ozett

Testing Multicast Traffic on Linux

Prerequisites

By default Linux ignores Broadcast and Multicast ICMP messages. That's why you need to enable it first:

sysctl -w net.ipv4.icmp_echo_ignore_broadcasts=0

Join and Test Multicast Traffic

To join any mutlicast address (e.g. 224.10.10.10/24) just add it to your active interface (e.g. eth0) and append the keyword autojoin at the end:

ozett

import qrcode

def createQr(vwz,iban,bic,recipient,amount,filename="epc_qr"):
    # The docs can be found here: https://pypi.org/project/qrcode/
    qr = qrcode.QRCode(error_correction=qrcode.constants.ERROR_CORRECT_M)

    qr.add_data("BCD\n")
    qr.add_data("002\n")
    qr.add_data("1\n")
    qr.add_data("SCT\n")

ozett

Restore access to a unifi controller

When you are unable to login to the unifi controller or forgot admin password, you can restore access using SSH and manipulating mongodb directly.

Warning

Do not uninstall unifi controller - most of the data is not stored in mongodb. In case you thought a mongodb backup would be sufficient, you may have fucked up already, just like me. However I managed to write this "tutorial" for anyone to not run into the same trap.

Steps

ozett

git cheat-sheet

The git command-line utility has plenty of inconsistencies http://steveko.wordpress.com/2012/02/24/10-things-i-hate-about-git/

A GUI like http://sourcetreeapp.com is often helpful, but staying on the command line usually quicker. This is a list of the commands I use most frequently, listed by functional category:

Current state

git status list which (unstaged) files have changed

ozett

#!/bin/bash
## thanks to https://gist.github.com/mahowi for the perfect Idea
## put it in /etc/letsencrypt/renewal-hooks/post so it gets run after every renewal.

# parameters
USERNAME="maybe empty"
PASSWORD="fritzbox-password"
CERTPATH="path to cert eg  /etc/letsencrypt/live/domain.tld/"
CERTPASSWORD="cert password if needed"
HOST=http://fritz.box

ozett

Cheap chinese IP camera with H264 encoding based on Hisilicon 8M (Hi3518E) chip

Video stream url for VLC/DVR:

• rtsp://192.168.1.93:554/user=admin&password=&channel=&stream=.sdp?real_stream--rtp-caching=100

Telnet access

• telnet 192.168.1.10 23
• Localhost login: root
• Password: xmhdipc

ozett

#!/bin/bash 
# A simple script to backup an organization's GitHub repositories.

# NOTE: if you have more than 100 repositories, you'll need to step thru the list of repos 
# returned by GitHub one page at a time, as described at https://gist.github.com/darktim/5582423

GHBU_BACKUP_DIR=${GHBU_BACKUP_DIR-"github-backups"}                  # where to place the backup files
GHBU_ORG=${GHBU_ORG-"<CHANGE-ME>"}                                   # the GitHub organization whose repos will be backed up
                                                                     # (if you're backing up a user's repos instead, this should be your GitHub username)
GHBU_UNAME=${GHBU_UNAME-"<CHANGE-ME>"}                               # the username of a GitHub account (to use with the GitHub API)

ozett

INSERT GRAPHIC HERE (include hyperlink in image)

Repository Title Goes Here

Subtitle or Short Description Goes Here

ozett

import tensorflow as tf

def get_frozen_graph(graph_file):
    """Read Frozen Graph file from disk."""
    with tf.gfile.FastGFile(graph_file, "rb") as f:
        graph_def = tf.GraphDef()
        graph_def.ParseFromString(f.read())
    return graph_def

# The TensorRT inference graph file downloaded from Colab or your local machine.

ozett

How to install OpenCV 4.2.0 with CUDA 10.0 in Ubuntu distro 18.04

First of all install update and upgrade your system:

    $ sudo apt update
    $ sudo apt upgrade

Then, install required libraries: