MQTT Essentials – Version 3.1.1
MQTT Client Authentication
Bevywise MQTTRoute is a perfect message broker that supports the simple authentication to establish a connection, which matters the most in the MQTT essentials. The clients should send the authentication in the connect packet as per the MQTT protocol standard to secured the broker client connection. This provides the best practices to secure & ensure that only authorized clients can connect to the MQTT Broker enabling secure machine to machine communication.
All QoS Support
The MQTT Broker supports all the Quality of Service levels in MQTT as per the MQTT Standard Specifications.
QoS 0 – Atmost Once
QoS 1 – Atleat Once
QoS 2 – Exactly Once
The QoS levels guarantee message delivery and are related to the MQTT connection between the client and the broker. When an MQTT client publishes a message to a broker, the client decides the QoS level of its message based on its network reliability by making communication over unreliable networks much simpler. Check here for detailed QoS blog series.
Last WILL and Retain
Bevywise MQTT Broker support WILL and Retained messages. MQTT LAST WILL registered with the broker when the MQTT client connects. WILL messages are sent to interested clients who subscribe to a particular WILL topic and also used to send a message to the client if they lose connection due to network outage. Retain messages can be received by configuring the MQTT Retain bit. Retained Messages are sent to new subscribers on a specific topic, and the broker processes the request and publishes the messages to the configured clients.
Persistence Session and Message Queuing
MQTT Broker supports Clean Session 0 and 1 for persistent and clean connections. The broker will honor the clean session parameter set by the MQTT client on a connection. When the client connects to the broker, it can request a persistent session from the broker. The broker stores the client’s information and the topics it has subscribed to in a message queue. When the client reconnects after disconnecting, the broker sends all undelivered mqtt messages in a message queue to the client.
When a subscribing client subscribes to a topic, they can use wildcards to subscribe to multiple topics at the same time. Topic hints to an UTF-8 string that the broker uses to filter messages for each client connected. Each topic must contain at least 1 character and that the topic string permits empty spaces.When subscribing to multiple topics, you can use two wildcards: single-level and multi-level representing as [+] or [#] wildcard character. MQTT Broker supports both single-level [+] and multiple topic levels [#] wildcard for subscribing more MQTT topics at a time.
MQTT Server handles both transient error and protocol violation error based on MQTT specification by closing down only the network, which causes that error and does not allow to interact with other successful clients.
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With the complete MQTT protocol support & MQTT Broker configuration you will develop any sort of IoT applications / solutions that controls & interacts with sensors / devices. Dive deep into MQTT & its working with MQTT developer guide.