Phillip Sitbon sitbon

Raspberry Pi Zero OTG Mode

Simple guide for setting up OTG modes on the Raspberry Pi Zero - By Andrew Mulholland (gbaman).

The Raspberry Pi Zero (and model A and A+) support USB On The Go, given the processor is connected directly to the USB port, unlike on the B, B+ or Pi 2 B, which goes via a USB hub.
Because of this, if setup to, the Pi can act as a USB slave instead, providing virtual serial (a terminal), virtual ethernet, virtual mass storage device (pendrive) or even other virtual devices like HID, MIDI, or act as a virtual webcam!
It is important to note that, although the model A and A+ can support being a USB slave, they are missing the ID pin (is tied to ground internally) so are unable to dynamically switch between USB master/slave mode. As such, they default to USB master mode. There is no easy way to change this right now.
It is also important to note, that a USB to UART serial adapter is not needed for any of these guides, as may be documented elsewhere across the int

Building Tensorflow from source on Ubuntu 16.04LTS for maximum performance:

TensorFlow is now distributed under an Apache v2 open source license on GitHub.

On Ubuntu 16.04LTS+:

Step 1. Install NVIDIA CUDA:

To use TensorFlow with NVIDIA GPUs, the first step is to install the CUDA Toolkit as shown:

Sample config for 2 million web socket connection

    sysctl -w fs.file-max=12000500
    sysctl -w fs.nr_open=20000500
    # Set the maximum number of open file descriptors
    ulimit -n 20000000

    # Set the memory size for TCP with minimum, default and maximum thresholds 
 sysctl -w net.ipv4.tcp_mem='10000000 10000000 10000000'

Getting access token

Enable developer console in browser and navigate to:

https://www.facebook.com/v2.6/dialog/oauth?redirect_uri=fb464891386855067%3A%2F%2Fauthorize%2F&scope=user_birthday%2Cuser_photos%2Cuser_education_history%2Cemail%2Cuser_relationship_details%2Cuser_friends%2Cuser_work_history%2Cuser_likes&response_type=token%2Csigned_request&client_id=464891386855067&ret=login&fallback_redirect_uri=221e1158-f2e9-1452-1a05-8983f99f7d6e&ext=1556057433&hash=Aea6jWwMP_tDMQ9y

Look for the response of POST request in the network tab of developer console: https://www.facebook.com/v2.6/dialog/oauth/confirm?dpr=1 it contains the access token parameter. Just search for 'access_token' in the response. For the lazy people (like myself) i made a small helper that parses the token from response https://taseppa.github.io/tokenparser.github.io/

Getting facebook id

Prologue

I wrote this answer on stackexchange, here: https://stackoverflow.com/posts/12597919/

It was wrongly deleted for containing "proprietary information" years later. I think that's bullshit so I am posting it here. Come at me.

The Question

Amazon is a SOA system with 100s of services (or so says Amazon Chief Technology Officer Werner Vogels). How do they handle build and release?

	import os
	import sys
	import traceback
	from functools import wraps
	from multiprocessing import Process, Queue


	def processify(func):
	'''Decorator to run a function as a process.

	# Simple linux tun/tap device example tunnel over udp
	# create tap device with ip tuntap add device0 tap
	# set ip address on it and run tap-linux on that device and set desitation ip
	# run same on another node, changing dst ip to first node

	import fcntl
	import struct
	import os
	import socket
	import threading

	to check if the server works - https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice

	stun:
	stun.l.google.com:19302,
	stun1.l.google.com:19302,
	stun2.l.google.com:19302,
	stun3.l.google.com:19302,
	stun4.l.google.com:19302,
	stun.ekiga.net,
	stun.ideasip.com,


	#include "audiorenderer.h"
	#include "videorenderer.h"
	#include "audiocapturemodule.h"
	#include "yuvframecapture.h"
	#include "conductor.h"

	#include "webrtc/api/test/fakeconstraints.h"
	#include "webrtc/video_encoder.h"
	#include "webrtc/modules/video_coding/codecs/vp8/simulcast_encoder_adapter.h"

	<!DOCTYPE html>
	<html>

	<head>
	<meta charset="UTF-8">
	<title>A simple clock</title>

	</head>

	<body translate="no" >