Door Host

os.loadAPI("Toolkit")

rednet.open("back")

pos = {}
offset = {}
offset.x, offset.y, offset.z = 0, -3, 0
pos.x, pos.y, pos.z = gps.locate()
posOff = {}
posOff.x = pos.x + offset.x
posOff.y = pos.y + offset.y
posOff.z = pos.z + offset.z

while true do
    state = true
    id, message, protocol = rednet.receive()
    if protocol == "door" then
        distance = Toolkit.distanceTo(message, posOff)
        if distance < 5 then
            state = false
        end
    end
    redstone.setOutput("bottom", state)
end