i get 92 packets in the first trial and 100 packets in the second trail For connection interval of 50 ms (Min rate = Max rate ), i got 30 packets in first trail 25 packets in second trail 12 packets in third trail 31 packets in fourth trail 25 packets in fifth trail

Then i changed Min connection interval to ((X/2) * 1.25 ) and max connection interval to (x/2) * 2 here x is macro value when x=80 ; and writing interval is 10ms(writing interval is time interval where data is written to ble buffers in nordic) data rate is 60 packets , for x=80 and writing interval is 1ms then data rate is 300 packets for x= 40 and writing interval is 10 data rate is 120 packets, and for writing interval is 1 ms data rate is 250 packets.

There is no consistency when ever we are taking the reading. From this i want to know how many buffers are present in nordic ble and is there any way to calculate the data rate because in master control pannel the resolution is 100 ms. Thank you

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    Thank you for reply stefan, I tried calculating the data rate by setting writing interval to nrf51822 as 1ms and connection interval as 7.5 ms. As per calculation as pre assumed there are 7 buffers in nrf51822., i need to achieve (1000*7)/7.5 = 933 packets per second. but when i check with master control pannel i can recieve only 413 packets per second. Am i missing something? And i read in another forms as CPU will be blocked for 1.6 ms , if we write two buffers with writing interval of 1ms. and if we write seven buffers with writing interval of 1ms., CPU is blocked for 5.6ms. Is that correct? CPU blocking time source from s110softdevicespecification document v1.1 If CPU is blocked for 5.6ms writing seven buffers with writing interval of 1ms. I can able to write only two buffers i.e 2 packets per 7.5 ms., i.e 233 packets per second. But i can achieve 411 packets per second? Can i get answer to these questions? Thank you.

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    Thank you for reply stefan, I tried calculating the data rate by setting writing interval to nrf51822 as 1ms and connection interval as 7.5 ms. As per calculation as pre assumed there are 7 buffers in nrf51822., i need to achieve (1000*7)/7.5 = 933 packets per second. but when i check with master control pannel i can recieve only 413 packets per second. Am i missing something? And i read in another forms as CPU will be blocked for 1.6 ms , if we write two buffers with writing interval of 1ms. and if we write seven buffers with writing interval of 1ms., CPU is blocked for 5.6ms. Is that correct? CPU blocking time source from s110softdevicespecification document v1.1 If CPU is blocked for 5.6ms writing seven buffers with writing interval of 1ms. I can able to write only two buffers i.e 2 packets per 7.5 ms., i.e 233 packets per second. But i can achieve 411 packets per second? Can i get answer to these questions? Thank you.

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