Joseph Doherty cd19022d19 Phase 3 PR 45 -- DL205 string byte-order quirk (low-byte-first ASCII packing). Adds ModbusStringByteOrder enum {HighByteFirst, LowByteFirst} + StringByteOrder field on ModbusTagDefinition (default HighByteFirst, the standard Modbus convention). DecodeRegister + EncodeRegister String branches now respect per-tag byte order. Under LowByteFirst each register packs the first char in the low byte instead of the high byte -- the AutomationDirect DirectLOGIC DL205/DL260/DL350 family's headline string quirk. Without the flag the driver decodes 'eHllo' garbage from HR[1040..1042] even though wire bytes are identical. Unit tests: String_LowByteFirst_decodes_DL205_packed_Hello (5 chars across 3 regs with nul pad), String_LowByteFirst_decode_truncates_at_first_nul, String_LowByteFirst_encode_round_trips_with_decode (asserts exact DL205-documented byte sequence {0x65,0x48,0x6C,0x6C,0x00,0x6F} + symmetric encode->decode), String_HighByteFirst_and_LowByteFirst_differ_on_same_wire (control: same wire, different flag => different decode). 56/56 Modbus.Tests pass. Integration test: DL205StringQuirkTests.DL205_string_low_byte_first_decodes_Hello_from_HR1040 against the dl205.json pymodbus profile; reads HR[1040..1042] with both flags on the same tag map and asserts LowByteFirst='Hello' + HighByteFirst!='Hello'. Gated on MODBUS_SIM_PROFILE=dl205 since the standard profile doesn't seed HR[1040..1042]. Verified 2/2 integration tests pass against running pymodbus dl205 simulator. Baseline for PR 46 (BCD decoder), PR 47 (V-memory octal helper), PR 48 (CDAB float order), PR 49 (FC03/FC16 per-device caps) -- each lands its own DL205_<behavior> test class in tests/.../DL205/.

2026-04-18 21:43:32 -04:00

..

DL205

Phase 3 PR 45 -- DL205 string byte-order quirk (low-byte-first ASCII packing). Adds ModbusStringByteOrder enum {HighByteFirst, LowByteFirst} + StringByteOrder field on ModbusTagDefinition (default HighByteFirst, the standard Modbus convention). DecodeRegister + EncodeRegister String branches now respect per-tag byte order. Under LowByteFirst each register packs the first char in the low byte instead of the high byte -- the AutomationDirect DirectLOGIC DL205/DL260/DL350 family's headline string quirk. Without the flag the driver decodes 'eHllo' garbage from HR[1040..1042] even though wire bytes are identical. Unit tests: String_LowByteFirst_decodes_DL205_packed_Hello (5 chars across 3 regs with nul pad), String_LowByteFirst_decode_truncates_at_first_nul, String_LowByteFirst_encode_round_trips_with_decode (asserts exact DL205-documented byte sequence {0x65,0x48,0x6C,0x6C,0x00,0x6F} + symmetric encode->decode), String_HighByteFirst_and_LowByteFirst_differ_on_same_wire (control: same wire, different flag => different decode). 56/56 Modbus.Tests pass. Integration test: DL205StringQuirkTests.DL205_string_low_byte_first_decodes_Hello_from_HR1040 against the dl205.json pymodbus profile; reads HR[1040..1042] with both flags on the same tag map and asserts LowByteFirst='Hello' + HighByteFirst!='Hello'. Gated on MODBUS_SIM_PROFILE=dl205 since the standard profile doesn't seed HR[1040..1042]. Verified 2/2 integration tests pass against running pymodbus dl205 simulator. Baseline for PR 46 (BCD decoder), PR 47 (V-memory octal helper), PR 48 (CDAB float order), PR 49 (FC03/FC16 per-device caps) -- each lands its own DL205_<behavior> test class in tests/.../DL205/.

2026-04-18 21:43:32 -04:00

Pymodbus

Phase 3 PR 43 — followup commit: validate pymodbus simulator end-to-end + fix three real bugs surfaced by running it. winget-installed Python 3.12.10 + pip-installed pymodbus[simulator]==3.13.0 on the dev box; both profiles boot cleanly, the integration-suite smoke test passes against either profile.

2026-04-18 21:14:02 -04:00

ModbusSimulatorFixture.cs

Phase 3 PR 43 — followup commit: validate pymodbus simulator end-to-end + fix three real bugs surfaced by running it. winget-installed Python 3.12.10 + pip-installed pymodbus[simulator]==3.13.0 on the dev box; both profiles boot cleanly, the integration-suite smoke test passes against either profile.

2026-04-18 21:14:02 -04:00

ZB.MOM.WW.OtOpcUa.Driver.Modbus.IntegrationTests.csproj

Phase 3 PR 43 — Swap ModbusPal to pymodbus for the integration-test simulator. Replaces the .xmpp profiles shipped in PR 42 with pymodbus 3.13.0 ModbusSimulatorServer JSON configs in tests/ZB.MOM.WW.OtOpcUa.Driver.Modbus.IntegrationTests/Pymodbus/. Substantive reasons for the swap (rationale block in the test-plan doc): ModbusPal 1.6b is abandoned (last release ~2019), Java GUI-only with no headless mode in the official JAR, and only exposes 2 of the 4 standard Modbus tables (holding_registers + coils — no input_registers, no discrete_inputs). pymodbus is current stable, pure Python CLI (pip install pymodbus[simulator]==3.13.0), exposes all four tables, has built-in declarative actions (increment / random / timestamp / uptime) for dynamic registers, supports custom Python actions for anything more complex, and ships an optional aiohttp-based web UI / REST API for live inspection. Pip-installable on Windows; sidesteps the privileged-port admin requirement by defaulting to TCP 5020.

2026-04-18 20:35:26 -04:00