When adding a listener on the user channel, the `payload.channelId` should be `null`.

[robmoffat]

Minor Issue

Area of Issue

• App Directory
• API
• Context Data
• Intents
• Desktop Agent Bridging
• Use Cases
• Other

Issue Description:

As reported by @ksgeorgieva :

While testing the @finos/fdc3 package with our implementation of FDC3 for Web, I encountered an issue with addContextListenerRequest under the following scenario:

Two apps — A and B:
App A joins user channel 1
App A broadcasts context
App B joins user channel 1
App B adds a context listener (using fdc3.addContextListener)

In this case, the context listener is added to the current channel. According to the addContextListenerRequest schema, when adding a listener on the current channel, the payload.channelId should be null.

Could you please double-check that:

• channelId is sent when the method is invoked via the channel interface, and
• channelId is NOT sent when the method is invoked on the Desktop Agent?