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for more details go through this link https://github.com/WebPlatformForEmbedded/ThunderNanoServices/blob/master/DHCPServer/doc/DHCPServerPlugin.md
For debugging purpose need to select the plugins which are shown as part of Tracing in UI.And check the wpeframework.service logs
journalctl -x -u wpeframework.service
Below picture shows how to select the plugins in UI to get more debug logs
https://github.com/WebPlatformForEmbedded/ThunderNanoServices
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