RE: Secure DFU througput

Gili Elias — Thu, 11 May 2017 12:31:03 GMT

Yes. we are working with 6 packets per interval and it seems to be pretty consistent during the transfer.

I increased the buffer size to 4KB, so we only get flash writes at the end of each data object. I do see some lack of data transfer (for about 600ms) between the flash write and the time the EXECUTE is handled.

The CRC and EXECUTE commands are sent immediately after the last packet of the object.

Any idea what can cause such delay?

RE: Secure DFU througput

Vidar Berg — Thu, 11 May 2017 11:54:21 GMT

Hi,

We are looking to improve the buffer handling as it has been limiting the throughput in some cases, but I'm not sure if it has been a limiting factor for updates with Bluetooth as transport.

Have you changed the bandwidth configuration in the softdevice at both sides to ensure that as many packets as possible are sent on each connection interval (BW configuration is explained in SD migration document)?

Shorter connection intervals make it harder to schedule flash operations via the softdevice stack so you might have to make it a bit longer if you increase the BW.