前陣子開發xdmq時，被問到跟MQTT和AMQP有什麼差異

MQTT

MQ Telemetry Transport (MQTT) is a lightweight broker-based publish/subscribe messaging protocol

本質上MQTT是一項protocol，而且有幾項特色

• broker-based (broker and brokerless)
• pub/sub model

設計來用於

• Where the network is expensive, has low bandwidth or is unreliable
• When run on an embedded device with limited processor or memory resources

https://public.dhe.ibm.com/software/dw/webservices/ws-mqtt/mqtt-v3r1.html

大多數是應用在IOT

AMQP

Advanced Message Queuing Protocol

金融業發展出來用於交易所訊息交換的協定

適用於wire-level

這些都屬於一種協定，而另外有基於這些協定的broker實作，來符合這些協定

而xdmq實作了一個message broker，內部以raft作為核心，對於訊息的protocol則未有嚴謹規範