Easily type multiple messages on WhatsApp and annoy your friends and play
(No root required)
uses accessibility service
Step 1 : on the accessibility service for WhatsApp Loop
Step 2: type the message
Step 3: choose number of message to be iterated
Step 4: click send button and select single contact on WhatsApp .

Trobleshooting
If the service does not work just try to restart it by turning off.