Secure buttonless dfu very slow

RE: Secure buttonless dfu very slow

Vidar Berg — Thu, 02 May 2019 13:12:12 GMT

You will likely see higher throughput if you use a nRF52 or nRF connect on android/ios.

[quote userid="7065" url="~/f/nordic-q-a/46814/secure-buttonless-dfu-very-slow/184901"]Why nrf connect doesn't select lower connection interval always (NRF_DFU_BLE_MIN_CONN_INTERVAL is set to 6)?[/quote]

Probably to reduce power consumption. It doesn't necessarily reduce throughput when DLE/long MTU is supported

RE: Secure buttonless dfu very slow

gaminn — Thu, 02 May 2019 12:45:37 GMT

I use SDK 15.2 . I modified NRF_DFU_BLE_MAX_CONN_INTERVAL in sdk_config.h of the bootloader. I set it to 6 (instead of 40). Now I get full speed where it was 0.35 kB/s previously.

Why nrf connect doesn't select lower connection interval always (NRF_DFU_BLE_MIN_CONN_INTERVAL is set to 6)?

Anyway, I guess this is not big problem for us as normally we will use different host to perform dfu.

RE: Secure buttonless dfu very slow

Vidar Berg — Thu, 02 May 2019 12:34:59 GMT

Hi,

Which SDK version are you using? I suspect it's the connection interval that's different. PCA10031 will also lead to lower throughput if you are testing with SDK 15 since it doesn't support long MTU.

RE: Secure buttonless dfu very slow

gaminn — Thu, 02 May 2019 12:06:28 GMT

BLE connection to my app uses 20 ms connection interval - we can't go lower. Can this be the issue? If so, then I don't understand why the new connection established with the bootloader doesn't use lower value of the connection interval.