whois = function()
local x,y,z = gps.locate(5)
range = 64 + (y-96) * ((384-64)/(255-96))
rednet.broadcast("Relay at ("..x..","..y..","..z..") has ID "..os.getComputerID().." and range"..range)
print("responded to WHOIS request")
end


rednet.open("back")

history = {}

while true do

id,msg = rednet.receive()
print("received message from "..id)
send = true
for i in history do
	if i == msg then
	send = false
	end
end

if msg == "whois" then
whois()
send = false
end

if send == true then
rednet.broadcast(msg)
table.insert(history, msg)
print("relayed message successfully")
end

end