Jetter JVM-407B-HMI, User Manual

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Jetter AG 229
JVM-407B Programming
Receiving data
Data can be sent via a previously established TCP/IP connection or via a
UDP/IP connection of a server.
Via UDP/IP connection of a client data can not be received, but only sent.
Function ConnectionReceiveData(IPConnection:Int,
Ref IPAddr:Int,
Ref IPPort:Int,
Ref ReceiveData,
DataLen:Int,
Timeout:Int):Int;
Description of the function parameters:
Parameter Value Comment
IPConnection
Handle Outcome of the function
ConnectionCreate()
IPAddr
Address of a variable for
saving the IP address of
the sender
Required only for UDP/IP
server
IPPort
Address of a variable for
saving the IP port number
of the sender
Required only for UDP/IP
server
ReceiveData
Address of the data block
to be received
DataLen
1 ... 4,000 Maximum data block length
in bytes
Timeout
0 ... 1,073,741,824 [ms] 0 = infinitely
The following return values are possible:
Return value
> 0 Number of received data bytes
-1 Error when receiving data, e.g. connection interrupted
-3 Invalid handle, e.g. receiving data via a UDP/IP client
-8 Timeout
Introduction
Function declaration
Function parameters
Return value