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You will now be asked to specify a password for the keypair.  At this point MQTT Distributor requires that the Key Pair passwords match the overall Keystore password.  So, make sure you note this password because we'll need to use it as the overall keystore password as well.

If your certificate also requires an intermediate certificate, it must be appended to the keypair.  Do so by right-clicking the keypair and navigating to Append Certificate as shown below.  In the case of self-signed certs, this means clients only need to have the root CA certificate trusted on their system.  In the case of certificates signed by trusted CAs, the clients don't need to have any additional TLS configuration loaded on their system.

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Now browse to your intermediate certificate as shown below and click Append:

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You should see the following.  Simply click OK.

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At this point, you can save your keystore and specify a keystore password.  Do so by clicking the save icon in the upper left menu:

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At this point, all MQTT clients can now connect over TLS enabled connections.  Note the new port of 8883.  If using a certificate signed by a publicly trusted CA and the OS with the MQTT client supports that specific CA, the clients don't have to make any modifications to their list of trusted root certificates.  If using a self-signed certificate there are a couple options:

• The root CA cert can be added to the Operation System's list of trusted root certificates
  • This means the application doesn't need to handle special cases (i.e. modifications to the Java Truststore)
• The client side application can be modified to load the root CA certificate to validate the server certificate against
  • This doesn't require OS changes

  Note if your certificate also requires an intermediate certificate, this must also be added to the MQTT client so the full chain of trust can be established.

Using the Certificate to Secure Communication with MQTT Engine or MQTT Transmission:

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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.  Them it needs to be uploaded 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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