Implement resource directory (RD) server

Description

Implement a resource directory (RD) service on Linux to centrally store resource as they are being announced to the network. Allow queries on resource types and keep data up-to-date.

RD service based on libcoap on Linux
Systemd service unit for RD
Keep data up-to-date (e.g. alive timer after initial addition, alive timers, etc)
Enhance command line utility to query RD and display its data

Edited Mar 31, 2022 by Francesco Pham

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