how can i get the number BLE TX re transmissions

[ziv123]

hello Nordic

i am working with nrf52832 and nrf52840 socs, with ncs v2.1.0

i would like to know how many of the BLE packets i am sending has to be resent (and if it is possible to know the reason of resent, in case there is another reason beside packet missed some bytes/bits on the OTA way, that would be great as well ) 

any idea how can i get that info ?

also another question, if i move (with BLE 4.2 and above) to extended length packets, to increase throughput, should there be more resent packets since the risk of loosing data in a larger packet is greater ?

hope to read you soon

best regards

Ziv

[ziv123]

Hi Sigurd

i'll close this topic after this last question 

Sigurd said:

I don't understand this question.

what i am asking is what can i learn from the information about the channel number (which probably change every few connection events or something like that) in the connection event report ?

(that is when i look at a complete connection session that is composed from many connection events) 

Sigurd said:

We have recently added a new feature on the main branch. https://github.com/nrfconnect/sdk-nrfxlib/blob/main/softdevice_controller/CHANGELOG.rst#id317 that gives you channel_energy.

same question as for what i can learn about the environment, interference, etc. where my central and peripheral are set from channel energy?

(or is it something that suppose to help the central pick specific channels for the hopping map ? )

hope to read you soon

best regards

Ziv

[Sigurd]

Hi,

ziv123 said:

(or is it something that suppose to help the central pick specific channels for the hopping map ? )

Correct. E.g. if you see that retransmits happening on only certain channels, or that the channel energy is very high on certain channels, the central can use that that information, and call bt_le_set_chan_map() to set a channel map to avoid those channels.