TM4C1294NCPDT *** New port assign to server functionality at run-time and reset.

John Piliounis

Hello to all & to Amit.

Since the EthernetServer my_localServer = EthernetServer(4444); command can be only issued before setup(), and while in setup() we can only issue the my_localServer.begin(); command, it seems that there is no other way to change the server's listening port and then reboot the launchpad with a software reset and read the new listening port from EEPROM and then start the server to the new listening port. Is it so?

Is there any other way to change the server's listening port, with a command at run-time as I do for other parameters like my_localIP, which will be written to EEPROM and then rebooting the launchpad have it running the server onto the new port after reading it from EEPROM?

Thank you very much,

John

over 9 years ago

0 Amit Ashara over 9 years ago

TI__Guru**** 244440 points

Hello John.

Is this the TI RTOS framework that you are using?

0 John Piliounis over 9 years ago in reply to Amit Ashara

Expert 1690 points

Hello Amit.
No, I just use plain C/C++ source for coding my firmware directly to the silicon.
Thank you

0 Amit Ashara over 9 years ago in reply to John Piliounis

TI__Guru**** 244440 points

Hello John

On the underlying layer it is using lwIP. is that correct?

0 John Piliounis over 9 years ago in reply to Amit Ashara

Expert 1690 points

Correct.
So if I get it well, should I need to get into that LIBs and make modifications just for the purpose of my project?

[BTW there is another issue there, with lwIP, that regardless of what MAC one choose to assign in his/her code, that lib always assigns the MAC read from User0 and User1 registers. Clever action to protect from one who wants to mess on purpose or by accident with the local LAN, but not elegant. Seems that modification of that lib addresses the issue if it so badly needed by one]

0 Amit Ashara over 9 years ago in reply to John Piliounis

TI__Guru**** 244440 points

Hello John,

Yes. if the listening port has to be changed the lower level calls to unbind the port from the IP address has to be done before binding it again.

The USER-0 and USER-1 register are not the default for a flash program. The ROM boot loader uses it for sure, but for flash application and boot loaders it can be a soft code as well. Some work of course needs to be done in the library.

0 John Piliounis over 9 years ago in reply to Amit Ashara

Expert 1690 points

Thank you Amit.
So, although I am obliged to bind the EthernetServer with a port before the setup() routine starts, otherwise it can not be started in the setup() routine, you suggest that after I have started it, using then low level calls I can unbind the port from the local module's IP, assign a new port to this IP and then restart the server. Do I get it correctly? Thank you very much. John

0 Amit Ashara over 9 years ago in reply to John Piliounis

TI__Guru**** 244440 points

Hello John,

You are correct. However I stand corrected. You would need to bind the ports required, each with its own buffer and listen to them. There is no unbind construct, but only close connection. You would need to ask the lwIP mailing list if an equivalent unbind exists.

0 John Piliounis over 9 years ago in reply to Amit Ashara

Expert 1690 points

Thank you very much Amit.
I will do so. I'll ask the lwIP ml and I'll see what can be done on the issue.
Again, thank you very much.
John

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TM4C1294NCPDT *** New port assign to server functionality at run-time and reset.