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README.md: Remove server certificate allowance step from usage guide

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With previous commit, gencert.sh automatically add the certificate to
FireFox or Chrome using certutil command. Blupy-scratch-link users no
need to allow the certificate explicitly.

Also add NSS to the required package list to install, which includes the
certutil command.

Signed-off-by: Shin'ichiro Kawasaki <kawasaki@juno.dti.ne.jp>
This commit is contained in:
Shin'ichiro Kawasaki
2020-04-18 20:26:43 +09:00
parent 3a784edbd5
commit 4da6b4714a
1 changed files with 35 additions and 16 deletions
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51
README.md
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@@ -23,8 +23,8 @@ If your system has python older than version 3.6, install newer version. If your
Linux system has explicit command names python3 and pip3 for python version 3,
use them in the instructions below.
Confirmed devices and distros
-----------------------------
Confirmed Environments
----------------------
The instructions below was confirmed with following devices and distros.
Trial with other distros and feed-backs will be appreciated.
@@ -37,6 +37,10 @@ The bluepy-scratch-link was confirmed with following Linux distros:
* elementary OS 5.0 Juno by @kawasaki
* Raspbian by @chirsglencross
The bluepy-scratch-link was confirmed with following browsers:
* FireFox by @kawasaki
* Chromium by @kawasaki
Installation
------------
1. Prepare Bluetooth/BLE controller.
@@ -45,13 +49,13 @@ Installation
Bluetooth 4.0 controller supports BLE. If your PC does not have it, need
to plug USB Bluetooth 4.0 adapter.
2. Install Bluez package.
2. Install required packages.
```sh
Ubuntu
$ sudo apt install bluez libbluetooth-dev
$ sudo apt install bluez libbluetooth-dev libnss3-tools
Arch
$ sudo pacman -S bluez
$ sudo pacman -S bluez nss
```
3. Install python modules.
@@ -73,11 +77,22 @@ Installation
5. Prepare web server certificate.
Scratch-link requires local Secure WebSocket server with certificate.
Generate and prepare a PEM certificate file.
Run a script to generate the certificate file and corresponding key file.
Be sure to run it as the user to run the web browser for Scratch so that
the script can add the generated certificate to FireFox or Chrome.
```sh
$ cd ~/bluepy-scratch-link
$ ./gencert.sh
```
Generating a RSA private key
..................................................+++++
.....................................................................................+++++
writing new private key to 'scratch-device-manager.key'
-----
Generated certificate: scratch-device-manager.cer
Generated key: scratch-device-manager.key
Added certificate to FireFox NSS DB: /home/shin/.mozilla/firefox/XXXX.default
Added certificate to Chrome
```
6. If using a micro:bit, install Scratch-link hex on your device.
@@ -151,16 +166,20 @@ Usage
$ sudo python3 ./scratch_link.py
```
4. Start Firefox or Chrome and allow local server certificate
* This action is required only the first time to access.
* Open Firefox or Chrome and open [https://device-manager.scratch.mit.edu:20110/](https://device-manager.scratch.mit.edu:20110/). You will see a security risk warning.
4. Connect scratch to micro:bit or Lego Mindstorms:
* Open FireFox or Chrome and access [Scratch 3.0](https://scratch.mit.edu/)
* Select the "Add Extension" button
* Select micro:bit or Lego Mindstorms EV3 extension and follow the prompts to connect
* Build your project with the extension blocks
In Case You Fail to Connect
---------------------------
If Scratch says "Make sure you have Scratch Link installed" but you are sure
that scratch-link python script is running...
1. Check that Firefox or Chrome allow local server certificate
* Open Firefox or Chrome and access [https://device-manager.scratch.mit.edu:20110/](https://device-manager.scratch.mit.edu:20110/). You will see a security risk warning.
* In **Firefox**: Click "Advanced" and click "Accept Risk and Continue".
* In **Chrome**: type the special bypass keyword `thisisunsafe`.
* Immediately, you will see "Failed to open a WebSocket connection". This is expected.
5. Connect scratch to micro:bit or Lego Mindstorms:
* Open [Scratch 3.0](https://scratch.mit.edu/)
* Select the "Add Extension" button
* Select micro:bit or Lego Mindstorms EV3 extension and follow the prompts to connect
* Build your project with the extension blocks