jkeefe

Preparing a Pi

My Mac is too old to use the Raspberry Pi Imager.

So intstead I ...

• go to the downloads page and download the "Raspberry Pi OS" version (as opposed to the "Full" or "Lite" versions — just my preference).
• use balenaEtcher to image a Mini SD card. The card should be an "A2" version, and I like to use 64GB.
• use a USB keyboard and HDMI monitor to set up:
• Wifi network and password (set on first bootup)

jkeefe

BLUETOOTH SNIFFER

Working to sniff Bluetooth Low Energy with the adafruit sniffer

For more information, see this blog post

Going the python route, as described here

before installing pySerial, did ...

jkeefe

// based on: https://stackoverflow.com/a/67136959

const niceRounder = (number) => {

    let near = 1
    if (number > 100) near = 10
    if (number > 1000) near = 100
    if (number > 10000) near = 1000

    if (number % near === 0) return number;

jkeefe

# example: get rid of large `.tif` and `.nc` files in gis/tmp
# from https://www.geeksforgeeks.org/how-to-remove-a-large-file-from-commit-history-in-git/

git filter-branch --force --index-filter \
'git rm --cached --ignore-unmatch gis/tmp/*.tif' \
--prune-empty --tag-name-filter cat -- --all

git filter-branch --force --index-filter \
'git rm --cached --ignore-unmatch gis/tmp/*.nc' \
--prune-empty --tag-name-filter cat -- --all

jkeefe

// npm install mapshaper --save

import mapshaper from 'mapshaper'

// Example of runCommands: converting a directory of Shapefiles to GeoJSON
mapshaper.runCommands('-i shapefiles/*.shp -o geojson/ format=geojson');

// ----

// Example of applyCommands: processing a json array

jkeefe

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:ListAllMyBuckets"
            ],
            "Resource": "arn:aws:s3:::*"
        },

jkeefe

const fs = require('fs')
const gm = require('gm').subClass({ imageMagick: '7+' });

WIDTH = 1138
HEIGHT = 50
X = 0
Y = 0

gm('./images/us_at_bottom.png')
    .region(WIDTH, HEIGHT, X, Y)

jkeefe

[
    {
        "AllowedHeaders": [
            "*"
        ],
        "AllowedMethods": [
            "GET",
            "HEAD"
        ],
        "AllowedOrigins": [

jkeefe

// from https://github.com/iamkun/dayjs/issues/1619#issuecomment-1185714859

const round: PluginFunc = (option, dayjsClass) => {
  dayjsClass.prototype.round = function (amount, unit) {
    const mod = this.get(unit as UnitType) % amount;

    if(mod < amount / 2) {
      return this.subtract(mod, unit).startOf(unit);
    }

jkeefe

// installation:
//  npm install dayjs dayjs-plugin-utc --save
// note: if not already a module, in package.json add "type":"module",

import dayjs from 'dayjs';
import updateLocale from 'dayjs/plugin/updateLocale.js';
import utc from 'dayjs/plugin/utc.js';     
import timezone from 'dayjs/plugin/timezone.js';

// set up the as-of date