Communication protocols

1. Communication Protocol

2.  MQTT stands for Message Queuing Telemetry Transport. It is a publish/subscribe,
extremely simple and lightweight messaging protocol, designed for constrained devices
and low-bandwidth, high-latency or unreliable networks.
 The design principles are to minimise network bandwidth and device resource
requirements whilst also attempting to ensure reliability and some degree of assurance
of delivery.
 These principles also turn out to make the protocol ideal of the emerging “machine-to-
machine” (M2M) or “Internet of Things” world of connected devices, and for mobile
applications where bandwidth and battery power are at a premium.
MQTT Protocol

3. HTTP vs MQTT
MQTT HTTP
Full Form Message Queue Telemetry
Transport
Hyper Text Transfer Protocol
Design
Methodology
The protocol is data centric. The protocol is document centric.
Architecture It has publish/subscribe
architecture. Here devices can
publish any topics and can also
subscribe for any topics for any
updates.
It has request/response
architecture.
Complexity Simple More Complex
Data security YES NO, hence HTTPS is used to
provide data security.
Message size small, it is binary with 2Byte
header.
Large, it is in ASCII format.
Port number 1883 80 or 8080

4. Working

5. Practical On Adafruit IO using MQTT