As the question implies, I would like to move my AdhocHost in a discrete (100m x 100m) space. That is, for example assume that the node is in (0,0)m, then it waits for one second, and then it "teleports" to (0,1)m, without crossing the distance between the two positions.
How may I do that?
Write a mobility model. Store the actual integer coordinates as the state. Create a timer event that fires on each second, and on that event modify the coordinates according to your rules. You can start from scratch or you may take a look at the stationary mobility module as an example.
About the mobility models in INET: https://inet.omnetpp.org/users-guide/chap22.html