Re: [Nova-developer] Problems...-Delegated

[Juan C. R. F. <jc...@ca...>]

Hi Gord 

>stupid question time again :) I need to do some testing on the
>autostar driver and don't seem to be able to get spiderd to accept any
>commands. I start up spiderd and telnet to the port and get the 
following:
>.... 
>How do I enter commands?
> 
[] Please use spiderclient, it is a test client, and modify it (to delete 
my probes)!!. 
If you do not want to make any modification, only push the return key when 
asked for a 
file and then send commands. 

Spiderd it is not prepared to support telnet, each message has a header to 
support the 
diferent message types (plain text request, binary data, etc..), and the 
message system 
is asynchronous, that means you must have a thread waiting for the answer 
or to have a 
loop pooling, or any other technique. Spiderclient has examples of all 
message types. 

The other problem, the double call to handler_startup() in the autostar 
driver, is because 
you have defined the driver two times, one for the xy motion and another 
one for the focus. 
There is no problem with this. You can call the same driver to support 
more than one 
device, but I recomend you to atomize the drivers, transferring the common 
code to a 
library. 

If you wish to maintain all together, there is no problem, you only must 
know clearly the commands you want to process.  In your case, if you 
codify together both the xy and focus devices you must deal with both 
command sets within your code, of course!. 

A final note: each execution of the driver runs in its own address space 
because they are 
independent threads, so there are not common vars. If you are using the 
same port for both devices we will have a problem because this is not 
supported, tell me if this is the case to 
try to find out a solution. 


Cheers 
Juan Carlos