udpRcvFrom

Description

This function receives a UDP telegram. If the characters are received, the function fills the ADD argument with the internal “UDP” of the sender. This buffer can then be passed to the udpSendTo function to send the answer.

Arguments

Input

En	Description	Execute the function
	Data type	BOOL
	Range	[0,1]
	Unit	N/A
	Default	—
sock	Description	ID of the socket
	Data type	DINT
	Range	[0,+65535]
	Unit	N/A
	Default	—
nb	Description	Maximum number of characters received
	Data type	DINT
	Range	[0,+65535]
	Unit	N/A
	Default	—
add[]	Description	Buffer containing the UDP address of the transmitter (filled on output)
	Data type	USINT
	Range	[0,32]
	Unit	N/A
	Default	—
data	Description	Buffer where to store received characters
	Data type	STRING
	Range	[0,255]
	Unit	N/A
	Default	—

Output

OK	Description	Returns true when the function successfully executes. See Function - General rules.
	Data type	BOOL
	Unit	N/A
Q	Description	Actual number of received characters
	Data type	DINT
	Unit	N/A

Examples

Structured Text

ReceivedBytes := udpRcvFrom(Socket_Number,5,add,data); //Read the position