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Version: 24.2 (stable)

HELIO MQTT Connection – FAQs & Troubleshooting

Why isn't HELIO displaying the MQTT-published data tree as expected?​

Probable Cause

  • According to the HELIO PLC Protocol over MQTT v1 HELIO expects messages sent as retained.
  • These messages have to be sent quickly after subscribing. Otherwise, problems like incorrect data displays can occur.
  • Running Mosquitto MQTT broker inside a Windows console can slow this process down.

Solution

Run Mosquitto as a service, not a console app, on Windows. This speeds up sending retained messages.