nrf52840 slow rx characteristic time

[_maibi]

The nRF52840 has a longer rx characteristic reception time than the nRF51822.

 --> android terminal log

first and second line nRF52840 , It takes almost 1.2 seconds to get the rx characteristic.

below nRF51822, It takes almost 0.4 seconds.

why It happens? What should I do to improve the performance?

NRF52840 -

SDK 15.3.0, with buttonless dfu service

NRF51822 - 

SDK 12.3.0 - w/o buttonless dfu service

Other application layer are almost same.

[Simonr]

Hi

You should measure from the first Empty PDU in the sniffer trace until the packet you want to compare in order to get the most reliable timing.

Best regards,

Simon