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Device Identifier in Thread network

I've 3 FTD nodes (nRF52840 SoC), the network between the nodes and the UDP message transfers are been done successfully.
I want to split and send the messages between the end devices as an event. I've worked with CoAP server-client and able to achieve that as well.
But the problem is, whenever the device attains power cycle, the ip changes so the message gets dropped.
Is there a way to make a static device identifier (IP address) or any other parameter will be helpful for static device identifier?
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