[PROTON-395] Messenger - tracker-settled method is needed

• Type: New Feature
• Status: Closed
• Priority: Major
• Resolution: Won't Do
• Affects Version/s: proton-0.4
• Component/s: proton-c
• Labels: messenger
• Assignee: Unassigned
• Reporter: Ted Ross
• Created: 08/Aug/13 14:13
• Updated: 20/Oct/17 22:17
• Resolved: 20/Oct/17 22:17

Description

Messenger has a way to query trackers to get the status of a message delivery. However, there is no way to query the settlement of a delivery. This is needed for the three-ack (exactly-once) exchange pattern.