Retrieve a new message from the queue

This endpoint retrieves a message from the message queue

parameters:

• topic (required): String used as an address to send/retrieve messages, i.e. myAddonRootVar/function1/myTopic/. The same topic must be provided as during sending of the message.
• token (optional): String that unlocks the message. The exact same string must be provided during the POST deliver call to gain access to the message.