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Having trouble sending any payload to AWS IoT Core using RUT955?

Firmware: RUT9XX_R_00.06.05.3

On my device, I've setup Modbus Data to Server with MQTT, port 8883, Topic, TLS type certificate based and uploaded certificates generated using AWS IoT Core.  Using the default JSON format:

{"ID":"%i", "TS":"%t","ST":"%s","VR":"%a"}

 In the AWS console, Cloudwatch shows solid Success lines for Connect and Subscribe with no AuthErrors.  MQTT test client is listening on the same topic, but no messages come through.

I then attemped to follow https://community.teltonika-networks.com/28337/connect-rut955-to-mqtt-broker-external?show=28337#q28337 with no success.

Any ideas what I'm missing to get my device to send messages to AWS IoT Core?

Thank you.

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Could you please flash the latest available firmware into your device without keeping the settings and then trying to configure everything again?