[Request] Add support for EphemeralKey (ePSK) #211
Description
Add support for EphemeralKey (ePSK) / 1.4 Credentials Sharing
https://openthread.io/reference/group/api-border-agent#otborderagentephemeralkeygeneratetap
White_Paper
Thread_1.4_Features_White_Paper_September_2024.pdf
Thread Credentials Sharing provides a secure and user-friendly way to grant temporary administrative access to an existing Thread network. This access allows for the extraction of the necessary network credentials, which can then be used to commission new Thread devices seamlessly. The process leverages a short-lived, single-use key called the Ephemeral Pre-Shared Key for the Commissioner (ePSKc), derived from a user-friendly Thread Administration One-Time Passcode, which is remarkably similar to the one-time numeric codes that users are already familiar with for login purposes.
This approach makes it as easy as possible for the user, while still meeting the strict security requirements of Thread. This feature can be compared to the "forgot my password" option that many websites offer today. The procedure described below only needs to be executed in exceptional cases where the Thread network credentials are unavailable to the user performing the onboarding of a new Thread device
NCP part