TCP Server

Configure TCP server

Since R2020b

• 

Libraries:
Simulink Real-Time / IP

Description

The TCP Server block configures a TCP server.

Examples

Target to Development Computer Communication by Using TCP

Use TCP blocks to send data from the target computer to MATLAB running on the development computer.

• Open Model

Ports

Input

Enable — Connect block to remote Ethernet device

integer

If Enable is greater than zero, the block connects to the Ethernet device. Otherwise, the block does not connect to the Ethernet device.

Output

Status — Device returns a status of not connected or connected

0 | 1

The status value is one of:

• 0 — Not connected

• 1 — Connected

As a best practice, connect the Status output of a TCP configure block to the Enable input of the associated TCP Send and TCP Receive blocks.

Parameters

Use host-target connection — Use Ethernet connection between the development computer and target computers

'off' (default) | 'on'

Dependency

When you select this parameter, it deactivates the Server IP address parameter and excludes the ports 1 through 1023 and 5500 through 5560 from use by TCP.

Programmatic Use

Block Parameter: useHostTargetConn

Server IP address — IP address of the server device that is being configured

x.x.x.x

If you are using a dedicated Ethernet card, this value must match the IP address configured for the Ethernet card on the target computer.

Programmatic Use

Block Parameter: serverAddress

Server port — IP port of the server device that is being configured

1–65535

The combination of Server IP address and Server port must be unique.

Ports 1 through 1023 and 5500 through 5560 are reserved for Simulink Real-Time communications.

Programmatic Use

Block Parameter: serverPort

Use Nagle's algorithm — Enable Nagle's algorithm to combine packets

on (default) | off

Enables Nagle's algorithm to improve the efficiency of the TCP/IP network. Nagle's algorithm reduces the number of packet that are sent over the network. The tradeoff for this improved efficiency is that Nagle's algorithm introduces a delay before a packet is sent over the network. You can reduce network latency by disabling Nagle's algorithm for this block.

Programmatic Use

Block Parameter: useNaglesAlgorithm

Version History

Introduced in R2020b

R2025a: Added parameter to enable or disable Nagle's algorithm

You can reduce network latency (and reduce network efficiency) by disabling Nagle's algorithm for the TCP Client block and TCP Server block. For more information, see the Use Nagle's algorithm block parameter.