OpenThread and IPV6 address

[farhangj]

Hi,
I'm new to OpenThread and IPV6 networking. Using Zephyr 2.6.x (nRF NCS 1.6.x) and nRF52840DK.

I understand how CONFIG_NET_CONFIG_MY_IPV6_ADDR is used in examples to set the device to a static IP address, e.g. "2001:db8::1" for a server and "2001:db8::2" for the client.

But in real-world, I have a mesh network of devices and I want them to use the randomly assigned Mesh-Local EID (ML-EID) when sending CoAP requests, so that the server can then reply back.

The problem is CONFIG_NET_CONFIG_MY_IPV6_ADDR define is used in a few spots in the lower levels e.g. subsys/net/ip/tp.c and susbys/net/lib/config/init.c. Therefore I can't set the IP address in runtime (not without modifying those files, which seems not logical to do).

Why do I want to use ML-EID IP address as each nodes IP address?

• Because I don't want to have to manually rebuild zephyr with new CONFIG_NET_CONFIG_MY_IPV6_ADDR
• also this is the address which "should be used by application" according to Thread spec

OR perhaps I should use SLAAC?

Any pointers would be great, thanks.