U1: a tag's addressString (Modicon / mnemonic / DL205 V-memory / MELSEC
D-X-Y grammar) now resolves through ModbusAddressParser with the DRIVER's
Family and MelsecSubFamily at every initialize and is authoritative; the
family-unaware gates (deploy Inspect, AdminUI parse consult) accept what
some family resolves. The tag editor gets an address-text field that
resolves with the owning driver's family and persists both the string and
the resolved region/offset/type fields; a hand edit drops the string.
DisableFC23 now gates FC23: by default a 2..121-register holding write is
one FC23 write + read-back (a unit answering exception 01, or failing FC23 at
the transport, moves to FC16 for the rest of the generation); RTU framing
deframes the FC23 reply. Live-checked: the pymodbus fixture implements FC23.
Also: the AdminUI driver form serialises ModbusDriverOptions (TimeSpan
strings), which the factory DTO never read - every timing field on the form
was dead. The DTO now accepts both shapes (*Ms keys win).
Refs #741
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
H2: a Bad/null publish drops the deadband baseline and any status change
publishes, so a device that returns holding the identical value is no longer
swallowed by |new - old| < deadband (the #527 value-only-dedup trap).
Integration case drives a real drop/restore through a loopback relay.
Refs #741
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
P3: a torn-down socket is re-dialled inside the gate (one attempt per backoff
window) instead of failing fast with 'Transport not connected' until the 90 s
comms-loss watchdog re-initialised the driver.
L3: ConnectAsync disposes the previous/failed TcpClient, DNS runs under the
per-op timeout, and the reconnect never sleeps inside the gate (the old
10-attempt backoff held it for ~81 s).
H9: an MBAP response with no PDU, or an exception PDU with no code, is a
TruncatedFrame desync rather than an IndexOutOfRangeException.
Refs #741
Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
Joseph Doherty