Power down feature of the BLE Mesh

RE: Power down feature of the BLE Mesh

lgs — Wed, 15 Sep 2021 05:00:15 GMT

I mean the reset button(SW5) and switch button(SW8) on nRF52840 DK.

RE: Power down feature of the BLE Mesh

lgs — Wed, 15 Sep 2021 04:57:19 GMT

Wait for me to upload it to github

RE: Power down feature of the BLE Mesh

Amanda Hsieh — Tue, 14 Sep 2021 08:39:38 GMT

Is it possible to share the project? I can make this case private if you want. Then, it will only share with Nordic.

RE: Power down feature of the BLE Mesh

lgs — Tue, 14 Sep 2021 08:33:21 GMT

Yeah, It is a nRF52840DK board.

RE: Power down feature of the BLE Mesh

Amanda Hsieh — Tue, 14 Sep 2021 06:43:51 GMT

Hi,

Not 100 % clear what you means, but I guess you get one type of behavior when pressing the reset button on the board, and another type of behavior when they turn the on/off switch off and on again? Which does sound a bit strange, if you ask me, as that should not really give a difference. Do you mean a soft reset from code?

What kind of memory problems are you having, and what board? Is it nRF52840DK or custom board? Is it possible reproduced on nRF52840DK?

-Amanda

RE: Power down feature of the BLE Mesh

lgs — Fri, 10 Sep 2021 08:58:55 GMT

Hi Amanda,

There is a difference between power-off/on and reset.

In Mesh beaconing example, when the transmission count gets to 100, I use the advertiser_disable() function to stop it. I reset the boards, it runs normally. But, when I try to turn-off/on, it will appear some memory problems.

So, I am confused about it.

RE: Power down feature of the BLE Mesh

Amanda Hsieh — Thu, 09 Sep 2021 10:53:40 GMT

Hi,

[quote user="lgs"]1. Can it store the packets that send it again? [/quote]

No, see the previous answer.

[quote user="lgs"]2. What's the difference between power off then on and reset?[/quote]

For recovery of netkey, devkey, appkey, IV Index, it is the same.

-Amanda

RE: Power down feature of the BLE Mesh

lgs — Thu, 09 Sep 2021 08:55:26 GMT

Hi Amanda,

1. Can it store the packets that send it again?

2. What's the difference between power off then on and reset?

Kind regards,

Gaosheng

RE: Power down feature of the BLE Mesh

Amanda Hsieh — Tue, 10 Aug 2021 13:02:46 GMT

Hi,

No, that's not stored. It only stores enough information so that the device can join the network and communicate in the network again.

-Amanda H.

RE: Power down feature of the BLE Mesh

lgs — Tue, 10 Aug 2021 12:31:47 GMT

Hi,

thanks for the reply.

The "power-off" point means the device is powered off, the info means the program's execution progress, for example, before power off, the device prepares for sending a message. So, my question is that can it recover the "sending message" state(same as the state before power off) when power on again.

RE: Power down feature of the BLE Mesh

Amanda Hsieh — Tue, 10 Aug 2021 11:59:22 GMT

Hi,

All our examples can recover from a power reset. Except if you select PERSISTENT_STORAGE = 0.

It stores everything, netkey, devkey, appkey, IV Index. The sequence number is stored in a block. The reason is that if we store the sequence number every time it changes, it will wear out the flash, so we store the sequence number in the block, everytime you booting up, you use the next block.

[quote user=""]It will storage all info on the power-off point?[/quote]

What do you mean by the "power-off point"? Is it as I mentioned above we can recover from a power reset, soft reset, etc?

-Amanda H