Well, it's not really "pretty" yet (as a dashboard) but
MQTTool for IOS works, "not bad"... and it's totally free.
I changed the PHP script around a bit to publish all the "Load Averages" (in one message) and all the "Wuhan Coronavirus Stats" (in one message) and subscribed to both of them. In the "Load Average" app, there is the one, five and fifteen minute server load averages (very handy if managing a server, obviously) and in the "Wuhan" app, there are the C (confirmed cases), the S (suspected cases), the D (deaths) and R (recovered cases). You can easily start to image the myriad way to use MQTT for you own private "things" network from this short tutorial, I think.
BTW, I am still searching for a good "dashboard" app for MQTT (for either IOS or macOS), but no joy yet.
When you think about it. MQTT is "the only way to go" if you are developing these kinds of private "IoT" app, every devices can be both a publisher and a subscribe, and if you run your own private MQTT server, you do not have to worry about a third parties mining your data.