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WebSocket connection failed. Error in browser console, since Grafana version 8.0.4. · Issue #36929 · grafana/grafana · GitHub
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Solved] Attempting MQTT connection... Failed. rc=-1 or rc=-2 or rc=-4 | General MQTT Errors Explained. - Electronics Innovation
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Future Internet | Free Full-Text | Open-Source MQTT-Based End-to-End IoT System for Smart City Scenarios
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