basdim

function hasTeleFocus()
    return turtle.getItemCount(1) ~= 0
end

function acceptItems(accept)
    redstone.setOutput("left", not accept)
end

function isSource()
    return redstone.getInput("back")
end

function getOtherFocus()
    acceptItems(false)
    turtle.dropDown()
 print("Pushing item to chest")
    -- Source should allow target some time to
    -- fetch other focus. 3s should be enough.
    if isSource() then
  print("Waiting for target")
        os.sleep(3)
 end

    while not turtle.suckDown() do
        os.sleep(1)
 end
 print("Got other focus")

    turtle.dropUp()
    acceptItems(true)
end

function triggerTeleport()
 print("Triggering teleport")
    redstone.setOutput("top", true)
    os.sleep(1)
    redstone.setOutput("top", false)
end

while true do
    if hasTeleFocus() then
  print("Have foci")
        getOtherFocus()

    if isSource() then
        triggerTeleport()
  end
 end
 os.sleep(1)
end