Snad

rednet.open("right")

local sender, message, protocol = rednet.receive()

while true do

if message == "canaOn" then
  redstone.setOutput("front", true)
  sleep(0.1)
  redstone.setOutput("front", false)
  sleep(0.1)
end

if message == "canaOff" then
  redstone.setOutput("front", false)
 end
end