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- Checklist: Build Objective-C (iOS) WebSocket Clients
| \# | Step | Topic or Reference |
|---|---|---|
| 1 | Learn how to use the Objective-C Client API. | [Use the Objective-C WebSocket Client API](p_dev_objc_client.html) |
| 2 | Learn how to authenticate your client by implementing a challenge handler to respond to authentication challenges from ${gateway.name.long}. | [Secure Your Objective-C Client](p_dev_objc_secure.html) |
| 3 | Learn how to gather data on ${gateway.name.long} Objective-C client. | [Display Logs for the Objective-C Client](p_dev_objc_log.html) |
| 4 | Troubleshoot the most common issues that occur when using Objective-C clients. | [Troubleshoot Your Objective-C Client](p_dev_objc_tshoot.html) |
In this how-to, you will learn how to use the ${gateway.name.long} Objective-C client library to enable your iOS client to communicate with any back-end service over WebSocket via the ${gateway.name.long} or any RFC-6455 WebSocket endpoint.
This document contains information for an Objective-C developer who wants to add Objective-C to an iOS client to enable communication with a back-end server through ${gateway.name.long} or any RFC-6455 WebSocket endpoint.
For more information on the Objective-C API, see Objective-C Client API.
${gateway.name.long} provides support for the HTML5 Communication protocol libraries in Objective-C. Using the Objective-C Client API, you can enable the HTML5 WebSocket protocols in new or existing Objective-C applications. For example, you can create an Objective-C client to get streaming financial or news data from a back-end server using WebSocket. The following figure shows a high-level overview of the architecture:
 **Figure: Enable Communication Between Your iOS Client and a Back-end Server over WebSocket**This is a sidebar. hello.