Send COAP messages from a computer to the nrf5340 CoAP server via my border router. Is that possible? And if So, How?

[kakadua]

I try to connect my nrf5340 CoAP server via my border router with CoAP Messages (with the IP address) from a computer. Is that possible? And if so, How?

I made a border router of my raspberry pi with the guide of OpenThread. I can now ping from my computer to the nrf5340 end device, and I want to make the CoAP client & CoAP server demonstration, but then instead of the CoAP server with the nrf5340, I want to make an internet application that sends the given CoAP messages to turn the LED on or off.

(I'm a little bit of a noob in this sector, so every kind of help is welcome)

Thanks in Advance.

[JONATHAN LL]

Hi, will look in to this an update you on Friday.

Regards,
Jonathan

[kakadua]

Thanks for already updating me about this update! I will look forward to your answer friday

[JONATHAN LL]

Have a update for you, I might not have the perfect answer but should be able to help you along the way. 

If wat you want is to send a CoAP message from a local PC on the same network or a cloud server?
If you have IPv6 connection to the Thread node and the CoAP server then you can just use IPv6 address directly, If you don't have a global IPv6 then you have to use IPv4, here is a link to a previous answer here on Devzone: https://devzone.nordicsemi.com/f/nordic-q-a/61283/how-to-ping-host-pc-from-thread-ftd/249798#249798 


So you need the IP of your DK, you might be able to look it up from the border router. When it comes to the internet application then that is not relay our expertise, but feel free to ask about anything. 

Adding som linke at the bottom here;
https://www.javacodegeeks.com/2018/11/coap-protocol-step-step-guide.html 
https://docs.zephyrproject.org/latest/reference/networking/coap.html#coap-server 
https://devzone.nordicsemi.com/f/nordic-q-a/29063/how-do-i-forward-ipv6-prefix-into-thread-network-to-reach-coap-server 
https://devzone.nordicsemi.com/f/nordic-q-a/27543/how-to-control-coap-client-led-using-coap-server 
https://devzone.nordicsemi.com/f/nordic-q-a/19100/no-ping-between-nrf52-coap-server-and-pc 
https://devzone.nordicsemi.com/f/nordic-q-a/48493/coap-client-application-can-t-reach-nrf52840-coap-server-whereas-ipv6-pings-work 

Regards,
Jonathan

[kakadua]

Thanks! There is only one problem with the coap server example of the nrf SDK. If I add it to the thread network, it doesn't get an IP address with the OMR prefix (a normal CLI example get the OMR prefix, and I could ping it from my local PC). I do not know if you have already answered this question with the links you sent. If so, can you explain what is causing this problem?
Many thanks for considering my request. 

[JONATHAN LL]

Can you share ipconfig from the border router? Since this is a public ticket I recommend that you send me a DM with the ipconfig info, so that you don't share anything you don't want to to the public. 

It might be that the router you is the cause of the issue. 
Older case with related issue: https://devzone.nordicsemi.com/f/nordic-q-a/29063/how-do-i-forward-ipv6-prefix-into-thread-network-to-reach-coap-server 

Regards,
Jonathan