[fpc-pascal] Web Service Toolkit - Notify the Client

[Johann Glaser]

Hi!

I'm going to implement a data logger and a GUI frontend in FreePascal.
One (daemon) program gets data from a device connected via USB and
stores it to a file. A second program, the GUI frontend, connects to the
daemon and can retrieve the measured data and other stuff. Additionally
it can send commands to change the measurement settings. 

All this is quite a typical application for RPC, so I plan to use the
Web Service Toolkit with SOAP.

Usually the frontend does a remote procedure call to the backend. There
is one important problem I'm facing now. I want the backend (service
provider) to notify the frontend (service consumer) as soon as a new
measurement value has arrived. So this is the reverse direction of
communication.

Is this possible? Can you please point me to information how to
accomplish this?

Thanks
  Hansi

-- 
Johann Glaser   <Johann.Glaser at gmx.at>
   Vienna University of Technology
       Electrical Engineering
____ http://www.johann-glaser.at/ ____