Stephen Blum
CTO, PubNub

    Earlier this year we received a question about how to use the PubNub Data Stream Network without an SLA officially supported SDK provided by PubNub. This specific case regarded using Google Dart and PubNub to subscribe to a bitcoin feed.

    We don’t recommend doing this, and we recommend using the following method which includes using the standard import 'dart:js' library interop. Details follow, but if you still want to continue with a non-library method, the documentation for the HTTP REST Push API interface is a good starting point.

    But now let’s continue onward with the recommended method below to use PubNub and Google Dart to subscribe to a bitcoin feed!

    You’ll first need to sign up for a PubNub account. Once you sign up, you can get your unique PubNub keys in the PubNub Developer Portal.

    PubNub and Google Dart

    Subscribing to a bitcoin feed using Google Dart is rather simple, though a bit confusing at first. Start by setting up your HTML file with the following script tags; and don’t forget the PubNub <div>!

    PubNub Google Dart HTML File Example

    NOTE: The PubNub <div> includes the bitcoin Subscribe Key paramater.

    PubNub Dart Source File and SDK Usage Subscribe Callback Example

    Next your Dart app source code will simply open the TCP Socket to the live stream. Note the channel ID is BTC-to-USD-stock-trade-value. This channel name is just an example, but many channel streams are provided by botcoin feeds that allow you to receive Trade/Depth/Ticker signals.

    PubNub Dart Source File

    The example channel references were for explanation purposes only and for you as a guide in understanding how to implement a quote symbol streaming solution for realtime price and trade events. Want to build a bitcoin exchange or bitcoin streaming app yourself? Take a look at our Bitcoin Solution Kit.

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