Alternative approach for immediate and mandatory options during publish

[sooryailangovan]

I set the option immediate and mandatory option to false on publish because I need to queue the message when the consumer was busy and later taken up when the consumer is ready to take. The issue I am facing is some of the message were deleted before it was consumed by the consumer. Is there any option or approach to solve this issue. because I found in the document like below

I am using RabbitMq server 3.2.1 and node module version amqp@0.1.7.