Eka Puji Widiyanto ekapujiw2002

Setup nut and netdata on Ubuntu

In this document, I will explain how to setup nut (Network UPS Tools) on Ubuntu 18.04 and 20.04.

It is basically the next chapter of my previous gist, Upgrade nut on Ubuntu 18.04.

I'll only document USB connected UPS and not the other supported connection modes.

Install required dependencies

MQTT in your browser

MQTT is probably best known as a lightweight messaging protocol implemented for small sensors, but there is actually a JavaScript implementation called MQTT.js. It's a JavaScript implementation, so of course it works in a browser. I think it's a great option for front-end engineers who are working with MQTT/IoT-related projects (for example, creating a dashboard to visualize MQTT data). In this article, I'd like to write about what I did when I tried to connect MQTT.js to the test server (broker) of Mosquitto™.

之前在这里研究过的用iptables配置跨网段的端口转发

Assume we have the following network environments:

Device:
- eth0 (192.168.6.59): for external access
- enx000ec6a490c5 (192.168.1.2): for ip camera
IP Camera：192.168.1.10
PC：192.168.6.2

Copying the whole linux root filesystem locally or remotely using rsync

Explanation of chosen options:

Verbose output with speed and progress information
Try to preserve all possible information: file attrs, hardlinks, ACLs and extended attrs,
Exclude contents of pseudo-filesystems and mountpoints
In this example source host is remote and destination local.

rsync --info=progress2  -vaHAX --exclude={"/dev/*","/proc/*","/sys/*","/tmp/*","/run/*","/mnt/*","/media/*","/lost+found"} source.host:/ /local/destination

	server {
	server_name house.example.net;
	listen 1.2.3.4:80 default_server;
	listen [2001:1234:ffff::1]:80 default_server;

	add_header Cache-Control "public,max-age=31536000";
	return 301 https://$server_name$request_uri;
	}

	map $ssl_client_s_dn $ssl_username {


	/**
	ESPNOW - Basic communication - Broadcast
	Date: 28th September 2017
	Original Author: Arvind Ravulavaru <https://github.com/arvindr21>
	modified by Daniel de kock
	Purpose: ESPNow Communication using Broadcast

	Resources: (A bit outdated)
	a. https://espressif.com/sites/default/files/documentation/esp-now_user_guide_en.pdf

	import asyncio
	from collections.abc import Coroutine
	from typing import Any


	async def gather_limit(
	*tasks: Coroutine[None, None, Any],
	return_exceptions: bool = False,
	max_con: int = 100,
	) -> Any:

	import pandas as pd
	import re
	import string
	from tqdm import tqdm
	from Sastrawi.Stemmer.StemmerFactory import StemmerFactory

	class DataCleaning:
	# Initialization
	factory = StemmerFactory()
	stemmer = factory.create_stemmer()

	import numpy as np
	import cv2
	import imutils

	template = cv2.imread('template.jpg') # template image
	image_o = cv2.imread('image.jpg') # image

	template = cv2.cvtColor(template, cv2.COLOR_BGR2GRAY)
	image = cv2.cvtColor(image_o, cv2.COLOR_BGR2GRAY)

	#!/bin/bash

	sudo mount -o remount,size=10G,noatime /tmp
	echo "Done. Please use 'df -h' to make sure folder size is increased."