public void FC06Test()
{
// Arrange
var endpoint = EndpointSource.GetNext();
var server = new ModbusTcpServer();
server.Start(endpoint);
var client = new ModbusTcpClient();
client.Connect(endpoint);
// Act
client.WriteSingleRegister(0, 02, 259);
client.WriteSingleRegister(0, 10, 125);
client.WriteSingleRegister(0, 11, 16544);
client.WriteSingleRegister(0, 12, 4848);
// Assert
var expected = new short[] { 0, 0, 259, 0, 0, 0, 0, 0, 0, 0, 125, 16544, 4848 };
lock (server.Lock)
{
var actual = server.GetHoldingRegisterBuffer <short>().Slice(0, 13);
Assert.True(expected.SequenceEqual(actual.ToArray()));
}
}
public async void ServerRespectsMaxClientConnectionLimit()
{
// Arrange
var endpoint = EndpointSource.GetNext();
var server = new ModbusTcpServer()
{
MaxConnections = 2
};
server.Start(endpoint);
// Act
var client1 = new ModbusTcpClient();
var client2 = new ModbusTcpClient();
var client3 = new ModbusTcpClient();
await Task.Run(() =>
{
client1.Connect(endpoint);
client1.WriteSingleRegister(1, 2, 3);
client2.Connect(endpoint);
client2.WriteSingleRegister(1, 2, 3);
client3.Connect(endpoint);
try
{
client3.WriteSingleRegister(1, 2, 3);
}
// Windows
catch (IOException) { }
// Linux
catch (InvalidOperationException) { }
server.MaxConnections = 3;
client3.Connect(endpoint);
client3.WriteSingleRegister(1, 2, 3);
});
server.Stop();
// Assert
}
static void DoClientWork(ModbusTcpClient client, ILogger logger)
{
Span <byte> data;
var sleepTime = TimeSpan.FromMilliseconds(100);
var unitIdentifier = (byte)0xFF;
var startingAddress = (ushort)0;
var registerAddress = (ushort)0;
// ReadHoldingRegisters = 0x03, // FC03
data = client.ReadHoldingRegisters(unitIdentifier, startingAddress, 10);
logger.LogInformation("FC03 - ReadHoldingRegisters: Done");
Thread.Sleep(sleepTime);
// WriteMultipleRegisters = 0x10, // FC16
client.WriteMultipleRegisters(unitIdentifier, startingAddress, new byte[] { 10, 00, 20, 00, 30, 00, 255, 00, 255, 01 });
logger.LogInformation("FC16 - WriteMultipleRegisters: Done");
Thread.Sleep(sleepTime);
// ReadCoils = 0x01, // FC01
data = client.ReadCoils(unitIdentifier, startingAddress, 10);
logger.LogInformation("FC01 - ReadCoils: Done");
Thread.Sleep(sleepTime);
// ReadDiscreteInputs = 0x02, // FC02
data = client.ReadDiscreteInputs(unitIdentifier, startingAddress, 10);
logger.LogInformation("FC02 - ReadDiscreteInputs: Done");
Thread.Sleep(sleepTime);
// ReadInputRegisters = 0x04, // FC04
data = client.ReadInputRegisters(unitIdentifier, startingAddress, 10);
logger.LogInformation("FC04 - ReadInputRegisters: Done");
Thread.Sleep(sleepTime);
// WriteSingleCoil = 0x05, // FC05
client.WriteSingleCoil(unitIdentifier, registerAddress, true);
logger.LogInformation("FC05 - WriteSingleCoil: Done");
Thread.Sleep(sleepTime);
// WriteSingleRegister = 0x06, // FC06
client.WriteSingleRegister(unitIdentifier, registerAddress, new byte[] { 65, 67 });
logger.LogInformation("FC06 - WriteSingleRegister: Done");
}