SCXI-1124 | NI | Initialize the listening port of the protocol stack

Description

SCXI-1124 | NI | Initialize the listening port of the protocol stack

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When initializing uIP, the uip_init() function is called. Its main function is to initialize the listening port of the protocol stack, SCXI-1124, and set all connections to the closed state. Then the main control part of uIP calls the uiP_input() function, which will process the packet based on the protocol identifier of the packet header and call the upper layer application when needed. When uip_input() returns, an output packet is placed in the same global buffer uip_buf, and its size is assigned to uip_len. If uiP_len is 0, it indicates that there are no packets to be sent. Otherwise, the main control part calls the underlying system’s sending function to send the packet to the network [3].

UIP cycle timing is used to drive all uIP internal clock events. After the cycle timing is triggered, each TCP connection will call the uIP function uip_periodic(). Similar to the uip_input() function, when the uip_periodic() function returns, the output IP packet should be placed in the uip’buf for the underlying system to query the size of the uip_len to determine whether to send it.

Due to the many applications using TCP/IP, SCXI-1124 is implemented as a separate module by the user. Users need to provide the processing function for network packets as an interface to uIP, and define this function as the macro UIP_APPCALL() or UIP_UDP_APPCALL(). UIP_APPCall() is the user’s processing of TCP packets, while UIP_UDP_APPCall() is the user’s processing of UDP packets [4]. In this way, after receiving data packets from the bottom layer, uIP can directly call UIP_APPCall() or UIP_UDP_APPCall() at the location where it needs to be sent to the upper layer application for processing, without the need to modify uIP.

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