QUIC

2 articles

Software Engineering 19 Sep 2026 8 min read

MQTT and QUIC Solve Different Parts of a Chat Transport

MQTT and QUIC Solve Different Parts of a Chat Transport MQTT and QUIC are often placed in the same comparison table when discussing real-time chat. That comparison is convenient, but it collapses two different protocol layers into one choice. MQTT is an application-layer messaging protocol. It defines concepts such as clients, brokers, topics, subscriptions, retained messages, session state, and delivery quality of service. QUIC is a secure transport protocol over UDP. It provides connections, streams, flow control, loss recovery, encryption, and connection migration mechanisms.

Software Engineering MQTT

Tech 15 Sep 2026 7 min read

QUIC Connection IDs Keep Sessions Across Address Changes

A network connection is often associated with addresses and ports. That works well while both endpoints keep the same network attachment, but mobile devices regularly move between Wi-Fi and cellular service, and NAT devices can replace an external UDP port while an application is still active. QUIC provides another identifier for the transport connection: the connection ID. A non-zero-length connection ID lets an endpoint associate incoming QUIC packets with existing connection state even when the packet arrives from a different IP address or UDP port.

QUIC Networking