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The NodeMCU is an ESP8266 WiFi based microcontroller board that helped overcome some of the difficulties associated with several versions of boards based on the ESP8266 WiFi module /chips from Espressif. As the popularity of Arduino boards increased, the demand for boards which comes embedded with some of the add-ons used with the Arduino increased. One of the most popular add-ons were the WiFi modules which are used to connect Arduino boards to the internet. Several boards were released by different manufacturers which used the Arduino form factor and had onboard WiFi module, but none of these boards became as popular as the NodeMCU. Today, we will be exploring how to use the ESP8266 NodeMCU board in projects and especially how to easily program the board using the Arduino IDE. The NodeMCU is an ESP8266 WiFi based microcontroller board that helped overcome some of the difficulties associated with several versions of boards based on the ESP8266 WiFi module/chips from Espressif. ES

T he integration of  MQTT (Message Queuing Telemetry Transport)  protocol with 4G modules has become an important aspect in IOT. In this article we will discuss how the MQTT protocol works in 4G modules, we will understand what MQTT protocol is, its use cases. And much more. What is MQTT? MQTT is a standards-based messaging protocol, or set of rules, used for machine-to-machine communication. Smart sensors, wearables, and other Internet of Things (IoT) devices typically have to transmit and receive data over a resource-constrained network with limited bandwidth. These IoT devices use MQTT for data transmission, as it is easy to implement and can communicate IoT data efficiently. MQTT supports messaging between devices to the cloud and the cloud to the device. The MQTT Protocol Consists of Four Main Components Client:  A device or application that connects to the MQTT broker to either publish or subscribe to topics. Broker:  A server that receives and distributes messages between publis