# Validation and online-change qualification

Release versions: IEC library **0.8.0.0**, C component **0.5.0.0**. The external
ABI signature/API version is unchanged.

Host validation completed:

- Strict synchronous C build and bridge capacity/pool/handle/shutdown tests.
- Direct and bridge TCP normal, fragmented, timeout, protocol-error, exception,
  write and reconnect scenarios.
- RTU pseudo-terminal frame, CRC, timeout, exception, register/coil write and
  recovery scenarios.
- TCP slave function-code, exception, address and bind-recovery scenarios.
- XML export parsing, object references, collection metadata and removal of the
  threaded Worker object.
- C client `FB_reinit` closes its native context before clearing IEC pointers;
  slave `FB_reinit` closes its listener before clearing its handle.

Required on each target before production:

- Rebuild for the exact CPU/toolchain and verify ELF/GLIBC compatibility.
- Compile/import the export in CODESYS and embed the matching C component.
- Test online change while idle, during an active read, during disconnect and
  during an active write.
- Verify contexts reopen, request pointers are rebuilt, data becomes valid, and
  no stale socket/listener remains after repeated online changes.

Physical target, prolonged soak, and CODESYS IDE qualification were not available
in the host environment. Keep the previous threaded release as rollback only.