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mqtt (QOS (At most once, At least once, Exactly once), broker/server…
mqtt
QOS
At most once
At least once
Exactly once
broker/server
self-hosted: mosqitto
commercial: HiveMQ
cloud-based broker
free:Eclipse
Message Queuing Telemetry Transport
ISO standard
publish-subscribe-based messaging protocol.
works on top of the TCP/IP protocol
when small code footprint required
when network bandwidth is limited
requires a message broker
Information is organized in a hierarchy of topics
MQTT relies on the TCP
MQTT-SN, is used over other transports such as UDP or Bluetooth
client: available on most languages like python