Random RGB color script for LM Ambient

Code:
math.randomseed(os.time())

function init_color()
    color = {}
    color.r = math.random(0,10)*25
    color.g = math.random(0,10)*25
    color.b = math.random(0,10)*25
    return color
end

function RGB(r,g,b)
    color = 0
    color = bit.lshift(bit.band(r,0xFF),16) + bit.lshift(bit.band(g,0xFF),8) + bit.band(b,0xFF)
    return color
end

function linear(c1,c2,k)
    return (c2 - c1)*k + c1
end

if src == nil then 
    src = init_color()
end

dst = init_color()


time = 4

delay = 0.2

steps = time/delay


k = time / delay
for i = 0,steps do
    r = linear(src.r,dst.r,i/steps)
    g = linear(src.g,dst.g,i/steps)
    b = linear(src.b,dst.b,i/steps)

   end
    
    grp.update('RGB LED',RGB(r,g,b))
    os.sleep(delay)    
    
    
end

src = dst
os.sleep(delay)