slate_technologies:
We've told you multiple times: they don't work. MQTT doesn't work that way. What you are doing is you are sending a message (let's use a slip of paper as an analogy), and sending it to a server online. That server reads that message, and keeps it till you access it.
Once you send another message, that previous message goes away. That piece of paper gets thrown into the recycling. It's gone.
I believe that @codegang project doesn't work properly but with MQTT if someone publishes a message to a broker and sets it to be retained (remembered), then anyone subscribing to that message will be given a copy of it.
Until the message is overwritten by a new message.
DRAFT _ WORK IN PROGRESS