Sending multiple notify packets per connection interval

[Neil_CPD]

Hi,

Device: NRF53

I'm trying to send 3 notify packets in a 15ms connection internal but I can send 2.

I'm using Nrf connect and Zephyr.  is there a limit or a define to set this.

Thank you for any guidance and help

Regards

[Neil_CPD]

Thanks for doing this testing.  My peripheral is an nrf53,  would it be possible to swap the roles of your test and make the peripheral a nrf53 please?

I have two nrf53 so I'll try that this end.

Thanks

[Neil_CPD]

Hi Simon,

I've tested with the nrf53 uart peripheral example and a phone and I'm also able to send 3 packets.  I now need to see why my project can't.

Thanks for your help.

Neil

[Simon]

Sounds good. Please let me know if you don't figure it out.

[Neil_CPD]

Hi Simon,

I've modified the uart example to send 3 notifies but I have to sleep for 30ms in the thread to enable this to happen,  I'm targeting my system to send 3 notifies in every connection event. If I reduce this time it reverts to two notifies per connection event.

What is the limiting factor?  Thanks in advance.

Neil

[Simon]

Hello.

Sorry for the delay on this.

I talked to a colleague about this and got some insight on what may be the cause

How many packets you can send each connection event depends on how big the buffers are, both in host and LL. You can look at the configs of the ATT throughput example.

I tried to increase CONFIG_BT_BUF_ACL_TX_COUNT, CONFIG_BT_L2CAP_TX_BUF_COUNT and CONFIG_BT_CONN_TX_MAX, without any luck. I will continue to investigate tomorrow.

Best regards,

Simon