Method of data transmission in half duplex channel for internet protocol applications

A data transmission method for IP applications over half-duplex channel comprising the steps of:

• STEP. 1 Receive packets from Data link layer of a source IP application using a virtual network software interface to receive ethernet packets information and then fully transmitting the received ethernet packets information to an IPoHD software;
• STEP. 2 Separate, analyze and filter packets in a source system by the IPoHD software separating and analyzing the ethernet packets to get information of each layer in a TCP/IP protocol then deciding which packets will be further processed and which will be discarded based on a supported service;
• STEP. 3 For the Ethernet packets passing through the filter step, Automatically enquire and answer at the source system by analyzing a packet to find out which application and protocol it comes from and then passing the packet to a suitable processing module, the IPoHD software comprises multiple processing modules suitable for different applications (HTTP, SMTP, POP3, FTP, . . . ), when a filtered ethernet packet is received, the IPoHD sends a reply message based on a current state and then moves onto a next state in the processing module;
• STEP. 4 Send data over a half-duplex transmission line, in this step, received data after the enquire and answer procedure will be wrapped and sent to a destination system over a half-duplex transmission line;
• STEP. 5 Separate and analyze packet in the destination system, in this step, the destination system also has an IPoHD to receive and analyze the packet over the half-duplex line;
• from this point, the application will know which application these packets come from to pass them through a suitable processing module;
• STEP. 6 Automatically enquire and answer at the destination system, in this step, processing module correlative with different applications will get received packets communication with a destination IP application through the steps and procedure corresponding to step 3;
• and
• STEP. 7 Send the packet need sending to the destination IP application in step 6 to Data link layer, in this step, IPoHD software in the destination system communicates with the destination IP application going through the virtual network software interface, then the packets are passed to link layer and protocol layers of TCP/IP protocol before lastly reaching the destination IP application.