Those are Indigo messages (Indigo interpretation of the Insteon response) which mean something to Indigo but means nothing to me. I am familiar with the actual Insteon responses if those are traced and can be posted.
Matt indicates Indigo Actions can be used which do not require any links to the output relays. What is driving the desire to create links and use Group commands rather than Direct commands?
FYI: Broadcast messages relate to how the EZIOxx devices send Input state changes to the application. Broadcast messages have no relation to how the output relays are controlled.