Error when retrieving live alarms

MIP
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1

Hi,

I’m trying to get live alarms using:

  • IAlarmClient.StartAlarmLineSession
  • IAlarmClient.GetSessionAlarmLines
  • IAlarmClient.StopAlarmLineSession

I get this error:

Data provider 'Alarms' failed to fetch data. No signature message parts were specified for messages with the 'http://videoos.net/2/CentralServerAlarmCommand/IAlarmCommand/GetSessionAlarmLinesResponse' action.

The corresponding code for events works fine.

I have reproduced on two different systems (2023 R2 and 2024 R1).

Guid liveSession = alarmClient.StartAlarmLineSession(CreateFilter());
var alarmUpdateData = alarmClient.GetSessionAlarmLines(MaxLinesLive, liveSession);

Any ideas?

2

I think my best course of action will be to try to reproduce your observation.

Can you please give me more of the code that I can try to reproduce the same way you use it?

3

Thanks! See code example below.

4

It is very easy. In a Smart Client plugin try this code:

try
{
		int maxLinesLive = 10000;
		IAlarmClient alarmClient = new AlarmClientManager().GetAlarmClient(
				EnvironmentManager.Instance.MasterSite.ServerId);
		Guid liveSession = alarmClient.StartAlarmLineSession(CreateAlarmFilter());
		var alarmUpdateData = alarmClient.GetSessionAlarmLines(maxLinesLive, liveSession);
}
catch (System.ServiceModel.Security.MessageSecurityException)
{
		// problem
}
 
private AlarmFilter CreateAlarmFilter()
{
		return new AlarmFilter()
		{
			Conditions = new Condition[]
			{
				new Condition()
				{
					Operator = Operator.GreaterThan,
					Target = Target.Timestamp,
					Value = DateTime.UtcNow,
				},
				new Condition()
				{
					Operator = Operator.LessThan,
					Target = Target.Timestamp,
					Value = DateTime.UtcNow.AddDays(1)
				}
			},
			Orders = new OrderBy[]
			{
				new OrderBy()
				{
					Target = Target.Timestamp,
					Order = Order.Descending
				}
			}
		};
}
5

I am unable to reproduce because I run into something different..

Exception thrown: ‘System.ServiceModel.ProtocolException’ in VideoOS.Platform.dll

An exception of type ‘System.ServiceModel.ProtocolException’ occurred in VideoOS.Platform.dll but was not handled in user code

A reply message was received for operation ‘GetSessionAlarmLines’ with action ‘http://videoos.net/2/CentralServerAlarmCommand/IAlarmCommand/GetSessionAlarmLinesResponse’. However, your client code requires action ‘http://videoos.net/2/CentralServerAlarmCommand/IAlarmCommand/GetAlarmLinesResponse’.

I will try to ask developers here at Milestone what that is. If you know what I might be doing wrong, please update me.

6

I think the difference came down to whether you use encrypted communication (HTTPS) or not.

Milestone Development are working on a fix.

7

Ok, thanks! Great to hear a fix is coming.

8

Following up on this, the fix is implemented in 2024R2 soon to be released.

9

Thanks, Bo, for the follow-up. I now tested and it works perfect with 2024 R2 BETA Smart Client.