garageCube

It seems that Mad Mapper is sending an Art-Net package without a valid header. The header of the package I receive (only from time to time, and it is not the OP_DMX package) looks like the following:

HEX: 41 72 74 2D 45 78 74 00
Dec: 65 114 116 45 69 120 116 0
Ascii: Art-Ext

But as documented in the specification it should be:

HEX: 41 72 74 2D 4E 65 74 00
Dec: 65 114 116 45 78 101 116 0
Ascii: Art-Net

The OP_CODE of the message is 8193 / 0x33303 which refers to no official Art-Net OP_CODE. The package length is 2048 bytes long.

So could you please help me to understand why you are sending this message and how to interpret it?

Found an answer on my own. It looks like Matthieu has created an own discovery extension for Art-Net which is called Art-Ext:

https://github.com/mattbeghin/Art-Ext-Poll

That's an extension we designed together with Advatek but it's now useless since both Advatek Pixelite & MadMapper are following ArtNet 4 specifications (about polling when a device uses more than 4 universes). We keep it for compatiblity with old Pixelite firmware for a few years and will remove it.