Power consumption in LPN with DFU enabled

[Mustafa]

Hello,

I'm trying to modify the Mesh light sample to be LPN node with DFU implemented but it seems that power consumption when I attach overlay-dfu.conf in the build goes very high from 6uA average to 507 uA average. What is the best way to reduce this current consumption?

Sceensheet when DFU is attached

the attached overlay dfu 

tools:

ncs: v2.2

board: nrf5240dk 

sample: light mesh 

[Edvin]

Hello,

What did the current consumption look like before you added the support for DFU? Did it have the same base current as you are seeing here? (the ~3mA)

Best regards,

Edvin

[Mustafa]

Hello Edvin,

without DFU looks fine 

[Edvin]

I see. I assume you have turned off e.g. logging in your LPN. However, it may be that this is turned back on in the bootloader. Try creating a file in:

light\child_image\mcuboot.conf

And disable the log from there by putting something like:

CONFIG_LOG=n
CONFIG_SERIAL=n

Does that help?

Best regards,

Edvin

[Mustafa]

Thanks, Edvin, it works now. but I notice now that the device advertises very frequently ( I think the adv interval is changed due to dfu service). is it possible to adjust the adv interval somewhere in the config files? 

[Edvin]

Please be aware that the DFU here is not a DFU over Bluetooth Mesh. It is DFU over BLE, so in order to update it, you need to connect to it via BLE, and then perform the update. Those are the advertisements that you are seeing. I think once a second is not that bad, but of course, you can adjust this. 

You can see in the smp_dfu.c file that it starts advertising with adv_params: .interval_min = BT_GAP_ADV_SLOW_INT_MIN and .interval_max = BT_GAP_ADV_SLOW_INT_MAX. You can change these if you like.

BR,
Edvin