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Power down feature of the BLE Mesh

Hi, There. I am preparing to program a Mesh application based on nrf52840. The application supports the recovery from the points of power off.

So, I have a question. It will storage all info on the power-off point? ANd it will resume from the point, like intermittent computing?

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Amanda Hsieh over 4 years ago +1 verified

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…

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+1 Amanda Hsieh over 4 years ago

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.

It will storage all info on the power-off point?

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
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+1 Amanda Hsieh over 4 years ago

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.

It will storage all info on the power-off point?

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
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0 lgs over 4 years ago in reply to Amanda Hsieh

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.
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0 Amanda Hsieh over 4 years ago in reply to lgs

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.
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0 lgs over 4 years ago in reply to Amanda Hsieh

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
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0 Amanda Hsieh over 4 years ago in reply to lgs

Hi,

lgs said:
1. Can it store the packets that send it again?

No, see the previous answer.

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

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

-Amanda
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0 lgs over 4 years ago in reply to Amanda Hsieh

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.
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