Thanks for your list, I will give a shot to Postman and Atom.
I’m using MQTT Spy as an MQTT client. I tried Mqtt.fx, it has some nice features but it is 218MB vs 9MB. Today drive space is really low cost, but in my old-style head one third of a CD for an MQTT client means that there’s something wrong…
Although I will say that, having a UI for MQTT troubleshooting, on the desktop is quite handy. Plus I really like one of the more recent Mqtt.fx features… It’s got a topic-collector! So basically, if a topic gets published to (without subscribing), it adds it to a list. Great for troubleshooting pesky clients, and to verify all the topics you’re expecting, are actually reporting data.