Potintial UDP library conflect

Projects Programming
1

Hi Arduino smart people:

Building a ESP32 project, I'd like to add UDP support to communicate with other machines on my network.

Accidentally, without adding "#include <WiFiUDP.h>" I added a line to create an instance, thus...
"WiFiUDP relayUDP;"

It surprised me that this instance creation did not fail, but, OK...
However, I am unable to use the relayUDP.

Looking around, I noted another WiFiUDP instance, "WiFiUDP ntpUDP;"

I had added "#include <NTPClient.h>", and in that file there is an #include <Udp.h>.
Earlier I had added and debugged getting time using NTPClient.h.

So, I am thinking Udp.h may support some functions in WiFiUDP.h, but either implement them differently or not handle all I need.

  1. What would be the recommended solution to this? (This isn't the first time I have run across multiple libraries that have the same function names in them.)

  2. Are WiFiUDP.h and Udp.h totally interchangeable? (I suspect not.) Is one "superior" to the other? can I simply use WiFiUDP.h in place of Udp.h? (again, I suspect not.)

  3. If I include WiFiUDP.h...

    a) How can I differentiate between using the two WiFiUDP instances?

    b) What other functions will conflict?

Thanks for any insight to this problem.

Mark.

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