how is Gzp pair (nRF52 with nRF24) distance

[Chaw]

Hi, Nordic nRF52 as GZP Device, nRF24 as GZP Host

I know if nRF52 is range of nRF24, the pair will be worked.

I want to know what is the distance.

And if I use unencrypt, I only want to pair two nRF52, how to disable 3rd nRF52 Device?

Gazell can not operate pair, right?

[ovrebekk]

Hi

There is a proximity pairing feature in GZP whereby a pairing request will only be accepted if the signal strength is above a certain value. In the nRF24 hosts this is implemented using the Received Power Detect (RPD) bit, which kicks in when an incoming signal is stronger than -64dBm. Exactly what range this equals is hard to predict, and can change depending on environmental factors, the hardware used and so forth, but I would expect the pairing range to be less than 1m.

If you close the pairing pipe after two devices are connected you should be able to limit the host to only support those two.

I don't understand what you mean with "Gazell can not operate pair". Could you elaborate?

Best regards
Torbjørn

[ovrebekk]

You are correct. GZP is just an extra module that you can use on top of Gazell, but it is entirely optional. If you don't use GZP then Gazell will use a static address configuration, and you have to program the same address into both the device and the host. The other important feature in GZP is the encryption, which is not covered by Gazell either.