farm.lua

local channel = 1
local modem = peripheral.wrap("left")
local transferSide = "right"

modem.open(1)
print("Now listening on channel 1")

function getSeed()
    turtle.forward()
    turtle.digDown()
    turtle.placeDown()
    turtle.back()
    turtle.select(2)
    turtle.transferTo(1)
    turtle.select(1)
end

function replace ()
    getSeed()
    if transferSide == "right" then
        turtle.turnRight()
        turtle.drop()
        turtle.turnLeft()
        transferSide = "left"
    else
        turtle.turnLeft()
        turtle.drop()
        turtle.turnRight()
        transferSide = "right"
    end
end

while true do
    event, side, frequency, replyFrequency, message = os.pullEvent("modem_message")
    rs.setOutput("back", false)
    print(message)
    if message == "finish" then
        print("Seed is now 10/10/10")
        getSeed()
        turtle.dropUp()
    elseif message == "replace" then
        print("Replacing seed")
        replace()
    elseif message == "remove" then
        print("Removing seed")
        getSeed()
        turtle.dropUp()
    end
    rs.setOutput("back", true)
end