Sending multiple notify packets per connection interval

Question

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

Hung Bui · Accepted Answer

Hi Neil, 
 Attached you can find my example of sending 25 notifications in a 15ms interval connection. 
 It's not the maximum limit I believe. If you increase CONFIG_BT_CONN_TX_MAX you should have more but the CONFIG_BT_CTLR_RX_BUFFERS is limited to 18. I found that what slowing down the rate in the original centralhr example was the printk inside notify_func() that causing the central to NACK the packet from the peripheral. 
 In my test with my Galaxy S10 it achieved similar number of packets. 
 Please try the example I provided here and if it works please follow the configuration in my projects. 
 3264.hr_mp.zip 
 4745.sniffertrace2.pcapng

Sending multiple notify packets per connection interval

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