In the link agent, I came across attributes like maxPropagationDelay and reservationGuardTime. What is the role of these attributes? Where I can find more information about these attributes.
These are parameters of specific LINK protocols.
maxPropagationDelay is used to determine timeouts based on expected round-trip-times in the network. It should be set to a value that depends on the geographical size of your network if the network is small enough for a single hop connection between any pair of nodes. Otherwise it should be set to a value based on the maximum communication range of your modem.reservationGuardTime is a small extra time that a channel is reserved for, to allow for practical timing jitter of modems. Usually the default value for this provided by the agent will be good enough for most purposes.The Underwater networks handbook to be released with the upcoming version of UnetStack3 will provide a lot more guidance on many of these parameters, and on how to set up various types of networks using Unetstack.