Is Omnet Simulator Suitable to Simulate Iot Protocols Like Mqtt Coap And Dds

Time needed: 5 minutes

Follow from Step 1 to Step 5 in order to create IoT Protocols projects. Quick guide to create simulate IoT Protocols. Reach us , if you want an customize IoT Protocols projects works for scholars.

1. Topology

   IoT devices work by collecting the data from users. The data’s are collect through input devices such as touch screens or sensors used for motion detection, temperature, humidity, pressure, etc. Next perform the storage and processing in the data servers and in finally the resulting information is provided to the end user devices for analysis and control. For example of a Smart Home setup.
   For example , bu use the omnet++ we can create and control the smart home applications, the smart home consists of devices like thermostat, door sensor, smart bulbs, smart refrigerator, smart TV, surveillance systems, etc. in the applications make a communication between the Internet connected devices , the end user’s smartphone, mobile application or data center and vice-versa.

2. Protocols

   Based on the type of application and its functionality there are many protocols used in an IoT ecosystem at different layers of an OSI Model. In the IoT devices communication we use the different protocols like 6LoWPAN, Bluetooth BLE, ZigBee, etc. next perform the deciding factor process during the protocol process based on the distance range for the communication of the IoT devices i.e. in inches or meters or miles. Amd also we can use the mqtt coap and dds protocols for the corresponding process.

3. MQTT (Message Queue Telemetry Transport)

   MQTT is a machine-to-machine (M2M) protocol. By use this protocol we perform the process of communicate device data to the servers based on the publish-subscribe-based messaging protocol. The mainly we use the MQTT to control and monitoring the IoT devices remotely. It will used when a huge network of small devices needs to be monitored or managed via Internet. For example by usin the omnet++ we use the parking sensors in VANET, underwater lines in underwater sensor networks, energy grid, etc.
   during the simulation we can integrating the Paho MQTT C++ library with the OMNeT++ simulation creation and execution process. During the process we can copy the source directories and use the custom make files in our projects for building the C and the C++ libraries inside OMNeT++.
   The sample code for the integration of Paho MQTT with omnet++ is ,
   include “MQTTConnector.h”
   Define_Module(MQTTConnector);
   const string SERVER_ADDRESS { “tcp://localhost:1883” };
   const string CLIENT_ID { “sync_client” };
   const string TOPIC { “hello” };
   const int QOS = 1;
   class callback : public virtual mqtt::callback
   {
   mqtt::client& cli_;
   void connected(const std::string& cause) override {
   std::cout << “\nConnected: ” << cause << std::endl; cli_.subscribe(TOPIC, QOS); std::cout << std::endl; } void connection_lost(const std::string& cause) override { std::cout << “\nConnection lost”; if (!cause.empty()) std::cout << “: ” << cause << std::endl; std::cout << std::endl; } void message_arrived(mqtt::const_message_ptr msg) override { std::cout << msg->get_topic() << “: ” << msg->get_payload_str() << std::endl;
   }
   void delivery_complete(mqtt::delivery_token_ptr token) override {}
   public:
   callback(mqtt::client& cli) : cli_(cli) {}
   };
   void MQTTConnector::initialize() {
   mqtt::connect_options connOpts;
   connOpts.set_keep_alive_interval(20);
   connOpts.set_clean_session(false);
   connOpts.set_automatic_reconnect(true);
   client = new mqtt::client(SERVER_ADDRESS, CLIENT_ID);
   callback cb(*client);
   this->client->set_callback(cb);
   try {
   cout << “Connecting to the MQTT server…” << flush; this->client->connect(connOpts);
   cout << “OK” << endl;
   } catch (const mqtt::exception& exc) {
   cerr << exc.what() << endl;
   }
   }

4. Constrained Application Protocol (CoAP)

   The Constrained Application Protocol (CoAP) is one of a specialized web transfer protocol for use with constrained nodes and constrained networks in the Internet of Things . This protocol is specifically simulation for the IoT and M2M applications. This application layer protocol can be seen as an enhancement of HTTP for low power devices. The process is based on the successful REST model, by using the GET, PUT, POST and DELETE methods. By using the omnet++ simulation , we perform the process though it shares similarities with HTTP, CoAP is specifically designed to run over UDP only. The integration of omnet++ with CoAP defines two types of messages, namely confirmable messages and nonconfirmable messages to define its own reliability mechanism.

5. Data Distribution Service (DDS)

   The Data Distribution Service (DDS) is one of the middleware, it is used for perform the data transmission in the real time systems operating in a distributed environment. By using the omnet++ we will perform the realtime implementations , like defense, aerospace industrial internet of things, healthcare and automotive by using the DDS middleware. By use this protocol we can perform the fast, efficient and predictable data communication. During the implementation the DDS middleware uses a UDP-based protocol, its latency is a few hundred microseconds at most.