Heartbeat

Hello,

according to the documentation https://help.ctrader.com/open-api/connection/ => Best Practices, it should be sent a ProtoHeartbeatEvent every 10 seconds.

I got the samples and my application working, but I'm not sure how to keep the connection alive. The C# samples don't send any ProtoHeartbeatEvent (in my mind), set only “HeardbeatInternal” to 10 seconds by the OpenClient constructor: 

this.Client = new OpenClient(this.Server_ApiHost, this.Server_ApiPort, TimeSpan.FromSeconds(10));

the WinForm-Sampe subscribes to these events, but OnMessage is not called by ProtoHeartbeatEvent

this.Client.ObserveOn(SynchronizationContext.Current).OfType<ProtoMessage>().Subscribe(OnMessage, OnError);

although it is expected by it (OpenApiMessagesPresentation):

switch ((ProtoPayloadType)msg.PayloadType)
{
	//....
	case ProtoPayloadType.HeartbeatEvent:
 		var _hb = ProtoHeartbeatEvent.Parser.ParseFrom(msg.Payload);
 		_str += "Heartbeat";
 		break;

I could figure ProtoHeartbeatEvent out by adding a sbscription particularily to ProtoHeartbeatEvent, OnProtoHeartbeatEvent will be called every 30 seconds:

this.Client.ObserveOn(SynchronizationContext.Current).OfType<ProtoHeartbeatEvent>().Subscribe(OnProtoHeartbeatEvent);

private void OnProtoHeartbeatEvent(ProtoHeartbeatEvent protoHeartbeatEvent)
{
	string sDebug = "";
}

If I send a ProtoHeartbeatEvent from client-side every 5 seconds, OnProtoHeartbeatEvent will keep calling each 30 seconds:

public void Heartbeat()
{
  	ProtoMessage protoHeartbeatEvent = new ProtoMessage
  	{
   			Payload = new ProtoHeartbeatEvent
   			{
   			}.ToByteString(),
   			PayloadType = (int)ProtoPayloadType.HeartbeatEvent
  	};
  	this.SendProtoMessage(protoHeartbeatEvent);
}

private async void SendProtoMessage(ProtoMessage protoMessage)
{
	if (string.IsNullOrWhiteSpace(protoMessage.ClientMsgId)) 
 	protoMessage.ClientMsgId = this.GetGUID();

	await this.Client.SendMessage(protoMessage);
}

wich looks strange, does not meet my client side ProtoHeartbeatEvent sendings each 5 seconds as well not 10 seconds specifiied by the OpenClient constructor. My Heartbeat() method seems to be ignored without any response.

I doubt that the connection will be lost later and would like to know how to make sure that connection will keep alive. Could someone explain how to get OnProtoHeartbeatEvent called each 10 seconds and especially controlled called, so amendable by the client.

Thank you so much for your help!

Bernhard