private async Task <SendMessageResult> sendMessageAsync(ReadOnlyMemory <byte> message, ProtocolType protocol, int timeout, CancellationToken cancellationToken) { SendMessageResult result = new SendMessageResult { Bytes = 0, Packets = 0, }; ReadOnlyMemory <byte> modbusTcpMessage = buildTcpMessage(message, protocol); try { result.Bytes += await _client.SendAsync(modbusTcpMessage, timeout, cancellationToken); result.Packets += 1; } catch (ObjectDisposedException) { throw new UnitronicsException("Failed to Send " + protocol + " Message to Unitronics PLC '" + RemoteHost + ":" + Port + "' - The underlying Socket Connection has been Closed"); } catch (TimeoutException) { throw new UnitronicsException("Failed to Send " + protocol + " Message within the Timeout Period to Unitronics PLC '" + RemoteHost + ":" + Port + "'"); } catch (System.Net.Sockets.SocketException e) { throw new UnitronicsException("Failed to Send " + protocol + " Message to Unitronics PLC '" + RemoteHost + ":" + Port + "'", e); } return(result); }
public async Task <ProcessMessageResult> ProcessMessageAsync(ReadOnlyMemory <byte> requestMessage, ProtocolType protocol, byte unitId, int timeout, int retries, CancellationToken cancellationToken) { int attempts = 0; Memory <byte> responseMessage = new Memory <byte>(); int bytesSent = 0; int packetsSent = 0; int bytesReceived = 0; int packetsReceived = 0; DateTime startTimestamp = DateTime.UtcNow; while (attempts <= retries) { try { if (!_semaphore.Wait(0)) { await _semaphore.WaitAsync(cancellationToken); } if (attempts > 0) { await destroyAndInitializeClient(timeout, cancellationToken); } // Send the Message SendMessageResult sendResult = await sendMessageAsync(requestMessage, protocol, timeout, cancellationToken); bytesSent += sendResult.Bytes; packetsSent += sendResult.Packets; // Receive a Response ReceiveMessageResult receiveResult = await receiveMessageAsync(protocol, timeout, cancellationToken); bytesReceived += receiveResult.Bytes; packetsReceived += receiveResult.Packets; responseMessage = receiveResult.Message; break; } catch (Exception) { if (attempts >= retries) { throw; } } finally { _semaphore.Release(); } // Increment the Attempts attempts++; } return(new ProcessMessageResult { BytesSent = bytesSent, PacketsSent = packetsSent, BytesReceived = bytesReceived, PacketsReceived = packetsReceived, Duration = DateTime.UtcNow.Subtract(startTimestamp).TotalMilliseconds, ResponseMessage = responseMessage, }); }