Key Features

Courier provides a mechanism for creating long running connection on mobile applications and backend services using MQTT protocol

Quality of Service

Supports three QoS delivery levels: 0 (atmost once), 1 (atleast once) and 2 (exactly once)

Provides clean API for connect / disconnect, subscribe / unsubscribe and publish / receive functionalities

Automatically reconnects in case of network or other unexpected failures

Provides events for tracking end-to-end delivery

Converts message payload to and from any custom message type

Open-source client libraries for GoLang, Android, iOS, & Flutter

Go package for creating long running connections using MQTT protocol

Android library for creating long running connections using MQTT protocol

iOS library for creating long running connections using MQTT protocol

Dart Flutter library for creating long running connections using MQTT protocol

Gojek's fork of VerneMQ as broker for handling long running connections using MQTT protocol