What's the maximum speed to send a packet?

[Chester]

Dear all

I'm using NRF51822 & 24LU1, I've tested to set timeslot to 500us.

For packet diagram, it should be reach to 2k packets per sec. but it only be the 200 packets per sec.

Q1 If i put full payload(32 bytes),how quickly can i send a packet? Q2 Is there any wrong with spec? It shows nrf_gzll_set_timelost_period(uint32_t period_us) Is the variable period_us really mean micro sec?

[Hung Bui]

Hi Chester,

200 packets per second is quite low. By theory with 500us timeslot you should have around 1000 packet per sec. The reason is that if there is 2 timeslot per channel, the second timeslot is used for re-transmission. So you will not have more than 1 packet on every channel (RX_PERIOD on the host).

Usually, we measured around 800 packets per sec.

In addition, 500us is not optimized, since the LFCLK on the LU1 is 32000kHz, there would me some small drift in communication with nRF51 (run on 32768kHz). Our suggestion is to set the RX_PERIOD on LU1 to 1008us and set the timeslot on nRF51 to 504 us.

Secondly, your data rate should be 2Mbps to use the 504us timeslot and the packet size should be around 20 bytes maximum.

[Chester]

I used 51822 SDK gzp_device_dynamic_pairing with 24lu1 SDK gzll_host_w_dynamic_pairing. Should I do anything modified to reach 800 packets/sec? If you can upload sample code, I'll appreciate for your kindness.