I have a timer "tmr_sendCesta" which must be called each x seconds between 1 and 3 seconds. The problem is the timer "tmr_sendCesta" is called only one time, and the random seconds is never updated. I need to call the function "createCesta" each x seconds randomly.

Any idea how to do it?

function createCesta()
    cesta = display.newImageRect("cesta.png", 100, 55)
    cesta.x = -110
    cesta.y = screenH - 110
    cesta.name = "cesta"
    physics.addBody( cesta, physicsData:get("cestaSmall")) 
    grupoCesta:insert(cesta)
    transition.to(cesta, {time = 4000, x = screenW + 110})
end


function scene:enterScene( event )
    local group = self.view
    physics.start()
    Runtime:addEventListener("touch", touchScreen)
    Runtime:addEventListener( "collision", onCollision )

    tmr_sendCesta = timer.performWithDelay((math.random(1000, 3000), randomCesta, 0)
end