OnPing event on the HTTPServer?

[zxplzzc]

I want to exchange simple data through the automatic OnPing event on the client,but it seemed that I can't find the peer on the http server,is it right?
Thanks!

[D.Tkalcec (RTC)]

There is no special "OnPing" event on the Server, because default PING calls do not send any data to the Server and you have full control over the "Data" object when using the "OnPing" event on the Client. This way, you can call any function on the Server you want.

For example, if you want to use the "OnPing" event on the Client to call a remote function on the Server called "PingMe", simply place the following code inside the "OnPing" event on the Client (TRtcClientModule component) ...

with Data.newFunction('PingMe') do
  begin
  // prepare all parameters for the "PingMe" function
  // asInteger['testPar1']:=12345;
  // asString['par2']:='This is a test';
  end;

When you do this, the "PingMe" remote function will be called on the Server every time a PING request is sent. In other words, the OnExecute event of the TRtcFunction with FunctionName="PingMe" will be executed, the same way it would be if you were calling the function using Call or Execute methods.

Best Regards,
Danijel Tkalcec

[D.Tkalcec (RTC)]

By the way ... the purpose of the "OnPing" event is to keep the Server-side Sessions alive. Because every remote function call will do the same (keep the Session for that Client alive), waiting timer for the next OnPing event will be reset every time a new remote function call is made, so a PING call will ONLY be made if there were no remote function calls made for longer than your specified AutoSessionsPing interval (seconds).

In other words, the automatic PING feature of the TRtcClientModule is NOT just a periodical remote function call. If other remote function calls are being made using the same TRtcClientModule component, the OnPing event will NOT be used in order to avoid generating unnecessary traffic. If you need your code on the Server to be executed periodically, even if other remote function calls are being made, then you should use a Timer component instead and send your remote calls directly (not through the OnPing event).

Best Regards,
Danijel Tkalcec

[zxplzzc]

Your answer is always so quick,clear,patient and pleasant.
Thanks very much!