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Home » Eclipse Projects » 4DIAC - Framework for Distributed Industrial Automation and Control » TCP/IP or UDP/IP communication for different network segments
TCP/IP or UDP/IP communication for different network segments [message #1795368] Fri, 21 September 2018 03:57 Go to next message
Barry wan is currently offline Barry wanFriend
Messages: 40
Registered: July 2017
Member
Dear all,

Can two devices with forte communicate over TCP/IP or UDP/IP if they are in different network segments?
Re: TCP/IP or UDP/IP communication for different network segments [message #1795374 is a reply to message #1795368] Fri, 21 September 2018 05:43 Go to previous messageGo to next message
Alois Zoitl is currently offline Alois ZoitlFriend
Messages: 866
Registered: January 2014
Senior Member
Hi,

if you use TCP this works because of the features of TCP. UDP will not work as the "IEC 61499 compliance profile for feasibility demonstrations" defines for the UDP usage (publish/subscribe) a TTL of value of 1. That means that it will not cross network segment boundaries. Depending on your use case maybe then using another protocol like OPC UA or MQTT would be an option for you. With TCP and MQTT we made already experiments to communicate with entities in a cloud. This should also work with OPC UA but I haven't looked into it.
Re: TCP/IP or UDP/IP communication for different network segments [message #1795376 is a reply to message #1795374] Fri, 21 September 2018 06:10 Go to previous message
Barry wan is currently offline Barry wanFriend
Messages: 40
Registered: July 2017
Member
thank you ,Alois.
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