fix

local Portes = {795, 1639, 1638}
local tArgs = {...}
local x = tonumber(tArgs[1])
local y = tonumber(tArgs[2])
local z = tonumber(tArgs[3])
rednet.open("back")

-- p => player
-- b => block1
-- c => block2
local function checkCoord(px, py, pz, bx, by, bz, cx, cy, cz)
    return (
        (px >= bx or px <= cx) and
        (py >= by or px <= cy) and
        (pz >= bz or px <= cz)
    )
end

while true do
    x = 0
    while x == 0 do
        x, y, z = gps.locate(5)
        if x == 0 then
            print("Can't connect to GPS, retrying in 5 seconds")
            sleep(5)
        end
    end

    if checkCoord(x, y, z, 685.0, 65.0, -586.0, 686.0, 66.0, -587.0) or
            checkCoord(x, y, z, 698.0, 65.0, -588.0, 699.0, 66.0, -589.0) then
        print("Opening ...")
        rednet.send(Portes, "true")
    elseif checkCoord(x, y, z, 687.0, 65.0, -586.0, 688.0, 66.0, -587.0) or
            checkCoord(x, y, z, 696.0, 65.0, -590.0, 697.0, 66.0, -591.0) then
        print("Closing ...")
        rednet.send(Portes, "false")
    end
    sleep(4)
end