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Subscribe callback

How to pass the channel information to subscribe callback?

There are three optional parameters to the subscribe message callback: message, envelope and channel. Here is an example of how to use these three parameters.

    channel: 'channel1'
    message: function(msg, env, ch) {
        console.log("channel: " + ch + 
            "; envelope: " + env + 
            "; message: " + JSON.stringify(msg));

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