No. The driver (cmucam2.cc) publishes a PLAYER_MSGTYPE_RESP_ACK reply to the hdr->subtype that was passed in to the ProcessMessage function.
From: email@example.com on behalf of Toby Collett
Sent: Sat 7/26/2008 1:54 AM
Subject: Re: [Playerstage-users] CMUCam ptz driver
Does the response publish in the driver just after the match message you corrected also have a hard coded 0?
2008/7/20 Maddox, Derek <DMADDOX@ball.com>
I have a CMUCam2+, mounted in the turret available from Acroname, riding
on the back of a Create platform. The first stage of the experimental
setup I'm using calls for the Create to navigate through a floorplan
searching for an object of a specified color with the CMUCam blobfinder,
using the camera's onboard servo controllers to pan the turret back and
forth as the Create trundles along.
I'm using Player 2.1.1 running on a gumstix verdex computer (Linux
2.6.21 buildroot) cross compiled from Ubuntu 8.04 on a x86 development
platform. The pertinent portion of the config file is:
provides ["blobfinder:0" "ptz:0"]
color0 [11 61 142 192 0 44]
For the client software driving the scenario, I gutted the ptz example
in the /examples/libplayerc++ folder. I'll not post the entire program,
but here's the part that is (at least I think is) important to the
question to follow:
double newpan = -50.0;
double tiltval = -10.0;
Things go swimmingly right up to the SetCam function call. Then Player
(on the gumstix) prints the following warning:
"warning : Unhandled message for driver device=16777343:6665:ptz:0
type=command subtype=1 len=20"
After a long and educational afternoon of liberally sprinkling "print"
statements through the code, I discovered that the header for the
command from the client to the server has subtype 1 (which is
PLAYER_PTZ_REQ_GENERIC) as it should be, according to the interface
definition file. The CMUCam driver code handling incoming messages is
looking for a subtype 0 (with the "0" hardcoded, not included by
reference to a defined value). There is no message subtype 0 for the
Brilliant guy that I am, I modified the driver code to look for
PLAYER_PTZ_REQ_GENERIC command subtype. Voila, the camera pans! But,
then I got warnings of "unclaimed ACK" messages and a segmentation fault
when the message cleanup function jumped into oblivion. Taking the
chance of simply ignoring that message works, for a while, but then I
eventually get a "got the wrong kind of reply (not good)." message and
the whole ptz function locks up.
Bottom line, it seems as though the client and the server are looking
for different types of messages. Has anyone else had better luck with
this? Is there something simple that I've overlooked?
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