UDP Receive

Receive UDP data

Add-On Required: This feature requires the Embedded Coder Support Package for ARM Cortex-A Processors add-on.

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Libraries:
Embedded Coder Support Package for ARM Cortex-A Processors

Description

The UDP Receive block receives user datagram protocol (UDP) data from a remote host. The block reads available UDP data from the socket buffer and outputs the data as a vector.

Examples

Get Started with Embedded Coder Support Package for ARM Cortex-A Processors

Use Embedded Coder® Support Package for ARM® Cortex-A® Processors to run a Simulink® model on an ARM Cortex-A9 (QEMU) emulator.

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Ports

Output

Port_1 — UDP data received

numeric vector

UDP data received from remote host, returned as a numeric vector. Set the data type of this output by using the Data type for Message parameter.

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

Parameters

To edit block parameters interactively, use the Property Inspector. From the Simulink^® Toolstrip, on the Simulation tab, in the Prepare gallery, select Property Inspector.

To set the block parameter value programmatically, use the set_param function.

To get the block parameter value programmatically, use the get_param function.

Local IP port — IP Port on remote host

25000 (default) | 1 .. 65535

Specify the local IP port number of the application on the hardware board on which you want to receive UDP packets. The port number must be an integer from 1 to 65,535.

Note

On Linux^®, to set the local IP port number below 1024, run MATLAB^® with root privileges. For example, at the Linux command line, enter:

sudo matlab

Programmatic Use

Block Parameter: localPort

Remote IP address ('0.0.0.0' to accept all) — Remote IP address to listen

'0.0.0.0' (default) | valid IP address

Specify the IP address from which the block accepts UDP packets. Entering a specific IP address blocks, UDP packets from other addresses. To accept packets from all IP addresses,use default value '0.0.0.0'.

Programmatic Use

Block Parameter: remoteURL

Receive buffer size (bytes) — Maximum number of data bytes in received data

8192 (default) | positive integer

Specify the size of the buffer size in which you want to store the received UDP packets. Specify the receive buffer size to be large enough to avoid data loss caused by buffer overflows.

Programmatic Use

Block Parameter: recvBufferSize

Maximum length for Message — Maximum length of output UDP data

255 (default) | positive integer

Specify the maximum length of the output UDP data. This value must be greater than or equal to the data size of a UDP packet. The system truncates any data that exceeds this length.

Programmatic Use

Block Parameter: dims

Data type for Message — Data type of output data

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

Select the data type of the output UDP data. This data type must be the same as the data type of UDP message sent by the remote host.

Programmatic Use

Block Parameter: signalDataType

Output variable-size signal — Enable or disable variable output signal size

off (default) | on

Select the Output variable-size signal if your model supports signals for varying length. In this case:

• The output vector varies in length, depending on the amount of data in the UDP data received.

• The block emits the data vector from a single unlabeled output.

Clear the Output variable-size signal if your model does not support signals of varying length. In this case:

• The block emits a fixed-length output of the same length as the Maximum length for Message.

• If the UDP packet contains less data than the fixed-length output, the difference contains invalid data.

• The Data type for length parameter is enabled.

In both cases, the block truncates data that exceeds Maximum length for Message.

Programmatic Use

Block Parameter: isVarSize

Blocking time (seconds) — Time to wait for UDP packet

inf (default) | nonnegative scalar

Specify the duration of wait time for a UDP packet at each sample before returning control to the scheduler.

Programmatic Use

Block Parameter: blockingTime

Sample time (seconds) — Sample time

1 (default) | positive scalar

Specify how often the scheduler runs this block. Setting this parameter to a large value reduces the likelihood of dropped UDP messages.

Programmatic Use

Block Parameter: sampletime

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2014b