Server Call - Back Specific Client When Something Happens?
Jun 10, 2010
I have a VB.NET ASP.NET webserver program running. One or more VB.NET clients are making use of it. Nothing special so far. As far as I know, the server is not really aware of the clients. Clients can request data. But is it also possible to let the server call-back a specific client when something happens? So that the client doesn't need to poll?
To be more specific, this server is connected with hardware modules. Clients could be terminals that show the status of a sensor for example. When a sensor gives an "alarm" value, it would be nice if the server could pass that alarm towards the clients. Instead of letting the clients to check each X seconds if that alarm is active. Would be a waste of energy, especially because the chance this alarm goes off is almost zero...
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