This commit updates `tests/unit/test_seeker.cpp` to use `ot::Array`
instead of C-style arrays with initializer lists for passing expected
selection orders in `CheckSelection()`.
The previous approach of passing initializer lists to a function
expecting a reference to a constant array caused compilation issues
on certain toolchains due to template deduction rules or temporary
object handling. By explicitly populating an `ot::Array` and passing
it, the test code becomes more portable and robust across different
compilers.
This commit introduces the `ScanResult` class, which inherits from
`otActiveScanResult`. This new class provides C++ idiomatic getter
methods that return core OpenThread types (e.g., `ExtAddress`,
`ExtendedPanId`, `NetworkName`) instead of raw C structures.
The logic for parsing a received Beacon frame and populating the
result fields is moved into `ScanResult::PopulateFromBeacon()`.
This centralizes the parsing logic and allows it to be reused
across different modules.
Consequently, `Mac`, `DiscoverScanner`, `Seeker`, and
`PanIdQueryServer` are updated to utilize `ScanResult`. The `Mac`
class is also updated to use the `Callback` template for the active
scan handler, replacing the previous raw function pointer and context.
This commit updates `Seeker` to use `MessageBackedArray` for storing
discovered candidates. This moves candidate storage from statically
allocated RAM in the `Seeker` instance to a `Message` buffer,
reducing the resident memory footprint.
The connection logic is enhanced to prioritize network diversity. The
`Seeker` now attempts to connect to the most favored candidate of
each unique network (Extended PAN ID) first. After exhausting unique
networks, it proceeds to remaining backup candidates. This improves
the likelihood of finding the correct network quickly in multi-network
environments.
The candidate storage policy is updated to limit entries per network
(defined by `kMaxCandidatesPerNetwork`). When storage is full, the
`Seeker` evicts a redundant entry from a well-represented network to
accommodate new network discoveries.
A detailed unit test `test_seeker` is included to validate candidate
tracking and selection order under various scenarios.
Abtin Keshavarzian