├── .gitignore ├── Dockerfile ├── LICENSE ├── README.md └── src ├── NModbus.DeviceSimulator.sln └── NModbus.DeviceSimulator ├── DeviceConfiguration.cs ├── DeviceType.cs ├── DeviceWorker.cs ├── Devices ├── DeviceService.cs ├── TcpDeviceService.cs └── UdpDeviceService.cs ├── ModbusLogger.cs ├── NModbus.DeviceSimulator.csproj ├── Program.cs └── Properties └── launchSettings.json /.gitignore: -------------------------------------------------------------------------------- 1 | ## Ignore Visual Studio temporary files, build results, and 2 | ## files generated by popular Visual Studio add-ons. 3 | ## 4 | ## Get latest from https://github.com/github/gitignore/blob/master/VisualStudio.gitignore 5 | 6 | # User-specific files 7 | *.rsuser 8 | *.suo 9 | *.user 10 | *.userosscache 11 | *.sln.docstates 12 | 13 | # User-specific files (MonoDevelop/Xamarin Studio) 14 | *.userprefs 15 | 16 | # Mono auto generated files 17 | mono_crash.* 18 | 19 | # Build results 20 | [Dd]ebug/ 21 | [Dd]ebugPublic/ 22 | [Rr]elease/ 23 | [Rr]eleases/ 24 | x64/ 25 | x86/ 26 | [Aa][Rr][Mm]/ 27 | [Aa][Rr][Mm]64/ 28 | bld/ 29 | [Bb]in/ 30 | [Oo]bj/ 31 | [Ll]og/ 32 | [Ll]ogs/ 33 | 34 | # Visual Studio 2015/2017 cache/options directory 35 | .vs/ 36 | # Uncomment if you have tasks that create the project's static files in wwwroot 37 | #wwwroot/ 38 | 39 | # Visual Studio 2017 auto generated files 40 | Generated\ Files/ 41 | 42 | # MSTest test Results 43 | [Tt]est[Rr]esult*/ 44 | [Bb]uild[Ll]og.* 45 | 46 | # NUnit 47 | *.VisualState.xml 48 | TestResult.xml 49 | nunit-*.xml 50 | 51 | # Build Results of an ATL Project 52 | [Dd]ebugPS/ 53 | [Rr]eleasePS/ 54 | dlldata.c 55 | 56 | # Benchmark Results 57 | BenchmarkDotNet.Artifacts/ 58 | 59 | # .NET Core 60 | project.lock.json 61 | project.fragment.lock.json 62 | artifacts/ 63 | 64 | # StyleCop 65 | StyleCopReport.xml 66 | 67 | # Files built by Visual Studio 68 | *_i.c 69 | *_p.c 70 | *_h.h 71 | *.ilk 72 | *.meta 73 | *.obj 74 | *.iobj 75 | *.pch 76 | *.pdb 77 | *.ipdb 78 | *.pgc 79 | *.pgd 80 | *.rsp 81 | *.sbr 82 | *.tlb 83 | *.tli 84 | *.tlh 85 | *.tmp 86 | *.tmp_proj 87 | *_wpftmp.csproj 88 | *.log 89 | *.vspscc 90 | *.vssscc 91 | .builds 92 | *.pidb 93 | *.svclog 94 | *.scc 95 | 96 | # Chutzpah Test files 97 | _Chutzpah* 98 | 99 | # Visual C++ cache files 100 | ipch/ 101 | *.aps 102 | *.ncb 103 | *.opendb 104 | *.opensdf 105 | *.sdf 106 | *.cachefile 107 | *.VC.db 108 | *.VC.VC.opendb 109 | 110 | # Visual Studio profiler 111 | *.psess 112 | *.vsp 113 | *.vspx 114 | *.sap 115 | 116 | # Visual Studio Trace Files 117 | *.e2e 118 | 119 | # TFS 2012 Local Workspace 120 | $tf/ 121 | 122 | # Guidance Automation Toolkit 123 | *.gpState 124 | 125 | # ReSharper is a .NET coding add-in 126 | _ReSharper*/ 127 | *.[Rr]e[Ss]harper 128 | *.DotSettings.user 129 | 130 | # TeamCity is a build add-in 131 | _TeamCity* 132 | 133 | # DotCover is a Code Coverage Tool 134 | *.dotCover 135 | 136 | # AxoCover is a Code Coverage Tool 137 | .axoCover/* 138 | !.axoCover/settings.json 139 | 140 | # Visual Studio code coverage results 141 | *.coverage 142 | *.coveragexml 143 | 144 | # NCrunch 145 | _NCrunch_* 146 | .*crunch*.local.xml 147 | nCrunchTemp_* 148 | 149 | # MightyMoose 150 | *.mm.* 151 | AutoTest.Net/ 152 | 153 | # Web workbench (sass) 154 | .sass-cache/ 155 | 156 | # Installshield output folder 157 | [Ee]xpress/ 158 | 159 | # DocProject is a documentation generator add-in 160 | DocProject/buildhelp/ 161 | DocProject/Help/*.HxT 162 | DocProject/Help/*.HxC 163 | DocProject/Help/*.hhc 164 | DocProject/Help/*.hhk 165 | DocProject/Help/*.hhp 166 | DocProject/Help/Html2 167 | DocProject/Help/html 168 | 169 | # Click-Once directory 170 | publish/ 171 | 172 | # Publish Web Output 173 | *.[Pp]ublish.xml 174 | *.azurePubxml 175 | # Note: Comment the next line if you want to checkin your web deploy settings, 176 | # but database connection strings (with potential passwords) will be unencrypted 177 | *.pubxml 178 | *.publishproj 179 | 180 | # Microsoft Azure Web App publish settings. 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IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # NModbus.DeviceSimulator 2 | Simple project that demonstrates a Modbus device. 3 | 4 | # Limitations 5 | Initially, the simulator only supports simulating a TCP device. 6 | 7 | # Docker 8 | 9 | To run in docker: 10 | 11 | `docker run -it --rm -p 502:502 --name devicesim nmodbus/devicesim` 12 | 13 | To specify the port: 14 | 15 | `docker run -it --rm -p 1000:1000 -e "DEVICE__PORT=1000" --name devicesim nmodbus/devicesim` 16 | 17 | To run UDP: 18 | 19 | `docker run -it --rm -p 502:502/udp -e "DEVICE__DEVICETYPE=UDP" --name devicesim devicesim` 20 | 21 | # Environment Variables 22 | 23 | |Option|Default Value|Description| 24 | |---|---|---| 25 | |DEVICE__DEVICETYPE | Tcp | Tcp, Udp | 26 | |DEVICE__ADDRESS | | The address to use for Tcp. Usually not needed. | 27 | |DEVICE__PORT | 502 | The port to listen on (Applies to Tcp / Udp). | 28 | |DEVICE__UNITIDS| 1 | Comma delimited list of unit ids. | 29 | |DEVICE__VERBOSE| false | Additional logging. | 30 | 31 | -------------------------------------------------------------------------------- /src/NModbus.DeviceSimulator.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 16 4 | VisualStudioVersion = 16.0.30204.135 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NModbus.DeviceSimulator", "NModbus.DeviceSimulator\NModbus.DeviceSimulator.csproj", "{376B5939-85D5-4772-91FA-819C0E4F5115}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|Any CPU = Debug|Any CPU 11 | Release|Any CPU = Release|Any CPU 12 | EndGlobalSection 13 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 14 | {376B5939-85D5-4772-91FA-819C0E4F5115}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 15 | {376B5939-85D5-4772-91FA-819C0E4F5115}.Debug|Any CPU.Build.0 = Debug|Any CPU 16 | {376B5939-85D5-4772-91FA-819C0E4F5115}.Release|Any CPU.ActiveCfg = Release|Any CPU 17 | {376B5939-85D5-4772-91FA-819C0E4F5115}.Release|Any CPU.Build.0 = Release|Any CPU 18 | EndGlobalSection 19 | GlobalSection(SolutionProperties) = preSolution 20 | HideSolutionNode = FALSE 21 | EndGlobalSection 22 | GlobalSection(ExtensibilityGlobals) = postSolution 23 | SolutionGuid = {8A235B6F-2AA3-443F-B01C-3AEFAF5C39EB} 24 | EndGlobalSection 25 | EndGlobal 26 | -------------------------------------------------------------------------------- /src/NModbus.DeviceSimulator/DeviceConfiguration.cs: -------------------------------------------------------------------------------- 1 | namespace NModbus.DeviceSimulator 2 | { 3 | public class DeviceConfiguration 4 | { 5 | /// 6 | /// The type of device to use. 7 | /// 8 | public DeviceType DeviceType { get; set; } = DeviceType.Tcp; 9 | 10 | /// 11 | /// The port on which to listen for incoming connections. 12 | /// 13 | public int Port { get; set; } = 502; 14 | 15 | /// 16 | /// The unit id (address) of the device. 17 | /// 18 | public string UnitIds { get; set; } = "1"; 19 | 20 | /// 21 | /// The local IP Address to use. This normally doesn't need to be specified. 22 | /// 23 | public string IpAddress { get; set; } 24 | 25 | /// 26 | /// Set to true to enable additional logging. 27 | /// 28 | public bool Verbose { get; set; } = false; 29 | } 30 | } 31 | -------------------------------------------------------------------------------- /src/NModbus.DeviceSimulator/DeviceType.cs: -------------------------------------------------------------------------------- 1 | namespace NModbus.DeviceSimulator 2 | { 3 | public enum DeviceType 4 | { 5 | /// 6 | /// Tcp 7 | /// 8 | Tcp, 9 | 10 | /// 11 | /// Udp 12 | /// 13 | Udp 14 | } 15 | } 16 | -------------------------------------------------------------------------------- /src/NModbus.DeviceSimulator/DeviceWorker.cs: -------------------------------------------------------------------------------- 1 | using Microsoft.Extensions.Hosting; 2 | using Microsoft.Extensions.Logging; 3 | using NModbus.DeviceSimulator.Devices; 4 | using System; 5 | using System.Collections.Generic; 6 | using System.Linq; 7 | using System.Threading; 8 | using System.Threading.Tasks; 9 | 10 | namespace NModbus.DeviceSimulator 11 | { 12 | public class DeviceWorker : IHostedService 13 | { 14 | private readonly ILogger _logger; 15 | private readonly DeviceConfiguration _configuration; 16 | private readonly DeviceService[] _deviceServices; 17 | 18 | private Task _runTask; 19 | private CancellationTokenSource _runCts; 20 | private DeviceService _deviceService; 21 | 22 | public DeviceWorker( 23 | ILogger logger, 24 | DeviceConfiguration configuration, 25 | IEnumerable deviceServices) 26 | { 27 | _logger = logger; 28 | _configuration = configuration; 29 | _deviceServices = deviceServices.ToArray(); 30 | } 31 | 32 | public Task StartAsync(CancellationToken cancellationToken) 33 | { 34 | _logger.LogInformation("Device type is {DeviceType}.", _configuration.DeviceType); 35 | 36 | _deviceService = _deviceServices 37 | .FirstOrDefault(s => s.DeviceType == _configuration.DeviceType); 38 | 39 | if (_deviceService == null) 40 | throw new Exception($"Unable to find a service for device type '{_configuration.DeviceType}'."); 41 | 42 | _runCts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken); 43 | 44 | _runTask = _deviceService.RunAsync(_runCts.Token); 45 | 46 | _logger.LogInformation("Startup complete."); 47 | 48 | return Task.CompletedTask; 49 | } 50 | 51 | public async Task StopAsync(CancellationToken cancellationToken) 52 | { 53 | _logger.LogInformation("Stopping listener..."); 54 | 55 | _runCts?.Cancel(); 56 | 57 | await _deviceService.StopAsync(); 58 | 59 | try 60 | { 61 | await Task.WhenAll(_runTask); 62 | } 63 | catch(Exception ex) 64 | { 65 | _logger.LogTrace(ex, "Error stopping device."); 66 | } 67 | 68 | _logger.LogInformation("Device stopped."); 69 | } 70 | } 71 | } 72 | -------------------------------------------------------------------------------- /src/NModbus.DeviceSimulator/Devices/DeviceService.cs: -------------------------------------------------------------------------------- 1 | using Microsoft.Extensions.Logging; 2 | using NModbus.Data; 3 | using System; 4 | using System.Collections.Generic; 5 | using System.Linq; 6 | using System.Net; 7 | using System.Threading; 8 | using System.Threading.Tasks; 9 | 10 | namespace NModbus.DeviceSimulator.Devices 11 | { 12 | public abstract class DeviceService 13 | { 14 | protected DeviceService(ILogger logger, IModbusFactory factory, DeviceConfiguration configuration) 15 | { 16 | Logger = logger; 17 | Factory = factory; 18 | Configuration = configuration; 19 | } 20 | 21 | public abstract DeviceType DeviceType { get; } 22 | 23 | protected ILogger Logger { get; } 24 | 25 | protected IModbusFactory Factory { get; } 26 | 27 | protected DeviceConfiguration Configuration { get; } 28 | 29 | public async Task RunAsync(CancellationToken cancellationToken) 30 | { 31 | //Create the network 32 | var network = await CreateNetworkAsync(); 33 | 34 | //Create a datastore 35 | var dataStore = new SlaveDataStore(); 36 | 37 | //Log the operations for debugging purposes. 38 | dataStore.HoldingRegisters.BeforeRead += (sender, args) => LogReadAction("HoldingRegister(s)", args); 39 | dataStore.InputRegisters.BeforeRead += (sender, args) => LogReadAction("InputRegister(s)", args); 40 | dataStore.CoilDiscretes.BeforeRead += (sender, args) => LogReadAction("CoilDiscrete(s)", args); 41 | dataStore.CoilInputs.BeforeRead += (sender, args) => LogReadAction("CoilInput(s)", args); 42 | 43 | dataStore.HoldingRegisters.BeforeWrite += (sender, args) => LogWriteAction("HoldingRegister(s)", args); 44 | dataStore.CoilDiscretes.BeforeWrite += (sender, args) => LogWriteAction("CoilInput(s)", args); 45 | 46 | var unitIds = GetUnitIds(); 47 | 48 | foreach(var unitId in unitIds) 49 | { 50 | Logger.LogInformation("Adding device with unit id: {UnitId}", unitId); 51 | 52 | var device = Factory.CreateSlave(unitId, dataStore); 53 | 54 | //Add the device to the network 55 | network.AddSlave(device); 56 | } 57 | 58 | //Listen 59 | await network.ListenAsync(cancellationToken); 60 | } 61 | 62 | private byte[] GetUnitIds() 63 | { 64 | if (string.IsNullOrWhiteSpace(Configuration.UnitIds)) 65 | throw new ApplicationException("No UnitIds were specified."); 66 | 67 | var split = Configuration.UnitIds.Split(','); 68 | 69 | var unitIds = new List(split.Length); 70 | 71 | foreach(var raw in split) 72 | { 73 | if (!byte.TryParse(raw, out var unitid)) 74 | throw new ApplicationException($"Unable to parse unit id '{raw}'."); 75 | 76 | unitIds.Add(unitid); 77 | } 78 | 79 | return unitIds.ToArray(); 80 | } 81 | 82 | private void LogReadAction(string type, Device.PointEventArgs args) 83 | { 84 | Logger.LogInformation("{Count} {Type} read starting at {Address}.", 85 | args.NumberOfPoints, 86 | type, 87 | args.StartAddress); 88 | } 89 | 90 | private void LogWriteAction(string type, Device.PointEventArgs args) 91 | { 92 | var data = string.Join(", ", args.Points.Select(p => p.ToString())); 93 | 94 | Logger.LogInformation("{Count} {Type} written starting at {Address}: [{Data}]", 95 | args.NumberOfPoints, 96 | type, 97 | args.StartAddress, 98 | data); 99 | } 100 | 101 | private void LogWriteAction(string type, Device.PointEventArgs args) 102 | { 103 | var data = string.Join(", ", args.Points.Select(p => p ? "1" : "0")); 104 | 105 | Logger.LogInformation("{Count} {Type} written starting at {Address}: [{Data}]", 106 | args.NumberOfPoints, 107 | type, 108 | args.StartAddress, 109 | data); 110 | } 111 | 112 | protected abstract Task CreateNetworkAsync(); 113 | 114 | public abstract Task StopAsync(); 115 | } 116 | 117 | } 118 | -------------------------------------------------------------------------------- /src/NModbus.DeviceSimulator/Devices/TcpDeviceService.cs: -------------------------------------------------------------------------------- 1 | using Microsoft.Extensions.Logging; 2 | using System.Net; 3 | using System.Net.Sockets; 4 | using System.Threading.Tasks; 5 | 6 | namespace NModbus.DeviceSimulator.Devices 7 | { 8 | public class TcpDeviceService : DeviceService 9 | { 10 | private TcpListener _tcpListener; 11 | 12 | public override DeviceType DeviceType => DeviceType.Tcp; 13 | 14 | public TcpDeviceService(ILogger logger, IModbusFactory factory, DeviceConfiguration configuration) 15 | : base(logger, factory, configuration) 16 | { 17 | } 18 | 19 | protected IPAddress GetIpAddress() 20 | { 21 | if (string.IsNullOrWhiteSpace(Configuration.IpAddress)) 22 | { 23 | return IPAddress.Any; 24 | } 25 | 26 | return IPAddress.Parse(Configuration.IpAddress); 27 | } 28 | 29 | protected override Task CreateNetworkAsync() 30 | { 31 | var address = GetIpAddress(); 32 | 33 | Logger.LogInformation("Starting Modbus TCP network on {IPAddress}:{Port}", 34 | address, 35 | Configuration.Port); 36 | 37 | //Start up a listener 38 | _tcpListener = new TcpListener(address, Configuration.Port); 39 | _tcpListener.Start(); 40 | 41 | return Task.FromResult(Factory.CreateSlaveNetwork(_tcpListener)); 42 | } 43 | 44 | public override Task StopAsync() 45 | { 46 | _tcpListener?.Stop(); 47 | 48 | return Task.CompletedTask; 49 | } 50 | } 51 | 52 | } 53 | -------------------------------------------------------------------------------- /src/NModbus.DeviceSimulator/Devices/UdpDeviceService.cs: -------------------------------------------------------------------------------- 1 | using Microsoft.Extensions.Logging; 2 | using System.Net.Sockets; 3 | using System.Threading.Tasks; 4 | 5 | namespace NModbus.DeviceSimulator.Devices 6 | { 7 | public class UdpDeviceService : DeviceService 8 | { 9 | private UdpClient _udpClient; 10 | 11 | public UdpDeviceService(ILogger logger, IModbusFactory factory, DeviceConfiguration configuration) 12 | : base(logger, factory, configuration) 13 | { 14 | } 15 | 16 | public override DeviceType DeviceType => DeviceType.Udp; 17 | 18 | protected override Task CreateNetworkAsync() 19 | { 20 | Logger.LogInformation("Starting Modbus UDP network on port {Port}", 21 | Configuration.Port); 22 | 23 | _udpClient = new UdpClient(Configuration.Port); 24 | 25 | //_udpClient.Connect(address, Configuration.Port); 26 | 27 | return Task.FromResult(Factory.CreateSlaveNetwork(_udpClient)); 28 | } 29 | 30 | public override Task StopAsync() 31 | { 32 | _udpClient.Dispose(); 33 | 34 | return Task.CompletedTask; 35 | } 36 | } 37 | } 38 | -------------------------------------------------------------------------------- /src/NModbus.DeviceSimulator/ModbusLogger.cs: -------------------------------------------------------------------------------- 1 | using Microsoft.Extensions.Logging; 2 | 3 | namespace NModbus.DeviceSimulator 4 | { 5 | public class ModbusLogger : IModbusLogger 6 | { 7 | private readonly ILogger _logger; 8 | 9 | public ModbusLogger(ILogger logger) 10 | { 11 | _logger = logger; 12 | } 13 | 14 | public void Log(LoggingLevel level, string message) 15 | { 16 | _logger.LogInformation("[{Level}] {Message}", level, message); 17 | } 18 | 19 | public bool ShouldLog(LoggingLevel level) 20 | { 21 | return true; 22 | } 23 | } 24 | } 25 | -------------------------------------------------------------------------------- /src/NModbus.DeviceSimulator/NModbus.DeviceSimulator.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | Exe 5 | netcoreapp3.1 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | -------------------------------------------------------------------------------- /src/NModbus.DeviceSimulator/Program.cs: -------------------------------------------------------------------------------- 1 | using Microsoft.Extensions.Configuration; 2 | using Microsoft.Extensions.DependencyInjection; 3 | using Microsoft.Extensions.Hosting; 4 | using NModbus.DeviceSimulator.Devices; 5 | using System.Threading.Tasks; 6 | 7 | namespace NModbus.DeviceSimulator 8 | { 9 | class Program 10 | { 11 | static async Task Main(string[] args) 12 | { 13 | var host = CreateHostBuilder(args).Build(); 14 | 15 | await host.RunAsync(); 16 | } 17 | 18 | public static IHostBuilder CreateHostBuilder(string[] args) 19 | { 20 | return Host.CreateDefaultBuilder(args) 21 | .ConfigureHostConfiguration(configHost => 22 | { 23 | configHost.AddEnvironmentVariables(); 24 | }) 25 | .ConfigureServices((hostContext, services) => 26 | { 27 | services.AddHostedService(); 28 | services.AddSingleton(); 29 | services.AddSingleton(serviceProvider => 30 | { 31 | var config = serviceProvider.GetRequiredService(); 32 | 33 | var deviceConfiguration = new DeviceConfiguration(); 34 | 35 | config.GetSection("Device").Bind(deviceConfiguration); 36 | 37 | return deviceConfiguration; 38 | }); 39 | 40 | services.AddSingleton(serviceProvider => { 41 | 42 | var deviceConfiguration = serviceProvider.GetRequiredService(); 43 | 44 | if (deviceConfiguration.Verbose) 45 | { 46 | var modbusLogger = serviceProvider.GetRequiredService(); 47 | 48 | return new ModbusFactory(logger: modbusLogger); 49 | } 50 | 51 | return new ModbusFactory(); 52 | }); 53 | 54 | //Device Services 55 | services.AddSingleton(); 56 | services.AddSingleton(); 57 | }); 58 | } 59 | } 60 | } 61 | -------------------------------------------------------------------------------- /src/NModbus.DeviceSimulator/Properties/launchSettings.json: -------------------------------------------------------------------------------- 1 | { 2 | "profiles": { 3 | "NModbus.DeviceSimulator": { 4 | "commandName": "Project", 5 | "environmentVariables": { 6 | "Device__Verbose": "true", 7 | "Device__DeviceType": "Udp", 8 | "Device__UnitIds": "1, 2, 3, 4, 20" 9 | 10 | 11 | } 12 | } 13 | } 14 | } --------------------------------------------------------------------------------