Designing an Offline-Resilient MQTT Buffer with...

The most crucial question for a data collection service over MQTT (Message Queuing Telemetry Transport) Protocol what happens when the downstream service disappears for 20 minutes? That's the question I had when designing a lightweight client to collect data from devices working on MQTT protocol. At first I thought of forwarding every MQTT message directly to an HTTP API. But I had to consider for the unreliable network problem which is common in distributed systems. The moment the downstream AP