U Web Socket IO Starter Guide

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5/27/18, 6*36 PM

uWebSocketIO Starter Guide

uWebSocketIO Starter Guide
All of the projects in Term 2 and some in Term 3 involve using an open source package
called uWebSocketIO. This package facilitates the same connection between the
simulator and code that was used in the Term 1 Behavioral Cloning Project, but now
with C++. The package does this by setting up a web socket server connection from the
C++ program to the simulator, which acts as the host. In the project repository there
are two scripts for installing uWebSocketIO - one for Linux and the other for macOS.
Note: Only uWebSocketIO branch e94b6e1, which the scripts reference, is compatible
with the package installation.

Linux Installation:
From the project repository directory run the script: install-ubuntu.sh

Mac Installation:
From the project repository directory run the script: install-mac.sh
Some users report needing to use cmakepatch.txt which is automatically referenced
and is also located in the project repository directory.

Windows Installation
Although it is possible to install uWebSocketIO to native Windows, the process is quite
involved. Instead, you can use one of several Linux-like environments on Windows to
install and run the package.
Bash on Windows
One of the newest features to Windows 10 users is an Ubuntu Bash environment that
works great and is easy to setup and use. Here is a nice step by step guide for setting
https://classroom.udacity.com/nanodegrees/nd013/parts/40f38239-6…93b5-1a82aa4e044f/concepts/16cf4a78-4fc7-49e1-8621-3450ca938b77#

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up the utility.
We recommend using the newest version of Ubunut Bash 16.04, which is able to run
the install-ubuntu.sh script without complications. The link here can help you check
which version of Ubuntu Bash you are running, and also help you upgrade if you need
to.

Docker
If you don't want to use Bash on Windows, or you don't have Windows 10, then you can
use a virtual machine to run a Docker image that already contains all the project
dependencies.
First install Docker Toolbox for Windows.
Next, launch the Docker Quickstart Terminal. The default Linux virtual environment
should load up. You can test that Docker is setup correctly by running docker version
and docker ps .
You can enter a Docker image that has all the Term 2 project dependencies by running:
docker run -it -p 4567:4567 -v 'pwd':/work udacity/controls_kit:latest
Once inside Docker you can clone over the GitHub project repositories and run the
project from there.

Port forwarding is required when running code on VM and
simulator on host
For security reasons, the VM does not automatically open port forwarding, so you need
to manually enable port 4567. This is needed for the C++ program to successfully
connect to the host simulator.
Port Forwarding Instructions

1. First open up Oracle VM VirtualBox
2. Click on the default session and select settings.
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3. Click on Network, and then Advanced.
4. Click on Port Forwarding
5. Click on the green plus, adds new port forwarding rule.
6. Add a rule that assigns 4567 as both the host port and guest Port, as in the
screenshot.

Setting up port forwarding for 4567 in Virtual Machine

NEXT

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Title                           : Self-Driving Car Engineer - Udacity
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