How to use gzp for one nRF24 Dongle to pair two nRF52

[Chaw]

Hi, Nordic Now, I have one nRF24 Dongle, two nRF52 devices.

two nRF52 devices will send data to nRF24 via ESB(gzll), but need to pair.

Can two nRF52 devices can pair to same one nRF24 Dongle?

If yes, how to set?

[Hung Bui]

Hi Chaw,

Unfortunately, Gazell pairing library only support one encrypted pipe.

If you can use gzp but with no encryption then it's ok to have more than one device. Otherwise you would need to implement your own pairing library and base your protocol on normal gazell/ESB.

[Chaw]

Thanks. Could you share how to disable gzp encryption for nRF52 and nRF24?

And I check SDK example, nRF52 gzp Device use encryption, where can I find gzp demo with no encryption?

[Hung Bui]

In our gzp example, for example gzll_dynamic_pairing, we do show both type, sending crypt data and sending uncrypted data on UNENCRYPTED_DATA_PIPE. By design pipe 2-8 can be used as UNENCRYPTED_DATA_PIPE.

Using gzp without encryption is no better than using gzll, you can think of using gzll directly.

[Chaw]

my app scenirao is that I want to add gzll_pairing, my product maybe very many same devices(nRF52 and nRF24), if only gzll, it can be not good.

So I need that: first, gzll_dynamic_pairing working, then transfer data via uncrypted data on UNENCRYPTED_DATA_PIPE, is that possible?

[Hung Bui]

Hi Chaw,

Yes, you are correct, I was thinking on security point of view. But if you want to use pairing as to do the dynamic configuration such as exchange system address, frequency hopping table, then it's a good idea to use gzll_dynamic_pairing then transfer data via unencrypted pipes (note that each device would need one unencrypted pipe to be able to communicate concurrently. )