Closes the docs/e2e end of the Modbus addressing line shipped across
#136-#145.
Docs:
- docs/v2/modbus-addressing.md (new) — full grammar reference.
Region+offset (Modicon 5-digit / 6-digit / mnemonic), bit suffix,
type codes (BOOL / I / UI / DI / UDI / LI / ULI / F / D / BCD / LBCD /
STR<n>), all four byte-order mnemonics (ABCD / CDAB / BADC / DCBA),
array-count semantics, family-native syntax (DL205 V/Y/C/X/SP and
MELSEC D/M/X/Y with hex-vs-octal sub-family selection), driver-instance
options (KeepAlive / Reconnect / IdleDisconnect, MaxCoilsPerRead and
FC15/16 forcing, Deadband + WriteOnChangeOnly, MaxReadGap +
CoalesceProhibited, multi-unit IPerCallHostResolver). Includes a worked
JSON DTO example mixing AddressString + structured tag forms.
- docs/Driver.Modbus.Cli.md — appended a "v2 addressing grammar" section
pointing users at the full reference, with quick-reference examples.
- Vendor-compatibility caveat documented: type codes and byte-order
mnemonics were synthesised from training-era vendor docs (Wonderware
DASMBTCP, Kepware KEPServerEX, Ignition, Matrikon, OAS) and should be
verified against current vendor manuals before locking for production.
E2E tests (4 new AddressingGrammarTests in IntegrationTests):
- Modicon 5-digit and 6-digit forms map to identical wire offsets.
- Float32 + WordSwap (CDAB) round-trips end-to-end through the
pymodbus simulator.
- Int16[5] array round-trips as a typed short[] surface.
- Block-read coalescing produces a wire-acceptable PDU when MaxReadGap=5
bridges three nearby tags.
All tests skip gracefully when the pymodbus simulator at localhost:5020
is unreachable (matches the existing ModbusSimulatorFixture pattern).
Final test count across the Modbus addressing surface:
- 107 ModbusAddressing.Tests (parser + family + Modicon)
- 231 Driver.Modbus.Tests (driver, byte order, array, multi-unit, coalescing,
protocol, subscribe, connection options)
- 110 Admin.Tests (incl. ModbusOptionsViewModel defaults pinning)
- 4 new AddressingGrammar integration tests (skip when sim down)
