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Networking Acronyms & Terminology ​

  • MO: Mobile originated. A message sent by a mobile or remote device, e.g. a phone, is MO.

  • MT: Mobile terminated. A message sent to a mobile or remote device, e.g. a backend server or provider, is MT.

  • TTL: Time-to-live. A message that has been in a queue for longer than the configured TTL is said to be dead, or expired.

  • MQTT: Message Queuing Telemetry Transport. A lightweight pub-sub network protocol. Ref: https://mqtt.org/

  • AMQP: Advanced Message Queuing Protocol. A powerful and flexible messaging queue protocol. See Setting up an AMQP Broker (RabbitMQ)

  • Durability is a property of (AMQP) broker entities; queues and exchanges. If the server restarts, a durable entity will be recreated.

  • Persistence is a property of messages. Persistence is usually handled by writes to disk in a persistency log. If the server restarts, any durable queues/exchanges will be re-populated with persistent messages.

Hint

Message persistency, like everything else in life, comes at a price. Disk I/O is slow, and writing every message to disk can reduce the number of messages a broker can process per second.