Beispiel #1
0
        private void OnReceive(IAsyncResult result)
        {
            if (result.IsCompleted == false)
            {
                CallException(0xFF, 0xFF, ModbusCommand.ExceptionConnectionLost);
            }

            //create a writer for accumulate the incoming data
            var incoming = new ByteArrayWriter();

            //append data to the writer
            incoming.WriteBytes(tcpAsyClBuffer, 0, tcpAsyClBuffer[8] + 9);
            var data = (ClientCommData)result.AsyncState;

            //try to decode the stream
            data.IncomingData = incoming.ToReader();
            var resp = data.OwnerProtocol.Codec.ClientDecode(data);

            if (OnResponseData != null)
            {
                OnResponseData(resp);
            }
        }
Beispiel #2
0
        /// <summary>
        /// Entry-point for submitting a query to the remote device
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public CommResponse Query(ClientCommData data)
        {
            lock (Port)
            {
                //convert the request data as an ordinary byte array
                byte[] outgoing = data.OutgoingData.ToArray();

                //create a writer for accumulate the incoming data
                var incoming = new ByteArrayWriter();

                const int tempSize = 256;
                var temp = new byte[tempSize];

                //retries loop
                for (int attempt = 0, retries = data.Retries; attempt < retries; attempt++)
                {
                    //phyiscal writing
                    Port.Send(outgoing);
                    incoming.Reset();

                    //start the local timer
                    bool timeoutExpired;
                    int totalTimeout = Latency + data.Timeout;

                    using (new Timer(_ => timeoutExpired = true, null, totalTimeout, Timeout.Infinite))
                    {
                        //reception loop, until a valid response or timeout
                        timeoutExpired = false;
                        while (timeoutExpired == false)
                        {
                            var length = Port.Available;

                            if (length > 0)
                            {
                                if (length > tempSize)
                                    length = tempSize;

                                //read the incoming data from the physical port
                                Port.Receive(temp, length, SocketFlags.None);

                                //append data to the writer
                                incoming.WriteBytes(temp, 0, length);

                                //try to decode the stream
                                data.IncomingData = incoming.ToReader();

                                CommResponse result = data.OwnerProtocol.Codec.ClientDecode(data);

                                //exit whether any concrete result: either good or bad
                                if (result.Status == CommResponse.Ack)
                                {
                                    return result;
                                }
                                if (result.Status == CommResponse.Critical)
                                {
                                    return result;
                                }
                                if (result.Status != CommResponse.Unknown)
                                {
                                    break;
                                }
                            }

                            Thread.Sleep(0);

                            //stop immediately if the host asked to abort

                            //TODO
                        }
                    }   //using (timer)
                }       //for

                //no attempt was successful
                return new CommResponse(
                    data,
                    CommResponse.Critical);
            }   //lock
        }
Beispiel #3
0
        private void OnReceive(IAsyncResult result)
        {
            if (result.IsCompleted == false) CallException(0xFF, 0xFF, ModbusCommand.ExceptionConnectionLost);

            //create a writer for accumulate the incoming data
            var incoming = new ByteArrayWriter();
            //append data to the writer
            incoming.WriteBytes(tcpAsyClBuffer, 0, tcpAsyClBuffer[8]+9);
            var data = (ClientCommData)result.AsyncState;
            //try to decode the stream
            data.IncomingData = incoming.ToReader();
            var resp = data.OwnerProtocol.Codec.ClientDecode(data);
            if (OnResponseData != null) OnResponseData(resp);
        }
        /// <summary>
        /// Entry-point for submitting a query to the remote device
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public CommResponse Query(ClientCommData data)
        {
            lock (Port)
            {
                //convert the request data as an ordinary byte array
                byte[] outgoing = data
                                  .OutgoingData
                                  .ToArray();

                //create a writer for accumulate the incoming data
                var incoming = new ByteArrayWriter();

                const int tempSize = 256;
                var       temp     = new byte[tempSize];

                //retries loop
                for (int attempt = 0, retries = data.Retries; attempt < retries; attempt++)
                {
                    //flush any residual content
                    Port
                    .DiscardInBuffer();

                    Port
                    .DiscardOutBuffer();

                    //phyiscal writing
                    Port
                    .Write(outgoing, 0, outgoing.Length);

                    incoming.Reset();
                    Thread.Sleep(100);
                    //start the local timer
                    bool timeoutExpired;
                    int  totalTimeout = Latency + data.Timeout;

                    using (Timer timer = new Timer(
                               _ => timeoutExpired = true,
                               state: null,
                               dueTime: totalTimeout,
                               period: Timeout.Infinite))
                    {
                        //reception loop, until a valid response or timeout
                        timeoutExpired = false;
                        while (timeoutExpired == false)
                        {
                            int length = Port.BytesToRead;

                            if (length > 0)
                            {
                                if (length > tempSize)
                                {
                                    length = tempSize;
                                }

                                //read the incoming data from the physical port
                                Port
                                .Read(temp, 0, length);

                                //append data to the writer
                                incoming.WriteBytes(
                                    temp,
                                    0,
                                    length);

                                //try to decode the stream
                                data.IncomingData = incoming.ToReader();

                                CommResponse result = data
                                                      .OwnerProtocol
                                                      .Codec
                                                      .ClientDecode(data);

                                //exit whether any concrete result: either good or bad
                                if (result.Status == CommResponse.Ack)
                                {
                                    return(result);
                                }
                                else if (result.Status == CommResponse.Critical)
                                {
                                    return(result);
                                }
                                else if (result.Status != CommResponse.Unknown)
                                {
                                    break;
                                }
                            }

                            Thread.Sleep(100);

                            //stop immediately if the host asked to abort

                            //TODO
                        }
                    }   //using (timer)
                }       //for

                //no attempt was successful
                return(new CommResponse(
                           data,
                           CommResponse.Critical));
            }   //lock
        }