route add -net 224.0.0.0 netmask 240.0.0.0 eth0
Start the slaves to listen:
pwomxplayer --tile-code=41 udp://239.0.1.23:1234?buffer_size=1200000B
Then start the master. Voila!
Use the tile code 40 41 42 43 for 2x2 setup (top left, top right, bottom left, bottom right)
# wall definition for 3x3 screens with bezel compensation
[9bez]
width=5760
height=3240
x=0
y=0
[11]
wall=9bez
width=5760
height=3240
x=0
y=0
# corresponding tile definitions
[91]
wall=9bez
width=1920
height=1080
x=0
y=0
[92]
wall=9bez
width=1920
height=1080
x=1910
y=0
[93]
wall=9bez
width=1920
height=1080
x=3820
y=0
[94]
wall=9bez
width=1920
height=1080
x=0
y=1070
[95]
wall=9bez
width=1920
height=1080
x=1910
y=1070
[96]
wall=9bez
width=1920
height=1080
x=3820
y=1070
[97]
wall=9bez
width=1920
height=1080
x=0
y=2140
[98]
wall=9bez
width=1920
height=1080
x=1910
y=2140
[99]
wall=9bez
width=1920
height=1080
x=3820
y=2140
# config
[9bez]
91=91
92=92
93=93
94=94
95=95
96=96
97=97
98=98
99=99
11=11
[tile]
id=9x (x = screen number)