This endpoint adds a message to 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 to retrieve the message.
• payload (required): this is the message you want to send, e.g. "test message".
• token (optional): Any string that will act as a key. If given, the exact same string must be provided during the GET retrieve call to gain access to the message.
• lifetime (optional): The time the message is available in seconds. Default is 8 hours, 7 days is the maximum (adjustable for dedicated installations).