public short Calc_ChecksumOfPacketObj(PacketClass PktObj)
{
short checksum = 0;
foreach (byte chData in PktObj.DeviceId)
{
checksum += chData;
}
foreach (byte chData in PktObj.Password)
{
checksum += chData;
}
foreach (byte chData in PktObj.TypeId)
{
checksum += chData;
}
foreach (byte chData in PktObj.Packet_sno)
{
checksum += chData;
}
foreach (byte chData in PktObj.Continue_Sts)
{
checksum += chData;
}
foreach (byte chData in PktObj.Data)
{
checksum += chData;
}
/* Condition should be added if and only if checksum is greater than 65535(2bytes).*/
// checksum &= 0xff;
return(checksum);
}
public PacketClass DecodeRecievedBytestoPacket_Object(byte[] data)
{
try
{
PacketClass obj = new PacketClass();
/* Need to place the bytes[] into Object */
/* Get the data bytes length */
int data_bytes_len = data.Length - Global.Packet_overhead_len; // Packet_overhead_len is Fixed for all packets but data changes.
int Packet_Checksum_StartIdx = Global.Packet_data_start_Idx + data_bytes_len;
/* Frame Packet Object from byte[] data */
Array.Copy(data, Global.Packet_Header_start_Idx, obj.packetHeader, 0, Global.Packet_Header_len); // Copy PacketHeader
Array.Copy(data, Global.PacketLength_start_Idx, obj.Packet_Length, 0, Global.PacketLength_len); // Copy Length of Packet
Array.Copy(data, Global.Packet_DeviceID_start_Idx, obj.DeviceId, 0, Global.Packet_DeviceID_len); // Copy Device Id of Packet
Array.Copy(data, Global.Packet_Password_start_Idx, obj.Password, 0, Global.Packet_Password_len); // Copy System Password of Packet
Array.Copy(data, Global.Packet_TypeId_start_Idx, obj.TypeId, 0, Global.Packet_TypeId_len); // Copy TYpeID of Packet
Array.Copy(data, Global.Packet_Sno_start_Idx, obj.Packet_sno, 0, Global.Packet_Sno_len); // Copy Packet SNo of Packet
Array.Copy(data, Global.Packet_ContinueSts_start_Idx, obj.Continue_Sts, 0, Global.Packet_ContinueSts_len); // Copy Continue_Sts of th Packet
Array.Copy(data, Global.Packet_data_start_Idx, obj.Data, 0, data_bytes_len); // Copy Data of Packet
Array.Copy(data, Packet_Checksum_StartIdx, obj.Checksum, 0, Global.Packet_Chcksum_len); // Copy Data of Packet
return(obj);
}
catch (Exception ex)
{
DateTime now_time = DateTime.Now;
string time = Convert.ToString(now_time);
Global.AppendTexttoFile(Global.exception_filepath, "Exception Occured in DecodeRecievedBytestoPacket_Object: " + ex.Message + time); // Logging the Execptions Ocuured
return(null);
}
}
public short Calc_ChecksumOfPacketObj(PacketClass PktObj)
{
short checksum = 0;
foreach (byte chData in PktObj.DeviceId)
{
checksum += chData;
}
foreach (byte chData in PktObj.Password)
{
checksum += chData;
}
foreach (byte chData in PktObj.TypeId)
{
checksum += chData;
}
foreach (byte chData in PktObj.Packet_sno)
{
checksum += chData;
}
foreach (byte chData in PktObj.Continue_Sts)
{
checksum += chData;
}
foreach (byte chData in PktObj.Data)
{
checksum += chData;
}
checksum &= 0xff;
return(checksum);
}
private byte[] FrameCommunicationAck(PacketClass PacketObj)
{
try
{
PacketClass AckPacket = new PacketClass();
AckPacket.packetHeader = Global.CommandResponse_pkt_header;
AckPacket.Packet_Length = PacketObj.Packet_Length;
AckPacket.DeviceId = PacketObj.DeviceId;
AckPacket.Password = PacketObj.Password;
AckPacket.TypeId = Global.CommInitAckPkt_TypeID;
AckPacket.Packet_sno = Global.CommInitAckPkt_SNo;
AckPacket.Continue_Sts = Global.CommInitAckContinue_Sts;
AckPacket.Data = new byte[] { }; // Empty Data Feild
short checksum = Calc_ChecksumOfPacketObj(AckPacket);
AckPacket.Checksum = BitConverter.GetBytes(checksum); // Getting Bytes from checksum..
byte[] Final_bytes = ObjectToByteArray(AckPacket); // Serializing Object to Byte Array.
return(Final_bytes); // Returning Serialozed Byte array.
}
catch (Exception ex)
{
DateTime now_time = DateTime.Now;
string time = Convert.ToString(now_time);
Global.AppendTexttoFile(Global.exception_filepath, "Exception Ocuured While FrameCommunicationAck: " + ex.Message + time); // Logging the Execptions Ocuured
return(null);
}
}
public PacketClass Reverse_PacketBytes(PacketClass Packet_obj)
{
Array.Reverse(Packet_obj.packetHeader); // Reversing the Packet Header Bytes
Array.Reverse(Packet_obj.Packet_Length);
Array.Reverse(Packet_obj.DeviceId);
Array.Reverse(Packet_obj.Password);
Array.Reverse(Packet_obj.TypeId);
Array.Reverse(Packet_obj.Packet_sno);
Array.Reverse(Packet_obj.Continue_Sts);
Array.Reverse(Packet_obj.Checksum);
return(Packet_obj);
}
public void ProcessCommInitPacket(PacketClass PacketObj, IPAddress Ipaddr)
{
/* Communication Init Packet */
bool IsDeviceExists = false;
long ParamDeviceId = Convert.ToInt64(PacketObj.DeviceId); // Converting Byte[] Array to Long
for (int i = 0; i <= Devices_Buffer.Count - 1; i++)
{
if (Devices_Buffer[i].DeviceId.Equals(ParamDeviceId))
{
IsDeviceExists = true; /* Comm had failed and it is trying with the new IP. */
/* Check IsConnected */
if (Devices_Buffer[i].IsConnected) // Because Connection_Checking Method still not Removed Old Socket
{
RemoveSocketByusingIP(Devices_Buffer[i].Ipaddr);
}
SocketClass Socketobj = FindSocketbyusingIp(Ipaddr); // To Find the Socket by using new IP Address
if (Socketobj != null)
{
Devices_Buffer[i].IsConnected = true;
Devices_Buffer[i].LastActivetime = DateTime.Now;
Devices_Buffer[i].Ipaddr = Socketobj.IpAddr; // New Ip Address
Devices_Buffer[i].ClientObj = Socketobj.Clientobj; // New Socket
}
/* Frame Ack for Communication Initialization Packet */
byte[] CommAckdata = FrameCommunicationAck(PacketObj);
SendDatatoClient(CommAckdata, Devices_Buffer[i].ClientObj); // Device is Re Connected with new Ip Address
break;
}
}
if (!IsDeviceExists) // If No Device Exists
{
DeviceInfo Device = new DeviceInfo();
Device.DeviceId = ParamDeviceId; // It is Dummy
Device.IsConnected = true;
Device.LastActivetime = DateTime.Now;
SocketClass Socketobj = FindSocketbyusingIp(Ipaddr); // To Find the Socket by using new IP Address
Device.Ipaddr = Socketobj.IpAddr;
Device.ClientObj = Socketobj.Clientobj;
Devices_Buffer.Add(Device); // Adding New Device to the Devices_buff
/* Frame Ack for Communication Initialization Packet */
byte[] CommAckdata = FrameCommunicationAck(PacketObj);
SendDatatoClient(CommAckdata, Device.ClientObj); // Device is New & Sending Bytes to the Client (Device ).
}
}
public byte[] GetFinalbytesOfCommand(byte[] Deviceid, byte[] Command_Pkt_TypeID, byte[] databytes)
{
/* Prepare PacketObject */
PacketClass PktObj = FramePacketforCommand(Deviceid, Global.Command_KeyCodePkt_TypeID, databytes);
/* Calculating Length of the PAcket */
short length = (short)(Global.Packet_Default_length + PktObj.Data.Length);
PktObj.Packet_Length = BitConverter.GetBytes(length); // Getting Bytes from checksum.. Length
ushort Chksum = ServerClass.Calc_ChecksumForCommandObj(PktObj); // Calculates Checksum Of the Packet
PktObj.Checksum = BitConverter.GetBytes(Chksum); //Checksum
PktObj = ServerClass.Reverse_PacketBytes(PktObj); // Reversing the Object byte[] arrays
byte[] Final_bytes = ServerClass.PktObjectToByteArray(PktObj); // Convering Object to byte[] array.
return(Final_bytes);
}
public static byte[] PktObjectToByteArray(PacketClass obj)
{
try
{
/* Need to place the bytes[] into Object */
/* Get the data bytes length */
int array_len = 0;
array_len = Global.Packet_overhead_len; // Asumming Packet has no data.
int data_bytes_len = obj.Data.Length; // Packet_overhead_len is Fixed for all packets but data changes.
if (data_bytes_len > 0) /* Packet has Some Databyte need to change the length */
{
array_len = array_len + data_bytes_len;
}
/* Creating new Array */
byte[] Ack_bytes = new byte[array_len];
int Packet_Checksum_StartIdx = Global.Packet_data_start_Idx + data_bytes_len;
/* Frame Packet Object from byte[] data */
Array.Copy(obj.packetHeader, 0, Ack_bytes, Global.Packet_Header_start_Idx, Global.Packet_Header_len); // Copy PacketHeader
Array.Copy(obj.Packet_Length, 0, Ack_bytes, Global.PacketLength_start_Idx, Global.PacketLength_len); // Copy Length of Packet
Array.Copy(obj.DeviceId, 0, Ack_bytes, Global.Packet_DeviceID_start_Idx, Global.Packet_DeviceID_len); // Copy Device Id of Packet
Array.Copy(obj.Password, 0, Ack_bytes, Global.Packet_Password_start_Idx, Global.Packet_Password_len); // Copy System Password of Packet
Array.Copy(obj.TypeId, 0, Ack_bytes, Global.Packet_TypeId_start_Idx, Global.Packet_TypeId_len); // Copy TYpeID of Packet
Array.Copy(obj.Packet_sno, 0, Ack_bytes, Global.Packet_Sno_start_Idx, Global.Packet_Sno_len); // Copy Packet SNo of Packet
Array.Copy(obj.Continue_Sts, 0, Ack_bytes, Global.Packet_ContinueSts_start_Idx, Global.Packet_ContinueSts_len); // Copy Continue_Sts of th Packet
Array.Copy(obj.Data, 0, Ack_bytes, Global.Packet_data_start_Idx, data_bytes_len); // Copy Data of Packet
Array.Copy(obj.Checksum, 0, Ack_bytes, Packet_Checksum_StartIdx, Global.Packet_Chcksum_len); // Copy Checksum of Packet
return(Ack_bytes); // Returning Ack bytes
}
catch (Exception ex)
{
DateTime now_time = DateTime.Now;
string time = Convert.ToString(now_time);
Global.AppendTexttoFile(Global.exception_filepath, "Exception Occured in ObjectToByteArray: " + ex.Message + time); // Logging the Execptions Ocuured
return(null);
}
}
private byte[] FrameCommunicationAck(PacketClass PacketObj)
{
try
{
AckClass AckPacket = new AckClass();
AckPacket.packetHeader = Global.CommInitResponse_pkt_header;
// Length ?? 18
// AckPacket.Packet_Length = PacketObj.Packet_Length; { Should not do like this beacuse it is going to change Original object }
PacketObj.Packet_Length.CopyTo(AckPacket.Packet_Length, 0);
PacketObj.DeviceId.CopyTo(AckPacket.DeviceId, 0);
PacketObj.Password.CopyTo(AckPacket.Password, 0);
Global.CommInitAckPkt_TypeID.CopyTo(AckPacket.TypeId, 0);
Global.CommInitAckPkt_SNo.CopyTo(AckPacket.Packet_sno, 0);
Global.CommInitAckContinue_Sts.CopyTo(AckPacket.Continue_Sts, 0);
AckPacket.Data = new byte[] { }; // Empty Data Feild
short checksum = Calc_ChecksumOfAckPacketObj(AckPacket);
AckPacket.Checksum = BitConverter.GetBytes(checksum); // Getting Bytes from checksum..
AckPacket = Reverse_AckPacketBytes(AckPacket); // Reversing the AckPacket Object Is Causing the Device Id in Reverse
byte[] Final_bytes = ObjectToByteArray(AckPacket); // Serializing Object to Byte Array.
return(Final_bytes); // Returning Serialozed Byte array.
}
catch (Exception ex)
{
DateTime now_time = DateTime.Now;
string time = Convert.ToString(now_time);
Global.AppendTexttoFile(Global.exception_filepath, "Exception Ocuured While FrameCommunicationAck: " + ex.Message + time); // Logging the Execptions Ocuured
return(null);
}
}
public PacketClass DecodeRecievedBytestoPacket_Object(byte[] data)
{
PacketClass obj = new PacketClass();
/* Need to place the bytes[] into Object */
/* Get the data bytes length */
int data_bytes_len = data.Length - Global.Packet_overhead_len; // Packet_overhead_len is Fixed for all packets but data changes.
/* Frame Packet Object from byte[] data */
Array.Copy(data, Global.Packet_Header_start_Idx, obj.packetHeader, 0, Global.Packet_Header_len); // Copy PacketHeader
Array.Copy(data, Global.PacketLength_start_Idx, obj.Packet_Length, 0, Global.PacketLength_len); // Copy Length of Packet
Array.Copy(data, Global.Packet_DeviceID_start_Idx, obj.DeviceId, 0, Global.Packet_DeviceID_len); // Copy Device Id of Packet
Array.Copy(data, Global.Packet_Password_start_Idx, obj.Password, 0, Global.Packet_Password_len); // Copy System Password of Packet
Array.Copy(data, Global.Packet_TypeId_start_Idx, obj.TypeId, 0, Global.Packet_TypeId_len); // Copy TYpeID of Packet
Array.Copy(data, Global.Packet_Sno_start_Idx, obj.Packet_sno, 0, Global.Packet_Sno_len); // Copy Packet SNo of Packet
Array.Copy(data, Global.Packet_ContinueSts_start_Idx, obj.Continue_Sts, 0, Global.Packet_ContinueSts_len); // Copy Continue_Sts of th Packet
Array.Copy(data, Global.Packet_data_start_Idx, obj.Data, 0, Global.Packet_data_len); // Copy Data of Packet
Array.Copy(data, Global.Packet_Checksum_Idx, obj.Checksum, 0, Global.Packet_Chcksum_len); // Copy Data of Packet
return(obj);
}
public PacketClass Reverse_PacketBytes(PacketClass Packet_obj)
{
try
{
Array.Reverse(Packet_obj.packetHeader); // Reversing the Packet Header Bytes
Array.Reverse(Packet_obj.Packet_Length);
Array.Reverse(Packet_obj.DeviceId);
Array.Reverse(Packet_obj.Password);
Array.Reverse(Packet_obj.TypeId);
Array.Reverse(Packet_obj.Packet_sno);
Array.Reverse(Packet_obj.Continue_Sts);
Array.Reverse(Packet_obj.Checksum);
return(Packet_obj);
}
catch (Exception ex)
{
DateTime now_time = DateTime.Now;
string time = Convert.ToString(now_time);
Global.AppendTexttoFile(Global.exception_filepath, "Exception Occured in Reverse_PacketBytes: " + ex.Message + time); // Logging the Execptions Ocuured
return(null);
}
}
public PacketClass FramePacketforCommand(byte[] Deviceid, byte[] Command_Pkt_TypeID, byte[] databytes)
{
PacketClass Obj = new PacketClass();
Global.Command_pkt_header.CopyTo(Obj.packetHeader, 0); // Packet Header
Deviceid.CopyTo(Obj.DeviceId, 0); // Device Id
Global.SystemPassword.CopyTo(Obj.Password, 0); // System Password
Command_Pkt_TypeID.CopyTo(Obj.TypeId, 0); // TypeID
if (Command_Pkt_TypeID.SequenceEqual(Global.Command_KeyCodePkt_TypeID))
{
Global.Command_KeyCodePkt_Sno.CopyTo(Obj.Packet_sno, 0); // Packet Serial Numbr
Global.Command_KeyCodePkt_ContSts.CopyTo(Obj.Continue_Sts, 0); // Packet Continue Sts
}
Obj.Data = new byte[databytes.Length];
databytes.CopyTo(Obj.Data, 0); // Data
return(Obj);
}
public void ProcessDataBuffer(object sender, ElapsedEventArgs elapsedEventArg) // To Process the DataBuffer
{
try
{
if (!Global.Is_dataprocessing) // If No dataprocessing beore the
{
Global.Is_dataprocessing = true; // It Is a Lock For this Procedure
if (Data_Buffer != null) // If Data Buffer has some data elements
{
while (Data_Buffer.Count > 0)
{
DataClass data_item = Data_Buffer.Take(); // Takes the first data_item from the Data_Buffer Queue.
bool Is_IpExists = false; // Mark it as IP has not existed with data_item ip address
for (int i = 0; i <= Sockets_arr.Count - 1; i++)
{
if (Sockets_arr[i].IpAddr.Equals(data_item.Ip_addr))// If Ip_Exists In Connected IPs List
{
Is_IpExists = true;
break;
}
}
if (Is_IpExists) // I.e If Ip Exists So that Only you need to process otherwise discard it
{
if (data_item.data.Length <= Global.Max_bytes && data_item.data.Length >= Global.Min_bytes) // Valid databyte
{
PacketClass Packet_obj = DecodeRecievedBytestoPacket_Object(data_item.data); // Decoding bytes Array into Packetclass
Packet_obj = Reverse_PacketBytes(Packet_obj); // Reversing the Packet_obj Except DataBytes.
short cal_checksum = Calc_ChecksumOfPacketObj(Packet_obj); // Pasing the Packet object to calculate checksum;
bool Is_valid = IsValidPacket(Packet_obj.Checksum, Packet_obj.Password, Packet_obj.DeviceId, cal_checksum); // Verifies Checksum, DeviceID
if (Is_valid) // I.e Recieved Pakcet Is Valid
{
if (Packet_obj.packetHeader.SequenceEqual(Global.CommInit_pkt_header))
{
ProcessCommInitPacket(Packet_obj, data_item.Ip_addr); // Communication Initialization Packet
}
else if (Packet_obj.packetHeader.SequenceEqual(Global.CommInitResponse_pkt_header))
{
ProcessCommandResponsePacket(Packet_obj, data_item.Ip_addr); // Command Response Packet
}
else if (Packet_obj.packetHeader.SequenceEqual(Global.Event_pkt_header))
{
ProcessEventPacket(Packet_obj, data_item.Ip_addr); // Event Packet
}
else if (Packet_obj.packetHeader.SequenceEqual(Global.Event_pkt_header))
{
ProcessModuleAlivePacket(Packet_obj, data_item.Ip_addr); // Module Alive Packet
}
}
}
}
}
}
Global.Is_dataprocessing = false;
}// End of Isdataprocessing
}
catch (Exception ex)
{
DateTime now_time = DateTime.Now;
string time = Convert.ToString(now_time);
Global.AppendTexttoFile(Global.exception_filepath, "Exception Ocuured on PrcoessDataBuffer: " + ex.Message + time); // Logging the Execptions Ocuured
Global.Is_dataprocessing = false;
}
}
public void ProcessModuleAlivePacket(PacketClass PacketObj, IPAddress Ipaddr)
{
/* Module Alive Packet */
}
public void ProcessEventPacket(PacketClass PacketObj, IPAddress Ipaddr)
{
/* Event Packt */
}
public void ProcessCommandResponsePacket(PacketClass PacketObj, IPAddress Ipaddr)
{
/* Command Response Packet */
}
public void ProcessCommInitPacket(PacketClass PacketObj, IPAddress Ipaddr)
{
/* Communication Init Packet */
try
{
bool IsDeviceExists = false;
for (int i = 0; i <= Devices_Buffer.Count - 1; i++)
{
if (Devices_Buffer[i].DeviceId.SequenceEqual(PacketObj.DeviceId))
{
IsDeviceExists = true; /* Comm had failed and it is trying with the new IP. */
/* Check IsConnected */
if (Devices_Buffer[i].IsConnected) // Because Connection_Checking Method still not Removed Old Socket
{
RemoveSocketByusingIP(Devices_Buffer[i].Ipaddr);
}
SocketClass Socketobj = FindSocketbyusingIp(Ipaddr); // To Find the Socket by using new IP Address
if (Socketobj != null) // Socketobj will be null when same IP requests
{
Devices_Buffer[i].IsConnected = true;
Devices_Buffer[i].LastActivetime = DateTime.Now;
Devices_Buffer[i].Ipaddr = Socketobj.IpAddr; // New Ip Address
// Devices_Buffer[i].ClientStream.Close(); // To Close the Previous Network Stream bw Client & Server.
Devices_Buffer[i].ClientStream = Socketobj.Clientobj.GetStream(); // New Socket Stream
/* Frame Ack for Communication Initialization Packet */
byte[] CommAckdata = FrameCommunicationAck(PacketObj);
SendDatatoClient(CommAckdata, Devices_Buffer[i].ClientStream); // Device is Re Connected with new Ip Address
}
break;
}
}
if (!IsDeviceExists) // If No Device Exists
{
DeviceInfo Device = new DeviceInfo();
Device.DeviceId = new byte[PacketObj.DeviceId.Length]; // Need to Initialize the DeviceID array
PacketObj.DeviceId.CopyTo(Device.DeviceId, 0); // It is Dummy
Device.IsConnected = true;
Device.LastActivetime = DateTime.Now;
SocketClass Socketobj = FindSocketbyusingIp(Ipaddr); // To Find the Socket by using new IP Address
Device.Ipaddr = Socketobj.IpAddr;
Device.ClientStream = Socketobj.Clientobj.GetStream();
Devices_Buffer.Add(Device); // Adding New Device to the Devices_buff
/* Frame Ack for Communication Initialization Packet */
byte[] CommAckdata = FrameCommunicationAck(PacketObj);
// Don't know why DeviceID is getting reversed when i reverse the DeviceID in AckPacket
// Array.Reverse(Device.DeviceId);
SendDatatoClient(CommAckdata, Device.ClientStream); // Device is New & Sending Bytes to the Client (Device ).
}
}
catch (Exception ex)
{
DateTime now_time = DateTime.Now;
string time = Convert.ToString(now_time);
Global.AppendTexttoFile(Global.exception_filepath, "Exception Ocuured in ProcessCommInitPacket: " + ex.Message + time); // Logging the Execptions Ocuured
}
}
