ekapujiw2002

/**
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Resources: (A bit outdated)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

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™.

• MQTT.js
• Mosquitto™

ekapujiw2002

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

ekapujiw2002

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

ekapujiw2002

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:

ekapujiw2002

#!/bin/bash

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

ekapujiw2002

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()

ekapujiw2002

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)

ekapujiw2002

/* 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.
 * 

ekapujiw2002

from ldap3 import Server, Connection, ALL
from tornado.web import create_signed_value, decode_signed_value

import pywebio
from pywebio.input import *
from pywebio.output import *
from pywebio.session import *

LDAP_AUTH_URL = "ldap://localhost:389"
LDAP_AUTH_SEARCH_BASE = "dc=example,dc=org"