small GTK application interacting via network

Hello everyone
i'm trying to write a small application to control a robot swarm
it takes a cell map from a file, draws the map using a gtk_table where each cell is filled with a colored pixmap. Each cell represents a portion of space where a robot can or cannot stand.
What i am not being able to do is changing the map!
Through tcp/ip connection i can modify the data structure representing each robot, but i do not know how to program the "repaint" of the map after a robot changes its position. It would be enough to change the pixmap associated to a certain position, but i do not know what to do!
Any idea?
Thanks anyway!


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