Invalid header message when receiving broadcast from MadMapper

[cansik]

When receiving broadcast messages from MadMapper, sometimes following error occurs:

Mar 09, 2018 10:24:10 PM ch.bildspur.artnet.packets.ArtNetPacketParser parse
WARNING: invalid header

[cansik]

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.

[cansik]

It is an art-net extension by Garagecube them self:
https://github.com/mattbeghin/Art-Ext-Poll