def buildPacket(universe, dimmer, dmxdata):
    # Stolen from fire-ohmlogo.py by OHM2013
    size = len(dmxdata) * 3
    #              01234567   8   9   a   b   c   d   e   f   10  11
    #                         op-code protver seq phy universe len
    data = bytearray("Art-Net\x00\x00\x50\x00\x0e\x00\x00",'ascii')
    data.append(int(universe % 256))
    data.append(int(universe / 256))
    data.append(int(size / 256))
    data.append(int(size % 256))
    for (r, g, b) in dmxdata:
        data.append(int(dimmer*r/255))
        data.append(int(dimmer*g/255))
        data.append(int(dimmer*b/255))
    return data