I am making an Arduino mod-bus device and I want to make a webpage as well that will allow me to reset the unit if there is any issues remotely. To do this I would need the mod-bus to operate on port 502 and the webpage to operate on port 80. is it possible for the Arduino to support two ports? I am using an Uno with a Ethernet shield and the standard ehternet.h file with a Modbus library. Any suggestions or ideas?
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to test, run two instances of a web server ... one on port 80 and one on port 502 .... access the webpage using two devices so that you are serving a page to two different devices at the same time .... if that works, then try adding some modbus test code (if such a thing exists) instead of a webserver on port 502 – jsotola 9 hours ago
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I tried that and it didn't take the ip address for the webpage but took it for the modbus, and when I added a second instance of the ip to see that would work it errored out. – Michael H. 9 hours ago
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EthernetServer has nothing to do with IP. Servers should run on a different ports on the same IP. – Juraj 3 hours ago
There is no problem to run two EthernetServer instances on different ports. I have a WebServer and a TelnetServer in my project. (Network connection, setup and loop is handled in main ino file.)
