Hi Inam, Please find below link for reference : https://community.hortonworks.com/articles/178747/mqtt-with-apache-nifi.html (I have tested it and worked fine for me) Also as you are using psk-identity please check for "use_identity_as_username" value in your mosquitto.conf file. I am not very much sure about psk-identity but you can use mosquitto_passwd to set password for particular user and redirect the password to a file which file can be used for authentication to publish MQTT messages. ... View more