What is MQTT? MQ Telemetry Transport Protocol is a lightweight broker-based publish/subscribe messaging protocol designed to be open, simple, lightweight and easy to implement. ! Development Lead by IBM New v3.1.1 spec is standardized at OASIS IUUQEPDTPBTJTPQFOPSHNRUUNRUUWNRUUWIUNM IUUQXXXJCNDPNEFWFMPQFSXPSLTMJCSBSZXTNRUU
Features of the protocol • Light weight publish/subscribe protocol over TCP/IP • A small transport overhead • the fixed-length header is just 2 bytes • QoS - Three qualities of service for message delivery. Qos 0:”At most once”, QoS 1: ”At least once”, QoS 2: ”Exactly once”. • A mechanism to notify interested parties to an abnormal disconnection of a client using the Last Will and Testament feature IUUQUEPDJOGPCMPHNRUUIUNM
Fit for M2M (IoT) These characteristics make it ideal for use in constrained environments, for example, but not limited to: ! • Where the network is expensive, has low bandwidth or is unreliable • When run on an embedded device with limited processor or memory resources
What is MQTT.IO? MQTT.IO is a porting “MQTT over WebSocket” to the Socket.IO. Currently just experimental project. ! Socket.IO 1.0 supports Binary streaming, so we can do it now! Thanks Guillermo!
Advantage of MQTT.IO vs WebSocket We can use MQTT anywhere! ! Many MQTT broker support WebSocket, but some of load-balancer/reverse-proxy like Amazon ELB cannot allow WebSocket connection (> <)
Advantage of MQTT.IO vs Socket.IO • Easy to use many other language • JavaScript, Java, Go, C/C++, Python • Flexible pub/sub using wildcards • /groups/group1/1 => Send to user 1 • /groups/group1/# => Send to group1 • /groups/# => Broadcast to all group • Can Use MQTT features (QoS, Will, Retain) • Easy to Scale Backend servers (maybe)
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