[wakaama-dev] Should observation be forced to reply to server ip address

[Ezequiel Santamaría Navarro <zesn@xxxxxxx>]

I'm about to integrate Wakaama client with IoTAgent from Telefonica I+D, 
which is hosted here:

https://github.com/telefonicaid/lightweightm2m-iotagent

But each observation requests from the IoTAgent uses a different port 
than the registration one.

By default a Wakaama client can connect to an IoTAgent using 60001, but 
observation requests doesn't come from port 60001.

I can't find at CoAP RFC7641 that constraint.

Which solution is the correct one? Should Wakaama reply to different 
ports? Should IoTAgent send request from the same as registration port?