Town Lights Program

function printUsage()
    print("Usage:")
    print("lights <on or off>")
    return
end

local tArgs = {...}
local sState = tArgs[1]

if #tArgs <1 then
    printUsage()
end

    --Peripheral Wrapper
    local bOpen, sFreeSide = false, nil
    for n,sSide in pairs(rs.getSides()) do
        if peripheral.getType( sSide ) == "modem" then
            sFreeSide = sSide
            if rednet.isOpen( sSide ) then
                bOpen = true
                break
            end
        end
    end

    if not bOpen then
        if sFreeSide then
            rednet.open( sFreeSide )
            sOpenedSide = sFreeSide
        else
            print( "No modem attached" )
            return
        end
    end

if sState == "on" then
  rednet.broadcast("Light-on")
else
  if sState == "off" then
    rednet.broadcast("Light-off")
  else
    printUsage()
  end
end