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Should I use MQTT?
MQTT is used for data exchange between constrained devices and server applications. It keeps bandwidth requirements to an absolute minimum, handles unreliable networks, requires little implementation effort for developers, and is, therefore, ideal for machine-to-machine (M2M) communication.
Why MQTT is best suited for IoT systems?
Depending on the CPU capabilities, MQTT can connect many thousands or even millions of devices. Besides the scalability, it is simple to use. It has low system requirements and high compatibility with Internet-connected applications. That is why this network technology is so popular in the IoT.
Are there any IoT applications which use MQTT protocol?
So, no wonder there are many popular IoT applications which use MQTT protocol. For example, IBM Watson IoT Platform uses MQTT as the main communication protocol. Amazon Web Services used MQTT as a basis for AWS IoT services. AWS IoT Core has an MQTT-based message broker, and it supports two levels of MQTT QoS.
Which is the best programming language for MQTT?
MQTT is an open protocol with standard documentation. It has a set of ready-made libraries for C/C++, Java, JavaScript, Python, and other programming languages. The open-source MQTT libraries and public brokers minimize the development costs and speed up the development process.
How big does a MQTT message have to be?
MQTT transmits messages in packets. A packet consists of a: Fixed header — This is a mandatory part of the message comprising a control header and a packet size. The minimum size is 2 bytes and the maximum size is 5 bytes.
What is the role of a publisher in MQTT?
A publisher creates messages and publishes them to a certain topic. A subscriber receives the messages relevant to the topic it is subscribed to. Publishers and subscribers may switch roles, and sometimes MQTT clients take on the role of both. The number of publishers and subscribers can be unlimited.