Driving motivation with the resilient messaging protocol is to have a system that works in disasters.
One scenario is the Internet has gone down but low bandwidth link is available. Ham radio HF band can go long distances but has small bandwidth (300 bps). The plan is that would have sign out front of house, public Wifi network, and a gateway that sends messages over the radio. It would be slow and the queue might be long, but texts can get out. It also works with higher bandwidth links, like satellite phone or with part of Starlink connection.
The other scenario is communication over short distances between members of disaster response teams. It should work over Bluetooth, Wifi, Lora, and ham radio. It would also be nice if messages could be relayed to command center over ham radio links. I have idea for disaster management system that manages people assigned to incidents by messaging them over normal and reliable systems.