code: function (request) {
        // Extract information from request.  The toString() call converts the
        // payload from a binary Buffer into a string, decoded using UTF-8
        // character encoding.
        console.log('Service received request payload: ' +
          request.payload.toString())
        // Create the response message
        var response = new dxl.Response(request)
        // Populate the response payload
        response.payload = 'pong'
        // Send the response
        client.sendResponse(response)
      }
docs: Handle the receipt of an incoming service request