private void Input_OnReceive(object sender, ChannelReceivedEventArgs e)
{
MbapHeader header = MbapHeader.Decode(e.Message);
if (header == null)
{
logger?.LogWarning("MBAP Header returned null");
return; //assume keep alive
}
if (!map.HasItem(header.UnitId))
{
byte[] errorMsg = ModbusErrorMessage.Create(e.Message, ErrorCode.GatewayPathsNotAvailable);
this.InputChannel.SendAsync(errorMsg).GetAwaiter();
return;
}
if (!map.GetItem(header.UnitId).Authorize(e.Message))
{
byte[] errorMsg = ModbusErrorMessage.Create(e.Message, ErrorCode.IllegalAddress);
this.InputChannel.SendAsync(errorMsg).GetAwaiter();
return;
}
byte[] message = e.Message;
byte[] msg = null;
foreach (var filter in InputFilters)
{
msg = filter.Execute(message);
msg ??= message;
}
OutputChannel.SendAsync(msg).GetAwaiter();
}
private void Input_OnReceive(object sender, ChannelReceivedEventArgs e)
{
byte[] message = e.Message;
byte[] msg = message;
try
{
MbapHeader header = MbapHeader.Decode(message);
if (header == null)
{
return;
}
Slave slave = config.Slaves.Where(s => s.UnitId == header.UnitId).FirstOrDefault();
byte? alias = slave?.Alias.Value;
foreach (var filter in InputFilters)
{
msg = filter.Execute(message, alias);
msg ??= message;
logger?.LogDebug("Filter executed.");
}
OutputChannel.SendAsync(msg).GetAwaiter();
logger?.LogDebug("Message sent to output channel.");
}
catch (Exception ex)
{
logger?.LogError(ex, "Fault input channel receive.");
}
}
private void Channel_OnReceive(object sender, ChannelReceivedEventArgs e)
{
try
{
MbapHeader header = MbapHeader.Decode(e.Message);
if (!unitId.HasValue)
{
unitId = header.UnitId;
}
if (unitId.HasValue && header.UnitId == unitId.Value)
{
RtuPiSystem piSystem = map.GetItem((ushort)unitId.Value);
if (piSystem == null)
{
throw new Exception($"PI-System not found for unit id - {unitId.Value}");
}
else
{
client.SubscribeAsync(piSystem.RtuOutputEvent, QualityOfServiceLevelType.AtLeastOnce, ReceiveOutput).GetAwaiter();
client.PublishAsync(QualityOfServiceLevelType.AtLeastOnce, piSystem.RtuInputEvent, contentType, e.Message).GetAwaiter();
}
}
else
{
throw new Exception("Unit Id missing from SCADA client message.");
}
}
catch (Exception ex)
{
OnError?.Invoke(this, new AdapterErrorEventArgs(Id, ex));
}
}
public async Task SendAsync(byte[] message)
{
MbapHeader header = MbapHeader.Decode(message);
if (slaveChannels.ContainsKey(header.UnitId))
{
SlaveChannel slaveChannel = slaveChannels[header.UnitId];
await slaveChannel.SendAsync(message);
}
}
private void ModuleReceived(string resource, string contentType, byte[] message)
{
//received a message from subscription
try
{
MbapHeader header = MbapHeader.Decode(message);
diag?.PublishInput(header).GetAwaiter();
logger?.LogDebug("Diagnostics sent input.");
OnReceive?.Invoke(this, new ChannelReceivedEventArgs(channel.Id, message));
}
catch (Exception ex)
{
logger?.LogError(ex, "Unable to decode MBAP header module channel input.");
}
}
public async Task SendAsync(byte[] message)
{
MbapHeader header = MbapHeader.Decode(message);
if (connections.ContainsKey(header.UnitId))
{
TcpConnection connection = connections[header.UnitId].Item1;
byte[] msg = mapper.MapIn(message, connections[header.UnitId].Item2);
await connection.SendAsync(msg);
logger?.LogDebug($"Modbus message sent to UnitId {header.UnitId} TCP channel.");
}
else
{
logger?.LogWarning($"No tcp connection found with Unit ID = {header.UnitId}");
}
}
public async Task SendAsync(byte[] message)
{
if (client == null || !client.IsConnected)
{
logger?.LogWarning("MQTT client is not available to forward message.");
return;
}
try
{
MbapHeader header = MbapHeader.Decode(message);
if (map.HasItem(header.UnitId))
{
if (!subscriptions.Contains(header.UnitId))
{
string resource = map.GetItem(header.UnitId).RtuOutputEvent;
await client.SubscribeAsync(resource, QualityOfServiceLevelType.AtMostOnce,
ModbusMessageReceived);
logger?.LogInformation(
$"MQTT client channel subscribed {resource} with Unit ID = {header.UnitId}");
subscriptions.Add(header.UnitId);
}
cache.Add(GetCacheKey(header), new Tuple <ushort, byte[]>(header.TransactionId, message), 20.0);
string pisystem = map.GetItem(header.UnitId).RtuInputEvent;
await client.PublishAsync(QualityOfServiceLevelType.AtMostOnce, pisystem,
"application/octet-stream", message);
logger?.LogDebug($"VRTU published to {pisystem}");
await diag?.PublishInput(header);
}
else
{
logger?.LogWarning($"Unit Id = {header.UnitId} in Modbus message not found in RTU map.");
}
}
catch (Exception ex)
{
logger?.LogError(ex, "Fault sending MQTT client channel.");
}
}
private async void ReceiveOutput(string topic, string contentType, byte[] message)
{
logger?.LogDebug("SCADA client channel receiving output.");
try
{
MbapHeader header = MbapHeader.Decode(message);
byte[] msg = mapper.MapOut(message);
await channel.SendAsync(msg);
MbapHeader actual = MbapHeader.Decode(msg);
await diagnostics.PublishOutput(actual, header.TransactionId);
logger?.LogDebug("SCADA client channel was sent output message.");
}
catch (Exception ex)
{
logger?.LogError($"SCADA client receive output error - {ex.Message}");
OnError?.Invoke(this, new AdapterErrorEventArgs(Id, ex));
}
}
private void ModbusMessageReceived(string resource, string contentType, byte[] message)
{
try
{
MbapHeader header = MbapHeader.Decode(message);
string key = GetCacheKey(header);
if (cache.Contains(key))
{
cache.Remove(key);
OnReceive?.Invoke(this, new ChannelReceivedEventArgs(channel.Id, message));
logger?.LogDebug("Output channel received message.");
diag?.PublishOutput(header).GetAwaiter();
}
else
{
logger?.LogWarning("Vrtu channel cannot match received message.");
}
}
catch (Exception ex)
{
logger?.LogError(ex, "Fault receiving message on vrtu channel.");
}
}
public async Task SendAsync(byte[] message)
{
if (client == null || !client.IsConnected)
{
logger?.LogWarning("Module channel client is unavailable to send.");
return;
}
try
{
MbapHeader header = MbapHeader.Decode(message);
string pisystem = UriGenerator.GetRtuPiSystem(hostname, virtualRtuId, deviceId, header.UnitId, false);
await client.PublishAsync(QualityOfServiceLevelType.AtMostOnce, pisystem, "application/json", message);
await diag?.PublishOutput(header);
logger?.LogDebug("Published message on module channel");
}
catch (Exception ex)
{
logger?.LogError(ex, "Fault sending on module channel.");
}
}
private async void Channel_OnReceive(object sender, ChannelReceivedEventArgs e)
{
logger?.LogDebug("SCADA client channel starting receive.");
try
{
MbapHeader header = MbapHeader.Decode(e.Message);
RtuPiSystem piSystem = map.GetItem(header.UnitId);
if (piSystem == null)
{
logger?.LogWarning("SCADA client receive cannot find RTU pi-system.");
throw new InvalidOperationException("RTU pi-system was not found.");
}
if (!subscribed.Contains(header.UnitId))
{
//subscribe to pi-system for unit id
await connection.AddSubscriptionAsync(piSystem.RtuOutputEvent.ToLowerInvariant(), ReceiveOutput);
subscribed.Add(header.UnitId);
}
byte[] msg = mapper.MapIn(e.Message);
await connection.SendAsync(piSystem.RtuInputEvent.ToLowerInvariant(), CONTENT_TYPE, msg);
MbapHeader mheader = MbapHeader.Decode(msg);
//await connection.Monitor.SendInAsync(ModuleType.VRTU.ToString(), e.Message, mheader.TransactionId);
}
catch (Exception ex)
{
logger?.LogError($"SCADA client receive error - {ex.Message}");
OnError?.Invoke(this, new AdapterErrorEventArgs(Id, ex));
}
}
private static void Main(string[] args)
{
Console.WriteLine("8\"\"\"\"8 8\"\"\"\"8 8\"\"\"\"8 8\"\"\"\"8 8\"\"\"\"8");
Console.WriteLine("8 8 \" 8 8 8 8 8 8");
Console.WriteLine("8eeeee 8e 8eeee8 8e 8 8eeee8 ");
Console.WriteLine(" 88 88 88 8 88 8 88 8");
Console.WriteLine("e 88 88 e 88 8 88 8 88 8 ");
Console.WriteLine("8eee88 88eee8 88 8 88eee8 88 8");
Console.WriteLine("");
Console.WriteLine("8\"\"\"\"8");
Console.WriteLine("8 \" e e eeee eeeee eeeee ");
Console.WriteLine("8e 8 8 8 8 8 8");
Console.WriteLine("88 8e 8e 8eee 8e 8 8e");
Console.WriteLine("88 e 88 88 88 88 8 88");
Console.WriteLine("88eee8 88eee 88 88ee 88 8 88");
Console.WriteLine("");
Console.WriteLine("press any key to continue");
Console.ReadKey();
//string publicIP = "168.62.59.20";
string publicIP = "20.185.9.100";
Console.Write("Enter for default IP (127.0.0.1)? ");
string inputIpAddress = Console.ReadLine();
if (!string.IsNullOrEmpty(inputIpAddress))
{
publicIP = inputIpAddress;
}
else
{
publicIP = "127.0.0.1";
}
Random ran = new Random();
byte[] buffer = new byte[100];
ran.NextBytes(buffer);
MbapHeader header = new MbapHeader
{
UnitId = 2,
ProtocolId = 1,
TransactionId = 1,
Length = 6
};
byte[] body = { 3, 79, 27, 0, 10 };
byte[] array = header.Encode();
byte[] output = new byte[buffer.Length + array.Length];
Buffer.BlockCopy(array, 0, output, 0, array.Length);
Buffer.BlockCopy(buffer, 0, output, array.Length, buffer.Length);
byte[] o2 = Convert.FromBase64String("AAEAAAAGAQNPGwAK");
MbapHeader mh = MbapHeader.Decode(o2);
output = o2;
string x = BitConverter.ToString(o2);
CancellationTokenSource cts = new CancellationTokenSource();
IPEndPoint endpoint = new IPEndPoint(IPAddress.Parse(publicIP), 502);
channel = ChannelFactory.Create(false, endpoint, 1024, 4048, cts.Token);
channel.OnError += Channel_OnError;
channel.OnClose += Channel_OnClose;
channel.OnOpen += Channel_OnOpen;
channel.OnReceive += Channel_OnReceive;
channel.OpenAsync().GetAwaiter();
while (!ican)
{
Task t = Task.Delay(2000);
Task.WaitAll(t);
}
//channel.SendAsync(output).GetAwaiter();
bool test = true;
while (test)
{
Console.Write("Send a message [y/n] ? ");
string decision = Console.ReadLine();
if (decision.ToLowerInvariant() == "y")
{
byte[] payload = Convert.FromBase64String("AAEAAAAGAQNPGwAK");
//MbapHeader header2 = MbapHeader.Decode(payload);
//header2.UnitId = 2;
//byte[] headerBytes = header2.Encode();
//byte[] buffer2 = new byte[payload.Length];
//Buffer.BlockCopy(headerBytes, 0, buffer2, 0, headerBytes.Length);
//Buffer.BlockCopy(payload, headerBytes.Length, buffer2, headerBytes.Length, payload.Length - headerBytes.Length);
//dummy++;
//payload[1] = dummy;
//string bc = BitConverter.ToString(payload);
//channel.SendAsync(buffer2).GetAwaiter();
channel.SendAsync(payload).GetAwaiter();
//channel.SendAsync(output).GetAwaiter();
Console.WriteLine($"Sent message length {output.Length}");
}
else
{
test = false;
}
}
Console.WriteLine("terminating...");
Console.ReadKey();
}