RGB to separate objects

[tomnord]

Hi. I know I've seen it on the forum before, but could not find it.

To get RGB to work in Google Home, I need to convert RGB (232.600) to separate 1byte values. And also convert the status back from 1byte to 232.600.

[tigi]

Hi, I asked your question to the chatgpt AI and got a working result, hope this works for you too.
Function to convert KNX RGB datatype to separate 1-byte values:

Code:

function knxRGBToBytes(knxRGB)
    local red = bit.rshift(bit.band(knxRGB, 0xFF0000), 16)
    local green = bit.rshift(bit.band(knxRGB, 0x00FF00), 8)
    local blue = bit.band(knxRGB, 0x0000FF)
    return red, green, blue
end
-- Example usage
local knxRGB = grp.getvalue('x/x/x')
local red, green, blue = knxRGBToBytes(knxRGB)
log(red, green, blue)

The other function convert separate 1-byte values to KNX RGB datatype:

Code:

function bytesToKNXRGB(red, green, blue)
    local knxRGB = bit.lshift(red, 16) + bit.lshift(green, 8) + blue
    return knxRGB
end

-- Example usage
local red, green, blue = 255, 102, 51
local knxRGB = bytesToKNXRGB(red, green, blue)
log(string.format("%X", knxRGB))