NRF52840 Thread example power down 10 mins after USB disconnect

[meetandyhere]

Hello,

I am trying the Thread Cloud COAP Client

<InstallFolder>\examples\thread\experimental\cloud_coap_client

on a NRF52840 PDK. I'm using Thread SDK v0.10.0. The example works as described.

However, when I unplug the board from USB, it goes into some kind of power down mode in approx. 10 minutes and loses connection to the Thread network. I can see LED1 is still on, but it is extremely faint. It is flickering, so trying to connect to the network, but it cannot do so. After a further 5-6 minutes of this, LED1 goes completely off.

I had a few questions about this behaviour:

1. Where in the code can I set the time between USB disconnect and going in power-down mode?
2. I know that the NRF52840 has System ON and System OFF power modes. Where in the code can I set which mode it should go in?
3. Is the behaviour of it not being able to connect to the Thread network when in low power mode expected? If so, can I change this behaviour or is there a fix planned?

Thanks in advance!

Regards

Andy

[meetandyhere]

Yes, I am using the same battery for every test. If the board is connected to USB, it works uninterrupted without any power down. Is the power consumption of Thread examples quantified? We are interested in using Thread for further development, but a big constraint for us is that battery consumption should be minimal. Our use-case is a door sensor which sends door open/close information when this status changes to a cloud application. The Thread Cloud CoAP client seems to be a straightforward solution, but maybe we have to rethink using Thread if it consumes too much power. Could you recommend a non-Thread example which can achieve the similar Client-Cloud functionality as the Thread example?