Number of BLE frames per connection interval - nrf52832

[Donal]

Hi There,

Is it possible to modify the number of BLE frames per connection interval (CI)? We are using nrf52832s and are only seeing one master request and slave response per CI. We have tried changing the duration of the CI, but this has no effect. The window size remains at 6.25ms.

You can see this in the following Wireshark trace. The CI is set to 800ms, the central sends a read request to the peripheral, but the peripheral does not respond until the following CI.

The following is our test setup:

• BLE Sniffer v1.0.1, using the nRF usb dongle
• Peripheral - nrf52832 dev board running the template application with the CI changed to 800ms, and a basic service added.
• Central - nrf52832 dev board controlled via the nrf Connect application.
• SoftDevice: s132_nrf52_3.0.0_softdevice.hex
• SDK: nRF5_SDK_12.1.0_0d23e2a

Also, why is the response to the read request not being sent back to the master in the CI which it was received?

Cheers

[Petter Myhre]

Please have a look at this.

You should use write commands or notifications if you want more packets per connection interval.

DLE and longer ATT MTU size may also be of interest.

[Donal]

Thank you for your help!