Signal CPU

-- this is the startup script for signal computers


----| config |----------------------------


local MODEM_SIDE = "top"
local SIGNAL_SIDE = "back" -- the side connected to the signal
local CENTRAL_CPU_ID = 125 -- the id of the computer at spawn



----| setup |----------------------------


local actionEnum = {
    GET_SIGNAL_STATE = "GET_SIGNAL_STATE",
    SENSOR_CHANGE = "SENSOR_CHANGE",
}


----| functions |----------------------------


function receiveSignal() -- waits for commands from central cpu
    while true do
        print("Waiting for a command...")
        local id, state = rednet.receive()
        if id == CENTRAL_CPU_ID then
            if state == true then -- activate signal
                print("Activating signal...")
                redstone.setOutput(SIGNAL_SIDE, true)
            elseif state == false then -- deactivate signal
                redstone.setOutput(SIGNAL_SIDE, false)
                print("Deactivating signal...")
            end
        end
    end
end


----| main |----------------------------


rednet.open(MODEM_SIDE)
print("Rednet opened.")


-- get the immediate signal state
print("Getting the immediate state...")
rednet.send(CENTRAL_CPU_ID, actionEnum.GET_SIGNAL_STATE)
local id, immediateState = rednet.receive()
redstone.setOutput(SIGNAL_SIDE, immediateState)
print("The signal state is currently set to " .. tostring(immediateState))


-- listen for signal state changes
receiveSignal()