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This flow (and associated circuits/hardware) is designed to allow Node-RED to pass messages via radio waves in the same way as it passes messages via MQTT, using commonly-available, inexpensive handheld radios and the Raspberry Pi. The flow has been tested using Baofeng, Wouxun, and Quansheng handheld ham radios. In short, the goal is to allow packet-like transmissions between Node-RED systems over miles, while keeping the hardware costs down (or free for those hams who have surplus Baofengs hanging around). This could be used for a backup to MQTT when the Wifi is unreliable, or simply as a long-distance and network-agnostic message channel.

Prerequisites: Software

First, we need PulseAudio to make and receive sounds with our USB soundcard:

sudo apt-get install pulseaudio -y

This Gist is about how I use PyAudio, NumPy, and Matplotlib to plot freqency spectrum of system sound or microphone.

You can read this blog post for more detail or watch this video:

https://i.ytimg.com/vi/hiGB_AP6iTo/maxresdefault.jpg

Location	Name	Frequency	Duplex	Offset	Tone	rToneFreq	cToneFreq	DtcsCode	DtcsPolarity	Mode	TStep	Skip	Comment	URCALL	RPT1CALL	RPT2CALL	DVCODE
1		462.125000		0.000000	TSQL	88.5	69.3	023	NN	FM	5.00	S
2		462.225000		0.000000		88.5	88.5	023	NN	FM	5.00	S
3		462.325000		0.000000		88.5	88.5	023	NN	FM	5.00	S
4		462.425000		0.000000	TSQL	88.5	103.5	023	NN	FM	5.00	S
5		462.525000		0.000000	TSQL	88.5	114.8	023	NN	FM	5.00	S
6		462.625000		0.000000	TSQL	88.5	127.3	023	NN	FM	5.00	S
7		462.725000		0.000000	TSQL	88.5	136.5	023	NN	FM	5.00	S
8		462.825000		0.000000	TSQL	88.5	162.2	023	NN	FM	5.00	S
9		462.925000		0.000000	DTCS	88.5	88.5	023	NN	FM	5.00	S

	-- MTPhreak IMEI changer and randomizer for MediaTek NVRAM
	-- This version is adapted specifically for the Sigma sKai and other MT6572 based phones

	-- Usage: lua mtphreak-6572.lua NVRAMfile [imei1 [imei2]]
	-- If no IMEIs are passed, they are randomized (with respect to Luhn checksum)

	function parseImei(imeistr) -- imei string to 12-byte table
	local imeiTbl = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
	for i = 1, 15 do
	local digit = tonumber(imeistr:sub(i,i))

	{
	"key_events": {
	"key_unknown": "adb shell input keyevent 0",
	"key_soft_left": "adb shell input keyevent 1",
	"key_soft_right": "adb shell input keyevent 2",
	"key_home": "adb shell input keyevent 3",
	"key_back": "adb shell input keyevent 4",
	"key_call": "adb shell input keyevent 5",
	"key_endcall": "adb shell input keyevent 6",
	"key_0": "adb shell input keyevent 7",

	Create a Bing API key
	https://www.bingmapsportal.com/application/create/1354301

	Download the plugins
	https://github.com/shramov/leaflet-plugins

	```html
	<!DOCTYPE html>
	<html>
	<head>

	int analogPin = 0;

	void setup() {
	Serial.begin(9600);
	pinMode(LED_BUILTIN, OUTPUT);
	digitalWrite(LED_BUILTIN, LOW);
	pinMode(4, OUTPUT);
	digitalWrite(4, HIGH);
	}

	from scipy.io.wavfile import read, write
	from scipy.signal import find_peaks_cwt, firwin, lfilter, medfilt, resample, hamming
	from scipy.optimize import fmin
	import numpy as np
	from matplotlib import pyplot as plt

	import argparse


	class Tone:

	var ipp = require('ipp'); //get it from there - https://npmjs.org/package/ipp - $npm install ipp
	var request = require('request'); //get it from there - https://npmjs.org/package/request - $npm install request
	var fs = require('fs');

	function getPrinterUrls(callback) {
	var CUPSurl = 'http://localhost:631/printers';//todo - change of you have CUPS running on other host
	request(CUPSurl, function (error, response, body) {
	if (!error && response.statusCode == 200) {
	var printersMatches = body.match(/<TR><TD><A HREF="\/printers\/([a-zA-Z0-9-^"]+)">/gm);//i know, this is terrible, sorry(
	var printersUrls = [];

	#!/bin/sh -e
	hostname=$1
	device=$2
	file=$HOME/.dynv6.addr6
	[ -e $file ] && old=`cat $file`

	if [ -z "$hostname" -o -z "$token" ]; then
	echo "Usage: token=<your-authentication-token> [netmask=64] $0 your-name.dynv6.net [device]"
	exit 1
	fi