any one explain about how to publish and subscribe data step by step by using node MCU.
another question that i have two esp`s ,esp A and esp B .A publish the data and B subscribe the data and send to local server by using mqtt is it work? A publish(not connected to pc its just wifi) ------>B Subscribe(connected to pc) and publish same data----->local server in pc Subscribe the data is it work.
design A publish data----->b Subscribe data and again publish data ------>local server Subscribe data by using mqtt. for better understanding. 2.if i need to publish any data, we need to convert it to char datatype?