Access CoAP Server using NAT64

[Markus]

I would like to exchange information via CoAP between my thread end devices and a CoAP server (IPv4) on the internet.

The current Setup: nRF52840 --> Border Router (RPi) --> Internet --> CoAP server

NAT64 is enabled on the border router. The thread end devices can ping IPv4 addresses via the /96 prefix.

ot netdata show
Prefixes:
fdc5:63ee:3a77:1::/64 paos low d400
Routes: 
fdc5:63ee:3a77:2:0:0::/96 paos low d400
2003:f5:bf05:4281::/64 s med d400

Is there any way to access the prefix directly, similar to otThreadGetMeshLocalPrefix function or does the border router need to be reconfigured?

[Susheel Nuguru]

Are you trying to figure out the NAT64 prefix of the border router from the end device in runtime? If so, there are few CLI commands that might be helpful which are mentioned in here. There are some prefix related commands, not sure which one fits you exactly in this case.

[Markus]

The command would be br nat64prefix. But I can only execute it on the border router and not on the thread end device.

[Susheel Nuguru]

You can check this thread which is trying to do the same thing.