InactiveMonitor if connection is inactive for the given duration, it will be closed.

WithKeepAlive sets a policy that detects dropped connections within the connTimeout limit while attempting to make 3 pings during that period.

Codec encodes/decodes according to the CoAP content format/media type.

ObservationHandler receives notifications from the observation request.

DecodeFunc can be used to pass in the data type that should be decoded.