gzll host frequency channels

[astella]

To the kind attention of Nordic support team,

I was wondering if it is mandatory that Host and Devices share the very same frequency table, with same size.

Is it possible to have an Host using F1 F2 F3 F4 F5 F6 and Device_A using F1 F2 F3 and Device_B using F4 F5 F6?

I'm asking, because I have been testing this scenario:

Device A host using frequency table F_T

Device B device using frequency table F_T

Device C device using frequency table F_T

C is transmitting in a loop without any particular timing constraint, C transmissions are successfully received in A

B is transmitting at the same time, B transmissions are successfully received in A for a while. B stops transmitting for ever. This doesn't affect C.

Maybe B transmission is stuck because of transmission queue is filled up.   

B is a very well tested device, that has not got its own transmission problem. Bug shows up only when C is transmitting.

So my Idea, was without entering too much in details, try to physically tell frequencies apart.

Thank you for your kindness

[Kenneth]

Hi,

Try to set nrf_gzll_set_sync_lifetime(0); on both devices. Though if you have one device that should be prioritized, then it can set nrf_gzll_set_sync_lifetime(100); for instance. But only one can use >0. Also I suggest to only use 3-5 channels.

Your approach may work, but then I would have tried:

Host - F1 F2 F3 F4 F5 F6
Device1 - F1 F1 F3 F3 F5 F5
Device2 - F2 F2 F4 F4 F6 F6

Best regards,
Kenneth

[astella]

Thank you Kenneth. I'll update with my test. Only one thing: when you are saying : 'Also I suggest to only use 3-5 channels.' you mean per Device? I don't think you are speaking about Host? Host table can be larger than 3-5 am I wrong?

Best regards

[Kenneth]

Hi,

You can use larger if you like, but typically having more than 3-5 doesn't really provide any benefit (it more likely increase latency). 

Kenneth