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Auto: s7-c2 — TSAP / Connection Type selector

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Closes #295
This commit is contained in:
Joseph Doherty
2026-04-26 00:49:10 -04:00
parent bcf83bf39b
commit 3b98e4d366
7 changed files with 513 additions and 1 deletions
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23
docs/Driver.S7.Cli.md
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@@ -22,6 +22,9 @@ dotnet run --project src/ZB.MOM.WW.OtOpcUa.Driver.S7.Cli -- --help
| `--rack` | `0` | Hardware rack (S7-400 distributed setups only) |
| `--slot` | `0` | CPU slot (S7-300 = 2, S7-400 = 2 or 3, S7-1200/1500 = 0) |
| `--timeout-ms` | `5000` | Per-operation timeout |
| `--tsap-mode` | `Auto` | ISO-on-TCP connection class: `Auto` / `Pg` / `Op` / `S7Basic` / `Other`. Hardened S7-1500 / ET 200SP CPUs may require `Op` or `S7Basic`. See [s7.md TSAP / Connection Type](v2/s7.md#tsap--connection-type). |
| `--local-tsap` | (unset) | Optional 16-bit local TSAP override (e.g. `0x0200`). Required when `--tsap-mode Other`; wins over class default under Pg/Op/S7Basic. |
| `--remote-tsap` | (unset) | Optional 16-bit remote TSAP override. Required when `--tsap-mode Other`; wins over class default under Pg/Op/S7Basic. |
| `--verbose` | off | Serilog debug output |
## PUT/GET must be enabled
@@ -83,6 +86,26 @@ otopcua-s7-cli write -h 192.168.1.30 -a M0.0 -t Bool -v true
**Writes to M / Q are real** — they drive the PLC program. Be careful what you
flip on a running machine.
### Hardened CPU — forcing OP-class TSAP
```powershell
# Probe a hardened S7-1500 that rejects PG class but accepts OP.
otopcua-s7-cli probe -h 10.50.12.30 --tsap-mode Op
# Read against the same CPU.
otopcua-s7-cli read -h 10.50.12.30 --tsap-mode Op -a DB1.DBW0 -t Int16
# Manual TSAP override (e.g. site with a fixed proprietary TSAP gateway).
otopcua-s7-cli probe -h 10.50.12.30 --tsap-mode Other --local-tsap 0x4D57 --remote-tsap 0x4D58
```
Without `--tsap-mode`, the CLI uses S7netplus's CpuType-derived default (PG
class for almost everything). The same connection-refused failure shape that a
wrong `--slot` produces also shows up when the CPU rejects PG class — try
`--tsap-mode Op` first when the handshake is failing on otherwise-correct
endpoint config. See [s7.md TSAP / Connection Type](v2/s7.md#tsap--connection-type)
for the byte table and motivation.
### `subscribe`
```powershell

80
docs/v2/s7.md
View File

@@ -573,6 +573,86 @@ S7 driver health without reaching for a Wireshark capture:
The values render alongside Modbus / OPC UA Client metrics in the Admin
UI driver-diagnostics panel — same RPC, same dashboard row layout.
## TSAP / Connection Type
S7comm runs on top of ISO-on-TCP (RFC 1006), and the COTP connection-request
PDU carries a 16-bit **TSAP pair** (local + remote) that the CPU validates
before any S7comm payload flows. S7netplus's default `Plc(CpuType, host, port,
rack, slot)` constructor picks a **PG-class** TSAP pair via
`TsapPair.GetDefaultTsapPair`. That choice works against most lab S7-1200 /
S7-1500 CPUs and against TIA Portal itself, but **hardened deployments**
(security-config'd S7-1500, ET 200SP, locked-down PROFINET projects) reject
PG class outright at COTP-handshake time, returning the same connection-refused
shape as a wrong slot byte.
PR-S7-C2 surfaces a `TsapMode` enum on `S7DriverOptions` so an operator can
force a specific class without re-flashing the PLC project. It applies equally
to the Admin-UI-driven config DB row and to the `otopcua-s7-cli` test client.
### Raw-TSAP byte table
The high byte is the connection class. The local low byte is conventionally
`0x00` (caller / unprivileged), and the remote low byte is
`(rack << 5) | slot` per the S7 spec — the same convention S7netplus's
`TsapPair.GetDefaultTsapPair(CpuType, rack, slot)` uses for the remote endpoint.
| Class | High byte | Local TSAP (rack=0/slot=0) | Remote TSAP (rack=0/slot=0) | Remote TSAP (rack=0/slot=2) | Typical use |
|----------|-----------|----------------------------|------------------------------|------------------------------|----------------------------------------------|
| PG | `0x01` | `0x0100` | `0x0100` | `0x0102` | TIA Portal, dev laptops, lab S7-1200/1500 |
| OP | `0x02` | `0x0200` | `0x0200` | `0x0202` | Operator panels, hardened-CPU S7-1500 |
| S7-Basic | `0x03` | `0x0300` | `0x0300` | `0x0302` | WinCC BasicPanel SDK, S7-Basic clients |
| Other | caller | caller-supplied | caller-supplied | caller-supplied | escape hatch — unusual fixed-TSAP firmware |
### `TsapMode` enum
| Mode | Behaviour |
|-----------|----------------------------------------------------------------------------------------------------------------------------------|
| `Auto` | Existing behaviour — S7netplus picks the TSAP pair from `CpuType`. Explicit `LocalTsap` / `RemoteTsap` are ignored under `Auto`. |
| `Pg` | Force PG class (high byte `0x01`). Local / remote computed from rack + slot. |
| `Op` | Force OP class (high byte `0x02`). |
| `S7Basic` | Force S7-Basic class (high byte `0x03`). |
| `Other` | Caller-supplied `LocalTsap` + `RemoteTsap`. Both must be set or driver init throws `InvalidOperationException`. |
Explicit `LocalTsap` / `RemoteTsap` overrides win over the class-derived
defaults under any non-`Auto` mode — a site that needs a fixed source-TSAP for
firewall reasons can pin `LocalTsap` while keeping `TsapMode = Pg` for the
remote computation.
### Worked example: hardened S7-1500 requiring OP class
```jsonc
{
"Host": "10.50.12.30",
"CpuType": "S71500",
"Rack": 0,
"Slot": 0,
"TsapMode": "Op",
"Tags": [ /* … */ ]
}
```
This produces local = `0x0200`, remote = `0x0200` (rack=0, slot=0). The same
PLC under `TsapMode = "Auto"` (PG class) returns COTP rejection — same packet
capture shape as a wrong-slot misconfig, which is the failure-mode footnote
under §5 of `driver-specs.md`.
### Why not just expose `LocalTsap` / `RemoteTsap` directly?
Most operators don't know the byte format off-hand and reach for `Pg` /
`Op` / `S7Basic` based on Siemens-doc terminology. Keeping the enum lets the
Admin UI render a dropdown with sensible labels, while the `ushort?` fields
stay available as the manual escape hatch when a site has truly unusual
firmware (e.g. third-party S7-protocol gateways with fixed proprietary
TSAPs). Both paths are exercised in the unit-test mapping table.
### Live-firmware verification
The PG/OP/S7-Basic byte table above is the documented Siemens convention; the
actual handshake is verified against the dev-box S7-1500 lab rig (a hardened
project that rejects PG and accepts OP). That test is documented in
`tests/ZB.MOM.WW.OtOpcUa.Driver.S7.IntegrationTests` but only runs against
real firmware — the pymodbus-style "TSAP simulator" doesn't exist for S7.
## References
1. Siemens Industry Online Support, *Modbus/TCP Communication between SIMATIC S7-1500 / S7-1200 and Modbus/TCP Controllers with Instructions `MB_CLIENT` and `MB_SERVER`*, Entry ID 102020340, V6 (Feb 2021). https://cache.industry.siemens.com/dl/files/340/102020340/att_118119/v6/net_modbus_tcp_s7-1500_s7-1200_en.pdf

20
src/ZB.MOM.WW.OtOpcUa.Driver.S7.Cli/S7CommandBase.cs
View File

@@ -33,6 +33,23 @@ public abstract class S7CommandBase : DriverCommandBase
[CommandOption("timeout-ms", Description = "Per-operation timeout in ms (default 5000).")]
public int TimeoutMs { get; init; } = 5000;
[CommandOption("tsap-mode", Description =
"ISO-on-TCP / S7comm connection class: Auto (default — S7netplus picks the TSAP " +
"from --cpu), Pg, Op, S7Basic, or Other (requires --local-tsap and --remote-tsap). " +
"Hardened S7-1500 / ET 200SP CPUs may refuse PG and require Op or S7Basic. See " +
"docs/v2/s7.md \"TSAP / Connection Type\" for the byte table and motivation.")]
public TsapMode TsapMode { get; init; } = TsapMode.Auto;
[CommandOption("local-tsap", Description =
"Optional 16-bit local TSAP override (e.g. 0x4D57). Required when --tsap-mode is Other; " +
"wins over the class default under Pg/Op/S7Basic.")]
public ushort? LocalTsap { get; init; }
[CommandOption("remote-tsap", Description =
"Optional 16-bit remote TSAP override. Required when --tsap-mode is Other; wins over " +
"the class default under Pg/Op/S7Basic.")]
public ushort? RemoteTsap { get; init; }
/// <inheritdoc />
public override TimeSpan Timeout
{
@@ -55,6 +72,9 @@ public abstract class S7CommandBase : DriverCommandBase
Timeout = Timeout,
Tags = tags,
Probe = new S7ProbeOptions { Enabled = false },
TsapMode = TsapMode,
LocalTsap = LocalTsap,
RemoteTsap = RemoteTsap,
};
protected string DriverInstanceId => $"s7-cli-{Host}:{Port}";

54
src/ZB.MOM.WW.OtOpcUa.Driver.S7/S7Driver.cs
View File

@@ -163,7 +163,7 @@ public sealed class S7Driver(S7DriverOptions options, string driverInstanceId)
_parsedByName[t.Name] = parsed;
}
var plc = new Plc(_options.CpuType, _options.Host, _options.Port, _options.Rack, _options.Slot);
var plc = BuildPlc();
// S7netplus writes timeouts into the underlying TcpClient via Plc.WriteTimeout /
// Plc.ReadTimeout (milliseconds). Set before OpenAsync so the handshake itself
// honours the bound.
@@ -889,6 +889,58 @@ public sealed class S7Driver(S7DriverOptions options, string driverInstanceId)
private global::S7.Net.Plc RequirePlc() =>
Plc ?? throw new InvalidOperationException("S7Driver not initialized");
/// <summary>
/// Construct the underlying S7netplus <see cref="Plc"/> honouring
/// <see cref="S7DriverOptions.TsapMode"/>, <see cref="S7DriverOptions.LocalTsap"/>,
/// and <see cref="S7DriverOptions.RemoteTsap"/>. <see cref="TsapMode.Auto"/> falls
/// back to the existing <c>(CpuType, host, port, rack, slot)</c> constructor so the
/// change is opt-in for sites that don't need a non-default class. Other modes go
/// through the raw-TSAP-pair overload, computing the pair from
/// <see cref="S7TsapDefaults"/> and the configured rack/slot, then layering the
/// caller-supplied <see cref="S7DriverOptions.LocalTsap"/> /
/// <see cref="S7DriverOptions.RemoteTsap"/> on top.
/// </summary>
private Plc BuildPlc()
{
if (_options.TsapMode == TsapMode.Auto)
{
// Existing behaviour: S7netplus picks the TSAP pair via TsapPair.GetDefaultTsapPair
// from CpuType + rack + slot. An explicit LocalTsap / RemoteTsap under Auto is
// ignored on purpose — Auto means "let the library decide". Document this in s7.md.
return new Plc(_options.CpuType, _options.Host, _options.Port, _options.Rack, _options.Slot);
}
ushort localTsap;
ushort remoteTsap;
if (_options.TsapMode == TsapMode.Other)
{
if (_options.LocalTsap is not ushort lt || _options.RemoteTsap is not ushort rt)
{
throw new InvalidOperationException(
"S7DriverOptions.TsapMode = Other requires both LocalTsap and RemoteTsap to be set " +
"(no class default exists for Other). Set both, or pick Pg / Op / S7Basic.");
}
localTsap = lt;
remoteTsap = rt;
}
else
{
var classByte = S7TsapDefaults.HighByteFor(_options.TsapMode);
// Compute defaults from the class + configured rack/slot, then let explicit
// overrides win — so e.g. "TsapMode = Pg, LocalTsap = 0x0142" produces a PG-class
// remote with a custom local for sites that need a fixed source-TSAP.
localTsap = _options.LocalTsap ?? S7TsapDefaults.BuildLocalTsap(classByte);
remoteTsap = _options.RemoteTsap ?? S7TsapDefaults.BuildRemoteTsap(
classByte, _options.Rack, _options.Slot);
}
var pair = new global::S7.Net.Protocol.TsapPair(
new global::S7.Net.Protocol.Tsap((byte)(localTsap >> 8), (byte)(localTsap & 0xFF)),
new global::S7.Net.Protocol.Tsap((byte)(remoteTsap >> 8), (byte)(remoteTsap & 0xFF)));
return new Plc(_options.Host, _options.Port, pair);
}
// ---- ITagDiscovery ----
public Task DiscoverAsync(IAddressSpaceBuilder builder, CancellationToken cancellationToken)

19
src/ZB.MOM.WW.OtOpcUa.Driver.S7/S7DriverFactoryExtensions.cs
View File

@@ -53,6 +53,10 @@ public static class S7DriverFactoryExtensions
Timeout = TimeSpan.FromMilliseconds(dto.Probe?.TimeoutMs ?? 2_000),
ProbeAddress = dto.Probe?.ProbeAddress ?? "MW0",
},
TsapMode = ParseEnum<TsapMode>(dto.TsapMode, driverInstanceId, "TsapMode",
fallback: TsapMode.Auto),
LocalTsap = dto.LocalTsap,
RemoteTsap = dto.RemoteTsap,
};
return new S7Driver(options, driverInstanceId);
@@ -103,6 +107,21 @@ public static class S7DriverFactoryExtensions
public int? TimeoutMs { get; init; }
public List<S7TagDto>? Tags { get; init; }
public S7ProbeDto? Probe { get; init; }
/// <summary>
/// Optional connection-class selector — one of <c>Auto</c> (default),
/// <c>Pg</c>, <c>Op</c>, <c>S7Basic</c>, <c>Other</c>. When omitted the driver
/// keeps the existing <c>Auto</c> behaviour (S7netplus picks the TSAP pair
/// from <see cref="CpuType"/>). See <c>docs/v2/s7.md</c> "TSAP / Connection
/// Type" section.
/// </summary>
public string? TsapMode { get; init; }
/// <summary>Optional 16-bit local TSAP override. Required (with <see cref="RemoteTsap"/>) when <c>TsapMode = Other</c>.</summary>
public ushort? LocalTsap { get; init; }
/// <summary>Optional 16-bit remote TSAP override. Required (with <see cref="LocalTsap"/>) when <c>TsapMode = Other</c>.</summary>
public ushort? RemoteTsap { get; init; }
}
internal sealed class S7TagDto

105
src/ZB.MOM.WW.OtOpcUa.Driver.S7/S7DriverOptions.cs
View File

@@ -81,6 +81,111 @@ public sealed class S7DriverOptions
/// opt out of merging regardless of this knob.
/// </remarks>
public int BlockCoalescingGapBytes { get; init; } = S7BlockCoalescingPlanner.DefaultGapMergeBytes;
/// <summary>
/// ISO-on-TCP / S7comm "connection class" selector. Hardened S7-1500 CPUs and some
/// ET 200SP / S7-1200 firmware variants reject the default <b>PG-class</b> TSAP that
/// S7netplus picks under <see cref="TsapMode.Auto"/> and require an <b>OP-class</b>
/// or <b>S7-Basic-class</b> TSAP instead. Picking the wrong class produces the same
/// failure shape as picking the wrong slot — connection refused at COTP handshake
/// time, before any S7comm PDU is sent. See <c>docs/v2/s7.md</c> "TSAP / Connection
/// Type" section for the raw-TSAP byte table and the hardened-CPU motivation.
/// </summary>
/// <remarks>
/// <para>
/// <see cref="TsapMode.Auto"/> preserves existing behaviour — S7netplus picks
/// the TSAP pair from the configured <see cref="CpuType"/> via its
/// <c>TsapPair.GetDefaultTsapPair</c>. Use <see cref="TsapMode.Pg"/> /
/// <see cref="TsapMode.Op"/> / <see cref="TsapMode.S7Basic"/> to force a specific
/// class, or <see cref="TsapMode.Other"/> together with <see cref="LocalTsap"/>
/// and <see cref="RemoteTsap"/> for a fully-manual escape hatch. Explicit
/// <see cref="LocalTsap"/> / <see cref="RemoteTsap"/> overrides win even under
/// <see cref="TsapMode.Pg"/> / <see cref="TsapMode.Op"/> / <see cref="TsapMode.S7Basic"/>.
/// </para>
/// </remarks>
public TsapMode TsapMode { get; init; } = TsapMode.Auto;
/// <summary>
/// Optional fully-manual local TSAP override (16-bit big-endian word — high byte =
/// class selector, low byte = caller-defined). Required (together with
/// <see cref="RemoteTsap"/>) when <see cref="TsapMode"/> is
/// <see cref="TsapMode.Other"/>. Wins over the class-derived default under any
/// non-<see cref="TsapMode.Auto"/> mode.
/// </summary>
public ushort? LocalTsap { get; init; }
/// <summary>
/// Optional fully-manual remote TSAP override (16-bit big-endian word — high byte =
/// class selector, low byte = <c>(rack &lt;&lt; 5) | slot</c> per the S7 spec).
/// Required (together with <see cref="LocalTsap"/>) when <see cref="TsapMode"/> is
/// <see cref="TsapMode.Other"/>. Wins over the class-derived default under any
/// non-<see cref="TsapMode.Auto"/> mode.
/// </summary>
public ushort? RemoteTsap { get; init; }
}
/// <summary>
/// ISO-on-TCP / S7comm connection class. Picks the high byte of the TSAP pair used
/// during COTP handshake. See <c>docs/v2/s7.md</c> "TSAP / Connection Type" section
/// for the raw-byte table and the hardened-CPU motivation.
/// </summary>
public enum TsapMode
{
/// <summary>S7netplus picks the TSAP pair from <see cref="S7DriverOptions.CpuType"/>. Existing behaviour.</summary>
Auto,
/// <summary>PG class — high byte 0x01. Default for development laptops / TIA Portal.</summary>
Pg,
/// <summary>OP class — high byte 0x02. Required by some hardened S7-1500 / ET 200SP deployments.</summary>
Op,
/// <summary>S7-Basic class — high byte 0x03. Used by S7-Basic clients (e.g. some HMI panels and the WinCC BasicPanel SDK).</summary>
S7Basic,
/// <summary>Caller-supplied <see cref="S7DriverOptions.LocalTsap"/> + <see cref="S7DriverOptions.RemoteTsap"/>. Both must be set or driver init throws.</summary>
Other,
}
/// <summary>
/// Raw-TSAP byte constants per ISO-on-TCP / S7comm connection class. The "high byte"
/// is the class selector documented in the Siemens function manual; the local TSAP's
/// low byte is conventionally 0x00 (caller / unprivileged) and the remote TSAP's low
/// byte is <c>(rack &lt;&lt; 5) | slot</c> per the spec. Mirrored in
/// <c>docs/v2/s7.md</c> "TSAP / Connection Type" table.
/// </summary>
public static class S7TsapDefaults
{
/// <summary>PG-class high byte = 0x01.</summary>
public const byte PgClassHighByte = 0x01;
/// <summary>OP-class high byte = 0x02.</summary>
public const byte OpClassHighByte = 0x02;
/// <summary>S7-Basic-class high byte = 0x03.</summary>
public const byte S7BasicClassHighByte = 0x03;
/// <summary>Build the local TSAP (16-bit BE): <c>class &lt;&lt; 8 | 0x00</c>.</summary>
public static ushort BuildLocalTsap(byte classHighByte) => (ushort)(classHighByte << 8);
/// <summary>
/// Build the remote TSAP (16-bit BE): <c>class &lt;&lt; 8 | ((rack &amp; 0x07) &lt;&lt; 5 | (slot &amp; 0x1F))</c>.
/// Matches the convention used by S7netplus's <c>TsapPair.GetDefaultTsapPair</c> for the remote endpoint.
/// </summary>
public static ushort BuildRemoteTsap(byte classHighByte, int rack, int slot)
{
if (rack < 0 || rack > 15)
throw new ArgumentOutOfRangeException(nameof(rack), rack, "rack must be 0..15");
if (slot < 0 || slot > 31)
throw new ArgumentOutOfRangeException(nameof(slot), slot, "slot must be 0..31");
return (ushort)((classHighByte << 8) | ((rack & 0x07) << 5) | (slot & 0x1F));
}
/// <summary>Pick the class high-byte for a non-<see cref="TsapMode.Auto"/> / non-<see cref="TsapMode.Other"/> mode.</summary>
public static byte HighByteFor(TsapMode mode) => mode switch
{
TsapMode.Pg => PgClassHighByte,
TsapMode.Op => OpClassHighByte,
TsapMode.S7Basic => S7BasicClassHighByte,
_ => throw new ArgumentOutOfRangeException(nameof(mode), mode,
"HighByteFor only handles Pg / Op / S7Basic; Auto and Other are caller-handled"),
};
}
public sealed class S7ProbeOptions

213
tests/ZB.MOM.WW.OtOpcUa.Driver.S7.Tests/S7TsapModeTests.cs Normal file
View File

@@ -0,0 +1,213 @@
using System.Text.Json;
using Shouldly;
using Xunit;
namespace ZB.MOM.WW.OtOpcUa.Driver.S7.Tests;
/// <summary>
/// Unit tests for the PR-S7-C2 TSAP / Connection Type selector. Validates the
/// <see cref="S7TsapDefaults"/> raw-byte mapping, the <see cref="TsapMode"/> →
/// constructor branching in <see cref="S7Driver"/>, and JSON DTO round-trip on
/// <see cref="S7DriverFactoryExtensions"/>. The live-PLC handshake is exercised
/// separately (and is hardware-gated to the dev-box S7-1500 lab rig).
/// </summary>
[Trait("Category", "Unit")]
public sealed class S7TsapModeTests
{
[Fact]
public void Default_TsapMode_is_Auto_to_preserve_existing_behaviour()
{
new S7DriverOptions().TsapMode.ShouldBe(TsapMode.Auto);
new S7DriverOptions().LocalTsap.ShouldBeNull();
new S7DriverOptions().RemoteTsap.ShouldBeNull();
}
// ---- High-byte mapping ----
[Theory]
[InlineData(TsapMode.Pg, S7TsapDefaults.PgClassHighByte)]
[InlineData(TsapMode.Op, S7TsapDefaults.OpClassHighByte)]
[InlineData(TsapMode.S7Basic, S7TsapDefaults.S7BasicClassHighByte)]
public void HighByteFor_returns_the_class_selector_for_each_named_mode(TsapMode mode, byte expected)
{
S7TsapDefaults.HighByteFor(mode).ShouldBe(expected);
}
[Theory]
[InlineData(TsapMode.Auto)]
[InlineData(TsapMode.Other)]
public void HighByteFor_throws_for_Auto_and_Other(TsapMode mode)
{
Should.Throw<ArgumentOutOfRangeException>(() => S7TsapDefaults.HighByteFor(mode));
}
// ---- Raw-byte construction ----
[Theory]
[InlineData(S7TsapDefaults.PgClassHighByte, 0x0100)]
[InlineData(S7TsapDefaults.OpClassHighByte, 0x0200)]
[InlineData(S7TsapDefaults.S7BasicClassHighByte, 0x0300)]
public void BuildLocalTsap_uses_class_high_byte_with_zero_low_byte(byte cls, ushort expected)
{
S7TsapDefaults.BuildLocalTsap(cls).ShouldBe(expected);
}
[Theory]
// PG / S7-300 default — rack=0 slot=2 → 0x0102 (matches docs/v2/s7.md table).
[InlineData(S7TsapDefaults.PgClassHighByte, 0, 2, 0x0102)]
// OP / S7-300 default — rack=0 slot=2 → 0x0202.
[InlineData(S7TsapDefaults.OpClassHighByte, 0, 2, 0x0202)]
// S7-Basic / S7-300 default — rack=0 slot=2 → 0x0302.
[InlineData(S7TsapDefaults.S7BasicClassHighByte, 0, 2, 0x0302)]
// S7-1200 / S7-1500 onboard PN — rack=0 slot=0 → low byte 0x00.
[InlineData(S7TsapDefaults.PgClassHighByte, 0, 0, 0x0100)]
// S7-400 distributed — rack=1 slot=3 → low byte = (1<<5)|3 = 0x23.
[InlineData(S7TsapDefaults.OpClassHighByte, 1, 3, 0x0223)]
public void BuildRemoteTsap_packs_class_rack_and_slot_per_S7_spec(byte cls, int rack, int slot, ushort expected)
{
S7TsapDefaults.BuildRemoteTsap(cls, rack, slot).ShouldBe(expected);
}
[Theory]
[InlineData(-1, 0)]
[InlineData(16, 0)]
[InlineData(0, -1)]
[InlineData(0, 32)]
public void BuildRemoteTsap_throws_on_out_of_range_rack_or_slot(int rack, int slot)
{
Should.Throw<ArgumentOutOfRangeException>(() =>
S7TsapDefaults.BuildRemoteTsap(S7TsapDefaults.PgClassHighByte, rack, slot));
}
// ---- Driver construction (Other-mode missing-overrides validation) ----
[Fact]
public async Task Other_mode_without_LocalTsap_or_RemoteTsap_throws_at_initialize()
{
// No LocalTsap / RemoteTsap → BuildPlc should refuse before opening the socket.
var opts = new S7DriverOptions
{
Host = "192.0.2.1",
Timeout = TimeSpan.FromMilliseconds(250),
TsapMode = TsapMode.Other,
};
using var drv = new S7Driver(opts, "s7-other-missing");
var ex = await Should.ThrowAsync<InvalidOperationException>(async () =>
await drv.InitializeAsync("{}", TestContext.Current.CancellationToken));
ex.Message.ShouldContain("LocalTsap");
ex.Message.ShouldContain("RemoteTsap");
}
[Fact]
public async Task Other_mode_with_only_LocalTsap_set_still_throws()
{
var opts = new S7DriverOptions
{
Host = "192.0.2.1",
Timeout = TimeSpan.FromMilliseconds(250),
TsapMode = TsapMode.Other,
LocalTsap = 0x4D57,
// RemoteTsap intentionally null
};
using var drv = new S7Driver(opts, "s7-other-half");
await Should.ThrowAsync<InvalidOperationException>(async () =>
await drv.InitializeAsync("{}", TestContext.Current.CancellationToken));
}
[Fact]
public async Task Other_mode_with_both_overrides_does_not_fail_at_BuildPlc_stage()
{
// With Other-mode + both overrides, BuildPlc must succeed; the connect itself fails
// because 192.0.2.1 is unroutable (RFC 5737), so we expect a transport-shaped Exception
// (NOT InvalidOperationException complaining about missing TSAPs).
var opts = new S7DriverOptions
{
Host = "192.0.2.1",
Timeout = TimeSpan.FromMilliseconds(250),
TsapMode = TsapMode.Other,
LocalTsap = 0x4D57,
RemoteTsap = 0x4D58,
};
using var drv = new S7Driver(opts, "s7-other-ok");
var ex = await Should.ThrowAsync<Exception>(async () =>
await drv.InitializeAsync("{}", TestContext.Current.CancellationToken));
// Should not be the "missing LocalTsap/RemoteTsap" guard — that guard rejects on
// Type, this should be a transport / timeout failure shape.
(ex is InvalidOperationException io && io.Message.Contains("LocalTsap"))
.ShouldBeFalse("Other-mode with both overrides set must pass the BuildPlc guard");
}
// ---- DTO round-trip ----
[Fact]
public void DTO_round_trip_with_TsapMode_Op_and_explicit_overrides()
{
// Mirrors what the central config DB hands to S7DriverFactoryExtensions.CreateInstance.
var json = """
{
"Host": "192.168.1.30",
"CpuType": "S71500",
"Rack": 0,
"Slot": 0,
"TsapMode": "Op",
"LocalTsap": 768,
"RemoteTsap": 770,
"Tags": []
}
""";
var drv = (S7Driver)S7DriverFactoryExtensions.CreateInstance("s7-dto", json);
drv.ShouldNotBeNull();
drv.DriverInstanceId.ShouldBe("s7-dto");
drv.Dispose();
}
[Fact]
public void DTO_unknown_TsapMode_is_rejected()
{
var json = """
{
"Host": "192.168.1.30",
"TsapMode": "ProfiNet",
"Tags": []
}
""";
Should.Throw<InvalidOperationException>(() =>
S7DriverFactoryExtensions.CreateInstance("s7-bad-mode", json));
}
[Fact]
public void DTO_omitting_TsapMode_falls_back_to_Auto()
{
// Critical for backwards-compat: pre-PR-S7-C2 configs must still load.
var json = """
{
"Host": "192.168.1.30",
"Tags": []
}
""";
var drv = S7DriverFactoryExtensions.CreateInstance("s7-legacy", json);
drv.ShouldNotBeNull();
drv.Dispose();
}
[Fact]
public void DTO_round_trip_serialise_then_deserialise_preserves_TSAP_fields()
{
// Round-trip through the DTO type the factory uses, to catch property-name mismatches.
var dto = new S7DriverFactoryExtensions.S7DriverConfigDto
{
Host = "10.0.0.5",
TsapMode = "S7Basic",
LocalTsap = 0x0300,
RemoteTsap = 0x0302,
};
var json = JsonSerializer.Serialize(dto);
var back = JsonSerializer.Deserialize<S7DriverFactoryExtensions.S7DriverConfigDto>(json)!;
back.TsapMode.ShouldBe("S7Basic");
back.LocalTsap.ShouldBe((ushort)0x0300);
back.RemoteTsap.ShouldBe((ushort)0x0302);
}
}