I had some firewall configuration problems preventing successful multicast
packet exchange between my test machines, but I got that sorted out by
temporarily just disabling the firewall on one machine.

This is the output I see from each machine.

On machine with USB interface attached (jackd master):

]$ /usr/bin/jackd -P70 -t2000 -dalsa -dhw:Lambda -r48000 -p1024 -n3 -Xseq
-zt -I376 -O376
jackdmp 1.9.10
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2014 Grame.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
no message buffer overruns
no message buffer overruns
no message buffer overruns
JACK server starting in realtime mode with priority 70
self-connect-mode is "Don't restrict self connect requests"
audio_reservation_init
Acquire audio card Audio0
creating alsa driver ...
hw:Lambda|hw:Lambda|1024|3|48000|0|0|nomon|swmeter|-|32bit
configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 3 periods
ALSA: final selected sample format for capture: 24bit little-endian
ALSA: use 3 periods for capture
ALSA: final selected sample format for playback: 24bit little-endian
ALSA: use 3 periods for playback
Using port names patch v0.1 (07.04.2010)
Trying to load portnames from /home/chris/.config/jack/cards/Lexicon
Lambda.ss.ports.in
Trying to load portnames from /home/chris/.config/jack/cards/Lexicon
Lambda.ports.in
Trying to load portnames from /etc/jack/cards/Lexicon Lambda.ss.ports.in
Trying to load portnames from /etc/jack/cards/Lexicon Lambda.ports.in
Trying to load portnames from /home/chris/.config/jack/cards/Lexicon
Lambda.ss.ports.out
Trying to load portnames from /home/chris/.config/jack/cards/Lexicon
Lambda.ports.out
Trying to load portnames from /etc/jack/cards/Lexicon Lambda.ss.ports.out
Trying to load portnames from /etc/jack/cards/Lexicon Lambda.ports.out
port created: Midi-Through:midi/playback_1
port created: Midi-Through:midi/capture_1
port created: Lexicon-Lambda:midi/playback_1
port created: Lexicon-Lambda:midi/capture_1

--------------------
in separate console loaded netmanager at this point.
output from netmanager load:
$ jack_load netmanager
netmanager is running.
client name = netmanager
--------------------

Starting Jack NetManager
Listening on '225.3.19.154:19000'

---------------------
slave machine jackd started at this point
This is still output from master side, just making a timing notation
---------------------

Takes physical 2 audio input(s) for slave
Takes physical 2 audio output(s) for slave
Takes physical 2 MIDI input(s) for slave
Takes physical 2 MIDI output(s) for slave
Sending parameters to oldchubb...
New NetMaster started
**************** Network parameters ****************
Name : oldchubb
Protocol revision : 8
MTU : 1500
Master name : chubb.cc-net
Slave name : oldchubb
ID : 1
Transport Sync : no
Send channels (audio - midi) : 2 - 2
Return channels (audio - midi) : 2 - 2
Sample rate : 48000 frames per second
Period size : 1024 frames per period
Network latency : 5 cycles
SampleEncoder : Float
Slave mode : async
****************************************************
Waiting for a slave...
Synching with latency = 0
Synching with latency = 1
Synching with latency = 2
Synching with latency = 3
Synching with latency = 4


Output from slave side:

$ /usr/bin/jackd -dnet
jackdmp 1.9.10
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2014 Grame.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
no message buffer overruns
no message buffer overruns
no message buffer overruns
JACK server starting in realtime mode with priority 20
self-connect-mode is "Don't restrict self connect requests"
NetDriver started in async mode without Master's transport sync.
Waiting for a master...
Initializing connection with chubb.cc-net...
**************** Network parameters ****************
Name : oldchubb
Protocol revision : 8
MTU : 1500
Master name : chubb.cc-net
Slave name : oldchubb
ID : 1
Transport Sync : no
Send channels (audio - midi) : 2 - 2
Return channels (audio - midi) : 2 - 2
Sample rate : 48000 frames per second
Period size : 1024 frames per period
Network latency : 5 cycles
SampleEncoder : Float
Slave mode : async
****************************************************


So it seems that contrary to the documentation netjack2 will create MIDI
channels by default, and at least on my system (where the interface does
support duplex mode) I can start netjack with no arguments and the default
behavior will successfully create a connection.

So I think at this point my guess is that the last output shown by the
original poster indicates some kind of mismatch between the jack ALSA
parameters and the allowed netjack parameters:
>> Can't set net buffer sizes : Invalid argument
>> SetParams error...
>> Can't init new NetMaster...

I thought maybe the buffer size was too large, but the original post was
using -p128 -n2, and at least on my machine I use -p1024 -n3 and that did
not have a problem.

But again, the last message from the original post did not show the
"configuring for..." output line from jackd, so either the jackd output
was truncated in the posting, removing information necessary to help
debug, or the ALSA backend did not actually start correctly.

--
Chris

_______________________________________________
Jack-Devel mailing list
Jack-Devel@lists.jackaudio.org
http://lists.jackaudio.org/listinfo.cgi/jack-devel-jackaudio.org