Table Of Contents
UDP Write (Binary) (G Dataflow)
Writes a binary datagram to a remote UDP port. To send multicast datagrams, specify the multicast group address in the address input.
Programming Patterns
port or service name
The port or name of the service you want to write to. You can specify a service name to query the NI Service Locator for the port number that the server registered. port or service name can accept a numeric or string input.
What Is the NI Service Locator?
The NI Service Locator stores a list of registered service names and returns a corresponding port number to clients that query for a particular service name.
A client can use a service name to query the NI Service Locator and obtain the port number associated with that service name. Thus, a client does not need to know the port number of a registered service in order to request that service.
The NI Service Locator runs as a background service and requires no user interaction.
Registering Services with the NI Service Locator
Use this input to register a service name and associated port number with the NI Service Locator.
address
The address of the computer where you want to send a datagram. To send multicast datagrams, specify the multicast group address in this input.
This input supports scalar strings and unsigned 32-bit integers.
How Do I Find the Address?
connection ID in
A network connection refnum that uniquely identifies the UDP socket.
data in
The data to write to another UDP socket.
In an Ethernet environment, restrict the datagram to a reasonable size, such as 1,000 bytes. UDP datagrams must be sent as a single IP packet with no retransmission. If the packet is too large to fit in a single transmission unit of the underlying bus, the receiver might fragment and reassemble it, which increases overhead and the chance that the data could be lost in transit. Specific thresholds vary depending on your network.
timeout ms
Time, in milliseconds, that the node waits to complete before reporting a timeout error.
Wire a -1 to this input 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.
Standard Error Behavior
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.
Default: No error
connection ID out
Same value as connection ID in.
error out
Error information.
The node produces this output according to standard error behavior.
Standard Error Behavior
Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.