I can't connect with my ESP8266 running nodemcu. With the same program I can connect to other MQTT brokers. The strange thing is, I can connect to ThingStudio via a Windows application.
What can be wrong that it's impossible to connect to ThingStudio via an ESP8266 running NodeMcu....?
Have you correctly set the username and password on the ESP?
Can you tell me the following
ESP dev environment (Arduino, Lua, etc)All the connection details on the ESP.If possible post the code you are using.