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Introduction

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Courier is a library for creating long running connections using MQTT which is the industry standard for IoT Messaging. Long running connection is a persistent connection established between client & server for bi-directional communication. A long running connection is maintained for as long as possible with the help of keepalive packets for instant updates. This also saves battery and data on mobile devices.

Features​

  • Quality of Service

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

  • Clean API

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

  • Automatic Reconnect

    • Automatically reconnects in case of network or other unexpected failures

  • Observability

    • Provides events for tracking end-to-end delivery

  • Flexible Encoder/Decoder support

    • Converts message payload to and from any custom message type

  • Open Source

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

Contribution Guidelines​

Read our contribution guide to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes to Courier iOS library.

License​

All Courier modules except MQTTClientGJ are MIT Licensed. MQTTClientGJ is Eclipse Licensed.