Table Of Contents

UDP Open Connection (G Dataflow)

Last Modified: March 10, 2017

Opens a UDP socket on the port or service name you provide. Close the socket with the UDP Close Connection node. Use the UDP Multicast Open Connection node instead of this one to open connections capable of reading and writing.

Programming Patterns

net address

Network address to listen on. Specifying an address is useful if you have more than one network card, such as two Ethernet cards, and want to listen only on the card with the specified address. If you do not specify a network address, this node listens on all network addresses. Use the String to IP Address node to obtain the IP network address of the current computer.

This input supports scalar strings and unsigned 32-bit integers.

Default: 0



The local port with which you want to create a UDP socket.


service name

Name you want to assign to the service. The node creates a known reference for the port number. If you specify a service name, this node registers the service name and the port number with the NI Service Locator.


timeout ms

Time, in milliseconds, that the node waits to complete before reporting a timeout error. A value of -1 indicates to wait indefinitely.

Default: 25,000 ms


error in

Error conditions that occur before this node runs. The node responds to this input according to standard error behavior.

Default: No error


connection ID

A network connection refnum that uniquely identifies the connection. Use this value to refer to this connection in subsequent node calls.


actual port

Port number the node used. If the input port is not zero, the output port number equals the input port number. Wire 0 to the port input to dynamically choose an available UDP port the operating system determines is valid for use. As defined by the Internet Assigned Numbers Authority (IANA), valid port numbers are between the range of 49152 through 65535. Well Known Ports are between the range of 0 through 1023 and Registered Ports are between the range of 1024 through 49151. Not all operating systems follow the IANA standard. For example, Windows returns dynamic ports between the range of 1024 through 5000.


error out

Error information. The node produces this output according to standard error behavior.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

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