function externalEvents(node) {
    const RED = uib.RED
    // The event name to listen out for
    const eventName = `UIBUILDER/send/${node.url}`
    node.sender = (msg) => {
        // this.send(msg)
        sockets.sendToFe(msg, node, uib.ioChannels.server)
    }
    // Create new listener for the given topic, they are removed on close
    RED.events.on(eventName, node.sender)
}
Create external event listeners
Called for every uibuilder node instance
@param {uibNode} node Reference to node instance