IP Communication
194
NetLinx Programming Language Reference Guide
When the message is received at 192.168.0.1, the message will be delivered to the
DATA_EVENT
for
dvUDPServer
and the IP address UDP/IP port of the sender of the message will be available in the
DATA.SOURCEIP
and
DATA.SOURCEPORT
variables. A UDP (2) socket would be used in this case to
send a response to the client. Since we will no longer need to listen after sending the response, since
there would be no response to the response, we would open the socket using the following:
IP_CLIENT_OPEN(dvUDPClient,DATA.SOURCEIP,DATA.SOURCEPORT,IP_UDP)
Note that UDP with Receive (3) is only available when calling
IP_CLIENT_OPEN
.
Multicast
NetLinx can send and receive multi-cast UDP messages. To send a multi-cast UDP message, all you
need to do is specify a multi-cast address and port in the
IP_CLIENT_OPEN
function such as the
following:
IP_CLIENT_OPEN (dvIPClient.Port,'239.255.255.250',1900,IP_UDP)
To receive multi-cast UDP messages, you must call the
IP_MC_SERVER_OPEN
function:
IP_MC_SERVER_OPEN (dvIPServer,'239.255.255.250',1900)
The NetLinx master will join the multi-cast session and allow you to receive and transmit UDP multi-
cast messages.
Example IP Code
PROGRAM_NAME='IPExample'
(***********************************************************)
(* DEVICE NUMBER DEFINITIONS GO BELOW *)
(***********************************************************)
DEFINE_DEVICE
dvIPServer = 0:2:0
dvIPClient = 0:3:0
(***********************************************************)
(* CONSTANT DEFINITIONS GO BELOW *)
(***********************************************************)
DEFINE_CONSTANT
nIPPort = 8000
(***********************************************************)
(* VARIABLE DEFINITIONS GO BELOW *)
(***********************************************************)
DEFINE_VARIABLE
IP_ADDRESS_STRUCT MyIPAddress (* .Flags *)
(* .HostName *)
(* .IPAddress *)
(* .SubnetMask *)
(* .Gateway *)
(***********************************************************)
(* STARTUP CODE GOES BELOW *)
(***********************************************************)
Summary of Contents for NETLINX PROGRAMMING LANGUAGE
Page 15: ...Table of Contents xiii NetLinx Programming Language Reference Guide...
Page 16: ...xiv NetLinx Programming Language Reference Guide Table of Contents...
Page 18: ...Introduction 2 NetLinx Programming Language Reference Guide...
Page 76: ...Language Elements 60 NetLinx Programming Language Reference Guide...
Page 106: ...Combining Devices Levels and Channels 90 NetLinx Programming Language Reference Guide...
Page 112: ...Master To Master M2M 96 NetLinx Programming Language Reference Guide...
Page 182: ...Reserved Identifiers 166 NetLinx Programming Language Reference Guide...
Page 204: ...NetLinx UniCode Functions 188 NetLinx Programming Language Reference Guide...
Page 244: ...Appendix B Glossary 228 NetLinx Programming Language Reference Guide...
Page 245: ...Appendix B Glossary 229 NetLinx Programming Language Reference Guide...