redstoneSend

local modem = peripheral.wrap("back")

local redstoneSide = "left"
local channel = 10

local redstoneSignal = false

while true do
    local event = os.pullEvent("redstone")
    redstoneSignal = redstone.getInput(redstoneSide)

    modem.transmit(10, 11, redstoneSignal)

    print("transmitted message: " .. tostring(redstoneSignal))
end