Gateway Event Timer sendMessage not work

[pturmel]

You can't use system.perspective.sendMessage() outside of Perspective scripts. Gateway events are outside of Perspective. You must use system.util.sendMessage(...., scope='S') to deliver to a perspective session message handler, which can then relay with system.perspective.sendMessage() to the actual perspective scope you wish to target (if not session).

See this discussion:

Set/Configure tag binding with script in Perspective

So, to get this to work I had to make a handler in the project's "Session Events" to receive from system.util.sendMessage(..., scope='S'). It then just calls system.perspective.sendMessage(..., scope='session') with the same payload. The component can receive this latter broadcast. This is a nuance that should be put in the documentation. (That messages broadcast to Perspective via system.util.sendMessage(..., scope='S') can only be received in "Session Events".)