Angus, Sorry, I should have explained better the first time. My application collects data from industrial PLC's via OPC, it is running on quite a number of clients which I cannot constantly check manually. I already have functions to detect failure conditions like no connection to the PLC or lost connection to the database and such. If that happens and the program cannot recover by itself, I get an email so that I can take measures.
The linchpin of all this is, that the program itself is up and running, doesn't hang and that it can still response. Otherwise, days can go by and no data is recorded. So my idea was to have a little watchdog (to be programmed) running on a server which regularly connects to all of the clients to get a response that all is well. The response could by for example the timestamp of the last data received from the PLC or similar. In case there is no response or the timestamp is too old, the watchdog notifies me by email. Florian >> I would like to implement a new feature into one of my applications >> where I can ask for a status >> through a (VPN)network connection, kind of like Nagios does. > > Status of what? > >> Or maybe even build functionality into it so that it can be queried >> by Nagios. > > Query what? > > Nagios is a Linux network monitoring tool, one of dozens, which I believe > variously uses SNMP, HTTP. -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be