How to start Whatsapp/send a message with Whatsapp

How to send a Whatsapp message to a specific mobile number?
There is this Android solution but this is unfortunately not possible with App Inventor, you only can open Whatsapp like this



Download aia file for App Inventor


or you can prepare the message in App Inventor and pick a contact from the Contact Picker in Whatsapp to send it like this

Download aia file for App Inventor