minetest_travelnet_no_free_lunch/restore_network_via_abm.lua

minetest.register_abm({
	nodenames = { "travelnet:travelnet" },
	interval = 20,
	chance = 1,
	action = function(pos)
		local meta = minetest.get_meta(pos)
		local owner_name      = meta:get_string("owner")
		local station_name    = meta:get_string("station_name")
		local station_network = meta:get_string("station_network")

		if owner_name and station_name and station_network
				and not travelnet.get_station(owner_name, station_network, station_name) then
			travelnet.add_target(station_name, station_network, pos, owner_name, meta, owner_name)
			print("TRAVELNET: re-adding " .. tostring(station_name) .. " to " ..
					tostring(station_network) .. " owned by " .. tostring(owner_name))
		end
	end
})