API endpoint for receiving messages

[rac2030]

API endpoint for receiving messages, this will get called with the device ID as parameter and the response will be either empty list or a list of messages to be displayed. It will look for new message in the personal message bus and it will fetch all new messages from the broadcast message bus. Messages have a type, ACTION=methodName(parameter) the method with the given parameter allows for different actions triggered from the message it receives.