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If the trusted CA you purchased your certificate from requires an intermediate certificate or if you created a self signed certificate, you will need to specify the CA certificate chain in the configuration.  If you received your certificate from a trusted CA and they require an intermediate certificate, it will be provided by the CA.  If you followed the tutorial above for a self-signed certificate and also created an intermediate CA, it will be the file called 'ca-chain.cert.pem'.  If you simply created a CA without an intermediate cert, it will be the public CA certificate.  Once you've identified the CA certificate chain based on these descriptions, copy it to a file called 'rootCAroot.ca.pem' on your development system.  Note this filename change is important and required.  Upload the file via the configuration as shown here by clicking Save Changes:

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Once the settings are saved, the MQTT client associated with MQTT Engine or MQTT Transmission will connect using TLS.

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