UDP Read

Receive UDP packets from remote host

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Libraries:
SoC Blockset / Processor I/O
SoC Blockset / Host I/O

Description

The UDP Read block receives UDP (User Datagram Protocol) packets from a remote host on the application on target. The remote host is the computer or hardware from which you want to receive UDP packets. The block reads UDP packets from UDP socket buffer and returns the UDP packets as a one-dimensional array.

Ports

Input

msg — UDP packet

numeric vector

This message port receives UDP packets, as messages, from a connected IO Data Source block. The messages process when the Task Manager block triggers task containing the UDP Read block. For more information on messages, see Messages.

Note

This input is used only during simulation. and does nothing in code generation and external mode simulation.

Data Types: SoCData

Output

data — Output UDP packet

numeric vector

Output UDP packet, received from a remote host, returned as a numeric vector.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32

length — Length of received UDP packet

nonnegative scalar

Length of output UDP packet returned on the output data port.

Data Types: uint32

Parameters

Local port — IP port number of local host

25000 (default) | integer from 1 to 65,535

Specify the port number of the application on target in which you want to receive data. Match the local IP port number with the remote IP port number of the remote host.

Data type — Data type of received data

uint8 (default) | single | double | int8 | int16 | int32 | uint16 | uint32

Select the type of data the block receives from the sending host. Match the data type with data type of input data.

Maximum data length (elements) — Maximum length of output UDP packet

1 (default) | positive integer

Specify the maximum number of data elements that the output data port can produce at every time step.

Receive buffer size (bytes) — Number of data bytes in received data

65535 (default) | integer from 1 to 65,535

Specify the maximum number of data bytes that the block can receive at each time step.

Enable event-based execution — Enable or disable event-based task execution

off (default) | on

To generate event-driven code, select this parameter. To generate timer-driven code, clear this parameter.

When Enable event-based execution is selected, the block reads data from the socket buffer whenever any UDP data is received in the socket buffer irrespective of the sample time. When Enable event-based execution is cleared, the block reads available UDP data from the socket buffer at each sample time. To set the size of the data that the block can read from the socket buffer, specify the size in the Receive buffer size parameter.

Sample time — Sample time

-1 (default) | nonnegative scalar

Specify how often the scheduler runs this block. If this value is -1 (default), the scheduler assigns the sample time for the block.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

To automatically generate C code for your design, and execute on an SoC device, use the SoC Builder tool. To generate and execute C code for your SoC models, Embedded Coder^® features are required. For more information on generating code for SoC designs, see Use SoC Builder to Generate SoC Design.

Embedded Coder generates event-driven or timer-driven code for this block, based on the Enable event-based execution parameter selection. This diagram shows a generalized representation of the generated code implementation.

Note

Timing measurements from generated code might vary within the execution of a task instance compared to the timing of tasks in simulation. You can configure your model to use data caching in task signals to reach improved agreement between the simulation and generated code. For more information, see Value and Caching of Task Subsystem Signals.

Version History

Introduced in R2019a