Chicken wings on the grill are easy, so long as the heat is at medium (275-300f) you will get a crispy skin.
Coated with rub, directly over coals, 20 minutes per side (cover down) or until the skin is crispy.
Our house rub is: smoky paprika, chili powder, onion powder, garlic powder, (dried thyme if there is any) and turbinado sugar.
Happy grilling!