IoT Data Protocols | IoT Protocols

IoT protcols help to establish Communication between IoT Device (Node Device) and Cloud based Server over the Internet. It help to sent commands to IoT Device and received data from an IoT device over the Internet.  Some Popular IoT Data Protocols is – MQTT, CoAP and AMQP.

Read this for understanding IoT Protocols : https://iotbyhvm.ooo/physical-and-logical-design-of-iot/

You may like also : Wireless IoT Network Protocols

IoT Data Protocols

Constrained Application Protocol (CoAP)

The CoAP protocol is specified in RFC 7252. The Constrained Application Protocol (CoAP) is a specialized web transfer protocol for use with constrained nodes and constrained networks in the Internet of Things.
Coap is designed for machine-to-machine (M2M) applications such as smart energy and building automation. The protocol is targetted for Internet of Things (IoT) devices having less memory and less power specifications.

On top of CoAP, the Open Mobile Alliance (OMA) has defined “Lightweight M2M” as a simple, low-cost remote management and service enablement mechanism.

Following are the features of CoAP Protocol:
• It is very efficient RESTful protocol.
• Easy to proxy to/from HTTP.
• Open IETF standard
• Embedded web transfer protocol (coap://)
• It uses asynchronous transaction model.
• UDP is binding with reliability and multicast support.
• GET, POST, PUT and DELETE methods are used.
• URI is supported.
• It uses small and simple 4 byte header.
• Supports binding to UDP, SMS and TCP.
• DTLS based PSK, RPK and certificate security is used.
• uses subset of MIME types and HTTP response codes.
• Uses built in discovery mechanism.

Message Queuing Telemetry Transport Protocol (MQTT)

MQTT is a machine-to-machine (M2M)/”Internet of Things” connectivity protocol. It was designed as an extremely lightweight publish/subscribe messaging transport and useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium. For example, it has been used in sensors communicating to a broker via satellite link, over occasional dial-up connections with healthcare providers, and in a range of home automation and small device scenarios.

MQTT protocol runs on top of the TCP/IP networking stack. When clients connect and publish/subscribe, MQTT has different message types that help with the handshaking of that process. The MQTT header is two bytes and first byte is constant. In the first byte, you specify the type of message being sent as well as the QoS level, retain, and DUP (duplication) flags. The second byte is the remaining length field.