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Lets assume there is just temperature data which needs to be exchanged. The communication between devices happens over a particular topic. But saving data ont this computer is optional.
#HOW TO RUN MOSQUITTO ON WINDOWS PC#
It is a physical entity in your network, like a computer PC or raspberry pi. The broker is nothing different than server in our previous case. As the storage is completely optional at the server, its now called as broker. Look at the generalized mqtt block diagramĪs you can see, the entities are now called as publisher and subscriber. So depending on whether its sending data or receiving data, the client computers are called as Now the clients or individual computer in mqtt, can have one of the 2 jobs. Then topic names can beīasically topic is a means of communication with which the clients will communicate each other. For example, in IoT you have to turn on cooler or heater or a fan or a motor or anything using a relay. Topic can also be the device control action. So talking about IoT, a topic can be a sensor value or a parameter which is being sent by one or more devices and which needs to be received by one or more devices. This is one of the reason why mqtt is used most in internet of things. A topic is basically a virtual communication ID and is better understood in terms of internet of things.
#HOW TO RUN MOSQUITTO ON WINDOWS HOW TO#
Now how to know which client wants that data? In order to know which client wants which data and which client sends which data, mqtt uses something called topics.
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Instead the server immediately sends that data back to the clients who need it by fetching from its own cache. The data saving into any database on server is completely optional. Now if the same communication is to be done using mqtt, lets see how it works.įirst, in MQTT, there is no need to save the data at the server end. Server responds with the available data.Server receives it and stores it somehow.Client 1 reads temperature and sends it to Server.Lets take an example of IoT project and client 1 is sending temperature and client 2 wants to have that temperature. And when client 2 sends a request for that data then server will serve it. Now in above structure, what usually happens is when client 1 sends some data, the server hasto save it. The typical configuration will look like this Lets say when 2 computers wants to talk to each other, unless we’re using a direct TCP communicaiton, we often need server. In a very conventional sense, whenever we talk about 2 computers talking to each other, the general way of communication is Client -> Server Communication. In order to do any of these things, first thing is to understand how mqtt works? and what are the advantages over the conventional client-server communication How Client-server communication Works? If you want to know how to setup raspberry pi for the first time, you can read it here You can also use mqtt to send data to raspeberry pi from PC. or you can use mqtt to send data to PC from raspberry pi. You can use mqtt for any small requirement of sending data from one computer to another computer. But do you know that mqtt can be a good choice of sending data in local networks too? Instead of juggling with TCP or HTTP request and running webserver, mqtt can be a super simple, yet reliable solution for local network data exchange between raspberry pi to raspberry pi or Raspberry pi to computer. We know that MQTT can be and is widely used for Internet of Things Applications.