BLE Stability over time

[Albin]

Hello,

We made a custorm project using the nrf52832-ciaa-r. We made some range test and we noticed that the more we wait connected before doing the range test, the further we go. 

Is there such behaviour coded in the softdevice ? Is the peripheral has an interlignet way of adapting to the central or the other way around ?

Thank you.

[Simonr]

Hi

This sounds very strange to me. Can you provide some more details on how long you wait after you have connected and how much the range increases? You say one device is the nRF52832, but what is the other device? A phone, another nRF52 device/DK?

The only thing I can think of increasing the range during a connection is a PHY and connection parameter update, but this usually is done as soon as the devices connect and agree on the best connection parameters and PHY. And the nRF52832 doesn't even support the BLE long range features, so the range increase shouldn't be very noticeable.

Best regards,

Simon

[hmolesworth]

"the more we wait" - out of interest, does the physical orientation or height above ground or relative planes change as the two BLE radios (antennas) are moved apart?

[Albin]

No we try to keep the same parameters every time we to a range test

[Albin]

Hello,

the difference is when we wait a few minutes or not before doing the range test.

The other device is also a NRF52832 we update the PHY parameters after 5s from 40ms connection interval to 300ms.

I also don't understant why waiting would change anything but i wanted to be sure

[Simonr]

How much is the difference in the range if you wait or not? Could be that you have another device running on the 2.4GHz band that causes some interference at first, but that would mean it also only is active at the beginning of your tests. It's hard to explain without more details I must say

Best regards,

Simon