[Elphel-support] change camera parameters through Telnet

[Biel Bestué de Luna]

what I'm doing is a python Elphel API<https://github.com/BielBdeLuna/ElpAPI>,
and I planed (if it where possible, that I see it isn't) to make a list of
requests and send them to the camera, the idea was to don't keep sending
small wget requests every time the user changed a setting in the local GUI
in their computer.
If the user changes "EXPOS" in our GUI application in their laptop I
intended to send a single line request via Telnet and the camera reacted to
it.
That would eventually be useful if the user would be controlling several
parameters at the same time via some peripheral, that's where my idea of
asynchonoulsy went,
The user would be controlling his sets of controls and the camera would be
following him, reacting to it's demands.
With wget this is more difficult because the change isn't instantaneously,
as it needs to download a file with changes in order to implement the
changes in the camera.


2012/12/13 support-list <support-list at support.elphel.com>

> **
> Biel,
>
> This is exactly why we implemented PHP - to make things easier to control.
> We used fastCGI mode to speed things up by making sure several instances of
> PHP are loaded to memory and waiting for a job (so "wget
> http://localhost/script.php" is much faster for the short scripts than
> "php script.php" - no wait for PHP itself to load and start).
>
> For your custom application - you do not need to load anything over the
> network - your custom php script in the camera can do whatever changes it
> needs to do. So it is not your host application sending many small http
> requests to some standard camera API - it is your in-camera script doing
> whatever is needed and communicating with the host as needed. And it will
> be much faster than controlling camera over telnet.
>
> And there is no similar functionality in shell scripts.
>
> Andrey
>
>
> ---- On Thu, 13 Dec 2012 11:12:06 -0800 *Biel Bestué de Luna<
> 7318.tk at gmail.com>* wrote ----
>
> indeed, this is way too advanced for me. I don't understand a thing :)
>
> The thing with wget, is that it forces you to download files when you just
> want to change a value in the camera, what would be cool would be to have a
> process to change the camera values without the need to download anything,
> I'm currently streaming with the camera, and I find odd to have to download
> files form the camera to change a value in it. and since I tried the pixel
> summing I've seen that that process is way more quickly than wget.
>
>
>
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>
>
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