BLE: Fix privacy and signing handling in Security Manager

[paul-szczepanek-arm]

Summary of changes

This fixes handling of identity addresses when privacy is enabled by the ble security manager. A new call allows to retrieve peer identity address and local data is being stored in the db. It also fixes the initialisation of said identity address.

Impact of changes

Migration actions required

Documentation

none

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Pull request type

[] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[x] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[] No Tests required for this change (E.g docs only update)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

@pan-

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[ciarmcom]

@paul-szczepanek-arm, thank you for your changes.
@pan- @ARMmbed/mbed-os-pan @ARMmbed/mbed-os-maintainers please review.

[pan-]

That is confusing, I review these changes in #13038. Anyway all good except it may not be the best thing to write the local sign counter whenever it is changed.

[paul-szczepanek-arm]

That is confusing, I review these changes in #13038. Anyway all good except it may not be the best thing to write the local sign counter whenever it is changed.

I agree, it is not and I am not:
7441efa

[AGlass0fMilk]

So, before this, enabling privacy did not actually change the advertised address of the device? What I was seeing in the past was the device would advertise that it was using a random resolvable address but it always had the same MAC address. This was causing pairing issues with non-Mbed-OS devices (ie: iOS and Android)

[0xc0170]

add local idenitty and and csrk to security database

`idenitty type in the first commit. Otherwise looks fine to me. I would add also this

This fixes handling of identity addresses when privacy is enabled by the ble security manager. A new call allows to retrieve peer identity address and local data is being stored in the db. It also fixes the initialisation of said identity address.

to the first commit.

[paul-szczepanek-arm]

I have broken up commits into logical steps and expanded the commit messages

[0xc0170]

Sorry for the delay in all these BLE fixes, all should get CI time today.

[0xc0170]

CI started

[mbed-ci]

Test run: SUCCESS

Summary: 6 of 6 test jobs passed
Build number : 1
Build artifacts

[0xc0170]

All green but the incorrect status reported from mergify makes it red. I'll merge as it can't be overwritten.