You want to connect with username and password to a secured Kafka cluster that has...

security.protocol=SASL_SSLsasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required username='myUser' password='myPassword';

security.protocol=SSLsasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required username='myUser' password='myPassword';

security.protocol=SASL_PLAINTEXTsasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required username='myUser' password='myPassword';

security.protocol=PLAINTEXTsasl.jaas.config=org.apache.kafka.common.security.ssl.TlsLoginModule required username='myUser' password='myPassword';