Gateway message gone missing

Ignition
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1

My test setup is a Gateway timer script that sends a message using system.util.sendMessage that is supposed to be received by an event handler in a view object.

Here is the GW timer script that runs every 4 seconds

GWScript
GWScript711×159 4.86 KB

Here is the event handler on the object

Handler

The project and message names match, and the GW script is writing to the wrapper log, but I am not receiving events on the object.

The only thing I can think of is that I am not receiving events because I am testing the object in the designer. Is that a possibility, and also how else do you debug messages?

2

Messages sent to Perspective with system.util.sendMessage() are only received in Session Message Handlers.

Perspective views and components can only receive messages that come from system.perspective.sendMessage(). Consider using a session message handler to rebroadcast for components to receive.

1 Like
3

To be clear, you are talking about putting an event handler here that receives the GW message? (and that event handler then broadcasts a session message using system.perspective.sendMessage())

Sessionevents

4

Yes.

5

Hmm .. so I added this script, and I get nothing in the wrapper log

Session Message
Session Message1026×473 39.6 KB

Obviously I am missing something.

6

Hi, if you're trying to print something in the logger, it's best to use system.util.getLogger

1 Like
7

Technically, yes I should use the logger functionality, but simple prints end up in the wrapper log as INFO messages. (and I did try the official logger for that message received above, and still got didly squat.)

8

You've set up your message as follows:

system.util.sendMessage(Project,Message,None,None,'CGS')

According to the manual page which you sited, the syntax is:

system.util.sendMessage(project, messageHandler, [payload], [scope], [clientSessionId], [user],[hasRole], [hostName],[remoteServers])

So you've set your scope to None, when in reality if you want it to be "heard" by sessions the scope needs to be at least "s".

Try this:

system.util.sendMessage(project = Project, messageHandler = Message, scope = "s")

See if you get a print out then.

1 Like
9

Yep, one too many "None" in the call. And I totally missed it.

10

Do as @lrose said and use named parameters whenever possible (sadly, some functions don't accept them) instead of relying on Nones to put your parameter at the right place.