Amount of flash memory required by OpenThread for dataset

[ValNyrov]

Hi all!

I'm new and just learning. Tell me, what is the exact amount of flash memory required by OpenThread to store the configuration (for Operational Datasets, maybe for something else)? Where can I read about it?

BR,
Valeriy

[jwhui]

The Thread Conformance Specification states that the maximum size for Operational Datasets is 254 bytes. In OpenThread, this is reflected at:

openthread/include/openthread/dataset.h

Line 254 in 0f10480

#define OT_OPERATIONAL_DATASET_MAX_LENGTH 254

OpenThread stores non-volatile information using the otPlatSettings*() interface. The OT_SETTINGS_KEY_* enum identifies the set of items that OpenThread stores in non-volatile. The amount of non-volatile storage needed will depend on various build configurations (e.g. child table size, use of SRP client, etc.).

[ValNyrov]

Thanks for the help!
What is the maximum size of the child/router ID table?
BR,
Valeriy

[jwhui]

Thread Protocol supports up to 511 children per router. OpenThread has a build-time configuration:

openthread/src/core/config/mle.h

Line 58 in cba1beb

#define OPENTHREAD_CONFIG_MLE_MAX_CHILDREN 10

Thread Protocol has 63 valid router IDs, but only 32 may be active at a given time.

[ValNyrov]

Thanks!