public Task <object> GetDataAsync()
{
while (!modbusClientAlive)
{
try
{
modbusClient.Init();
modbusClientAlive = true;
}
catch (Exception ex)
{
Console.WriteLine($"[EXCEPTION] Exception while instantiating Modbus client: {ex.Message}");
Console.WriteLine("\nSleeping for 15 seconds before retrying to talk to Modbus host...\n");
Task.Delay(TimeSpan.FromSeconds(15)).Wait();
}
}
var ct = new CancellationToken();
Task <object> t = Task.Run <object>(async() =>
{
var voltage = Array.Empty <short>();
var current = Array.Empty <short>();
var hardwareId = String.Empty;
try
{
voltage = await modbusClient.ReadRegistersAsync(40001, 3);
current = await modbusClient.ReadRegistersAsync(41001, 3);
hardwareId = "Function Code 0x2b (43)";
}
catch (Exception ex)
{
Console.WriteLine(
$"[EXCEPTION] Exception while calling ReadRegistersAsync(): {ex.Message}");
Console.WriteLine(
"\nSleeping for 5 seconds before retrying...\n");
Task.Delay(TimeSpan.FromSeconds(5), ct).Wait(ct);
}
return(new
{
deviceId,
voltage,
current,
hardwareId
});
}, ct);
if (t.Wait(9000, ct))
{
return(t);
}
Console.WriteLine("Aborting modbus Task, took too long to return.");
//Console.WriteLine("Restarting collector...\n");
//Assembly a = Assembly.GetExecutingAssembly();
//System.Diagnostics.Process.Start("dotnet.exe", a.Location);
//Environment.Exit(-2);
return(null);
}
public void SocketTimeoutTest()
{
Console.WriteLine("Running SocketTimeoutTest...");
int TEST_TIMEOUT = 6000;
int MODBUS_CALL_TIMEOUT = 3000;
Int32 port = 50222;
string v4Loopback = ("127.0.0.1");
TcpListener server = new TcpListener(IPAddress.Parse(v4Loopback), port);
server.Start();
CancellationTokenSource cts = new CancellationTokenSource(TEST_TIMEOUT);
CancellationToken ct = cts.Token;
var t = Task.Run(() =>
{
server.AcceptTcpClientAsync();
ModbusClient mc = new ModbusClient(v4Loopback, port, MODBUS_CALL_TIMEOUT);
mc.Init();
short[] r = mc.ReadRegistersAsync(4304, 2, 1).Result;
}, ct);
try
{
t.Wait(ct);
}
catch (OperationCanceledException)
{
Assert.True(false, "The call to ReadRegistersAsync() did not return " +
$"within expected time window of {MODBUS_CALL_TIMEOUT / 1000} seconds.");
}
catch (Exception ex)
{
if (ex.InnerException.InnerException is TimeoutException ||
ex.InnerException.InnerException is IOException)
{
// We expect a TimeoutException or IOException if ReadRegistersAsync() adheres to our timeout
Assert.True(true);
}
else
{
throw;
}
}
finally
{
server.Server.Close();
server.Server.Dispose();
}
}
