"Industrial Load Management System Using MQTT Protocol for Real-Time Energy Optimization ", Thesis of Industrial management

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iscvosr | Pre —_ Layer Morr 8-7 | ars So = = ISO/OSI as Layer 4 ISO/OSI { Layer iPr 3 \ Fig. 4.3 Layers of MOTT Once the connection is established, the broker will keep it open as long as the client doesn” tsend a disconnect command or it loses the connection. The Connect and Connack between client and broker is shown in Fig. 4.4. @& CONNECT @ CONNACK ¢€ — MOTT Client MOTT Broker Fig. 4.4 Connect & Connack The original term was broker but it has now been standardized as Serv: er. You will see both terms used. There are many MOTT brokers available that you can use for testing and for real applications. There are free self -hosted brokers. the most popular being mosquittoand commercial ones like HiveMQ. Mosquito is a free open source MQTT broker that runs in Windows and Linux. If you don’t w ant to install and manage your own broker you can use a cloud based broker from Cloud service providers like IBM. Microsofi (Azure) etc. Eclipse has a free public MOTT broker _—— 37 and COAP server that you ean also use for testing. The address is iot.cclipse.org and the port is 1883 or 8883(SSL). 4.2 ARDUINO SOFTWARE IDE Arduino IDE is use to compile and upload the programs to | programs may be written in any programmin binary machine code. =SP32. Arduino g language with a compiler that produces Atmel provides a development environment for their microcontrollers, AVR Studio and the newer Atmel Studio. The Arduino project provides the Arduino in tegrated development environment (IDE). which is a cross- platform application written in Java, It origin ated from the IDE for the Processing programming to artists and other new comers unfamiliar with software development. It includes a code editor with features such as syntax highlighting brace matching, and automatic indentation, and Provides simple one-click mechanis: m for compiling and loading Programs to an Arduino board. A program written with the IDE for Arduino is called a "sketch" - The Arduino IDE supports the C and C++ programming languages using special rules of code organization. The Arduino IDE supplies a software library called “Wiring” from the Wiring project, which provides many common input and output procedures. A typical Arduino C/C++ sketch consist of two functions that are compiled and linked with a program stub main() into an executable cyclic executive program. * setup(): a function that runs once at the start of a program and that can initialize settings. * loop(): a function called repeatedly until the board powers off. 38