If the truss is tight against the wall no hanger is needed for the truss to support the weight it is engineered to take. To counter the slight movement of the truss going down if a weight equal to its max load is put upon it flexing the support boards in the truss which would push the bottom down slightly, only a minor hanger or a few nails would be needed because the majority of weight is supported through the pressure against the wall.
Pressure keeps the entire deck up, nails from pressure supports into home inconsequential. But normal screws or lag bolts into home at porch level holding the deck beams or joists to the home still needed.