rednet.broadcast() functionality for peripheral.wrap()

i have my peripheral wrap set up with a wirless modem and i am stuck on the general broadcast function
my code for so far is this:

wifi = peripheral.wrap("left")
lan = peripheral.wrap("top")
wifi.open(2220)
lan.open(1110)
while true do
	local event, value1, value2, value3, value4, value5 = os.pullEvent()
	if event == "modem_message" then
		if string.sub(value4,0,5) == "wifi#" or string.sub(value4,0,4) == "lan#" then
			rednetArr = split(value4,"#")
			if #rednetArr == 1 then
				lan.transmit( value3, 1110,"error ocured while sending1")
			elseif #rednetArr == 2 then
				if rednetArr[1] == "wifi" then
					wifi.broadcast(rednetArr[2])
				else
					lan.transmit( value3, 1110,"error ocured while sending2")
				end
			elseif #rednetArr == 3 then
				if rednetArr[1] == "wifi" then
					wifi.transmit(tonumber(rednetArr[2]), 2220,rednetArr[3])
				else
					lan.transmit(tonumber(rednetArr[2]), 1110,rednetArr[3])
				end
			elseif #rednetArr == 4 then
				-- specific pc and protocol
			end
		end
	end
end

with most of the other code gone to get it clear, the problem is on line 14 where wifi.broadcast() is called.
how can i get a way to reach the whole spectrum without using rednet.

When you wrap a modem directly, with peripheral.wrap, you get the Modem API:
http://www.computercraft.info/wiki/Modem_(API)

When you use rednet.open("side"), you use the Rednet API:
http://computercraft.info/wiki/Rednet_(API)


The modem API only has 1 function related to sending messages: transmit(channel,replyChannel,message)
Any computer listening on 'channel' gets a "modem_message" event.
Arguments are modemSide, channel, replyChannel, message, distance

When you call rednet.open(), basically all it's doing is:

modem.open( os.getComputerID() )
modem.open( 65535 )

When you call rednet.broadcast(), the end result boils down to:

rednet.send(65535, message)