Re: [Playerstage-users] PTU46 and Read calls in PULL mode

[Nicola B. <ni...@ro...>]

I use only one proxy in PULL mode, and I replace the rule with the following code:

	PlayerClient client("localhost");
	PtzProxy pt(&client);
	client.SetDataMode(PLAYER_DATAMODE_PULL);
	client.SetReplaceRule(true, PLAYER_MSGTYPE_DATA);

Maybe something's wrong?
Cheers
Nicola


gbiggs wrote:
> Have you set a replace rule for the message type you're getting old
> values from?
> 
> Geoff
> 
> Toby Collett wrote:
> Are you subscribed to other proxies as well as the ptz one? Read does
> not guarantee to update all proxies (in fact in push mode it will only
> update one). Set the fresh flag to 0 on the ptz proxy before you read
> and if it is not set to 1 after the read then it has not been updated at
> all.
>
> Toby
>
> 2009/1/8 Nicola Bellotto <nick@ro...
> <mailto:nick@ro...>>
>
> Hi all,
>
> I am having a little problem with the PlayerClient::Read() function,
> getting data from a pan-tilt unit PTU46 (in PULL mode).
> A simple example to explain what happens:
> - start with tilt = 0
> - send a command to reach tilt=0.2
> - wait for the PTU to reach the position
> - read once the position with Read() -> get tilt=0
> - read once more the position with Read() -> get tilt=0.2
>
> Basically Read() returns an old value before the most recent one,
> which shouldn't happen in PULL mode.
> The problem is somehow similar to a previous post about odometry:
>
http://sourceforge.net/mailarchive/message.php?msg_id=1173300103.10158.8.camel%40robot1
>
> Peek() or PUSH mode obviously do not solve the problem.
> Any idea?
>
> Cheers,
>
> Nicola
>
>
> --
> Dr Nicola Bellotto
> Active Vision Lab - Robotics Research Group
> Department of Engineering Science
> University of Oxford
> Oxford OX1 3PJ, United Kingdom
> Tel: +44 (0)1865 283052
> Fax: +44 (0)1865 283145
> http://www.robots.ox.ac.uk/~nick <http://www.robots.ox.ac.uk/%7Enick>
>

-- 
Dr Nicola Bellotto
Active Vision Lab - Robotics Research Group
Department of Engineering Science
University of Oxford
Oxford OX1 3PJ, United Kingdom
Tel: +44 (0)1865 283052
Fax: +44 (0)1865 283145
http://www.robots.ox.ac.uk/~nick