It's simple to send/receive messages from the Dev Console using Socket.IO by following these instructions. You must simply follow the format of the message and issue a Publish Message using your Channel Name and Namespace used in your Socket.IO app.

This example shows you how to send events to your Socket.IO clients using other PubNub libraries. We are using the simple syntax of Python here for the example:

from PubNub import PubNub

## Create a PubNub Object
pubnub = PubNub( 'demo', 'demo', None, False )

## Publish To Socket.IO
pubnub.publish({
    'channel' : 'my_pn_channel',
    'message' : {
        "name" : "message",                  ## Event Name
        "ns"   : "example-ns-my_pn_channel", ## Namespace
        "data" : { "my" : "data" }           ## Your Message
    }
})