Net guns invented for crowd control could be adapted to foul up drone props at close range. Civilian and military convoy defenses alike might adapt net guns- possibly making them of larger caliber than .308 to have a defense weapons able to take down small flying drones carrying explosives.
The Navy for some time had Aegis guns that fire a lot of bullets very quickly at incoming missiles. A smaller, cheaper, portable version that fires sticky nets at drones might be innovated for future conflicts. Maybe vehicles travelling as convoys through contested areas should be protected as if they were aircraft carrier battle groups with overlapping airborne protection; and possible some ground based anti-drone sticky net launching platforms with airborne motion sensors or optics analysis for fire control.
