deleteAllBonds() not properly cleaning up space in NVS

[finger563]

I've noticed (on esp-idf v5.2.1) that the ble_store_clear() doesn't work as expected - I still get too many bonded device errors even though every time i enter pairing mode I call NimBLEDevice::deleteAllBonds().

With logs enabled:

Originally posted by @finger563 in #5 (comment)

[h2zero]

That would be an upstream issue. Espressif probably changed something in the NimBLE code and broke it.

[finger563]

FWIW i've found that manually deleting the bonds 1-1 is a better approach for now, though it does sometimes actually return errors. Currently the NimBLEDevice::deleteAllBonds() does not return any error code (though it could since the underlying call does). Perhaps I'll make a PR for that to help track errors.

Some of my testing can be seen here:
esp-cpp/espp#225

[finger563]

Somewhat related, it can be useful to see the return code from the underlying ble_store_clear(), so I've made a PR: #158