Eka Puji Widiyanto ekapujiw2002

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™.

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

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

Raspberry Pi Setup Guide

This guide will use either a macOS or an ArchLinux base system, to prepare a microSD card with Arch Linux for Raspberry Pi.

If someone managed to do the initial setup using Windows, please let me know, so I can add to this guide.

This guide will be verbose at times for some simple tasks. This is intended to help people just starting out, so it's not confusing. If something confuses you, let me know and I'll try my best to answer it.

	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 cv2
	import socketio #python-socketio by @miguelgrinberg
	import base64

	sio = socketio.Client()
	sio.connect('http://x.x.x.x:xxxx)

	cam = cv2.VideoCapture(0)

	while (True):

	from flask import Flask, request, jsonify
	from flask_sqlalchemy import SQLAlchemy
	from flask_marshmallow import Marshmallow
	from flask_restful import Resource, Api


	app = Flask(__name__)
	api = Api(app)
	app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///users.db'
	app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False

	/* Arduino data manipulation and concatenation with structures and unions
	*
	* This simple (ish) sketch shows you how to organize your data into a struct
	* and then access the whole thing as a byte array.
	*
	* Useful if you want to concatenate several variables into a single byte array
	* to send over bluetooth, i2c, lora or any other protocol that works with arrays.
	* In other words you have a fixed byte array, and we squeeze in variables of different
	* data types and lengths into it, while still using it as a byte array afterwards.
	*

	import cv2
	import numpy as np

	img = np.zeros((100, 300, 3), dtype=np.uint8)

	ft = cv2.freetype.createFreeType2()
	ft.loadFontData(fontFileName='Ubuntu-R.ttf',
	id=0)
	ft.putText(img=img,
	text='Quick Fox',