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/* ATTiny LED Twinkler
 * 
 * This is come code I wrote a while back to "twinkle"
 * four GPIO outputs that would drive LEDs. It was designed
 * to be run on an eight-pin ATTiny13 chip. It works
 * quite well, even considering how inefficient it is.
 *
 * - Robert Quattlebaum, 2012
 */

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/// Demonstration of a way to do polymorphic property lookup of standardized
/// collections of properties via simple traits and getter methods. This
/// approach could be extended to do things like fetch a list of the supported
/// keys, or expose aritrary traits via a property interface.


/// This is the trait that will be our general-purpose property interface. It
/// is intended to be used as a trait object.
///
/// This trait is implemented automatically by the `impl_super_trait!` macro,

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/// Demonstration of compile-time key-value type safety.
///
/// This program demonstrates how you use Rust generics to encode type
/// information into the keys for a key-value store. This allows for
/// type-safe access to data in the store, preventing things like writing
/// strings to keys that should only contain integers. Attempting to
/// do so results in a compile-time error.
///
/// The example code is at the top of this file, the implementation details
/// are below the example.

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use futures::prelude::*;
use pin_utils::unsafe_pinned;
use std::ops::Deref;
use std::pin::Pin;
use std::sync::Arc;

/// A container for a single object with lifetime that is bound to that of an `Arc`.
/// This is useful for passing around boxed futures that have a lifetime that is limited
/// to that of the object that created it.
///

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Tesla Key Card Protocol

Researched by Robert Quattlebaum [email protected].

Last updated 2020-02-03.

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Curve25519/Curve448 Terminology

Curve25519: A well-known Montgomery curve designed for ECC at a 128-bit security level.

X25519: The name of the scalar-point multiplication function for points on Curve25519 when performing ECDH. It is also commonly used as a shorthand for ECDH-using-Curve25519.

EdDSA:

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#!/bin/sh

GP=${GP-java -jar gp.jar}

set -v
set -e

# This is for the ACR122U to put it into
# a nice state where it won't time out on us.
$GP -d -v -a ff0041ff00 -a ff00520000 || true

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Hacking the Rectangular Starlink Dishy Cable

These are are some notes I put together on butchering the rectangular dishy cable.

FOLLOW THESE GUIDELINES AT YOUR OWN RISK. I TAKE NO RESPONSIBILITY FOR ANY DAMAGE OR INJURY YOU SUSTAIN FROM FOLLOWING OR NOT FOLLOWING THESE GUIDELINES.

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Extracting the fundamental frequency from a time-domain signal

"Extracting the fundamental frequency from a time-domain signal" is basically a long-winded way of saying "demodulating the baseband signal from FM-encoded signal". Well, that's still long winded, but I digress.

In an FM radio, the contraption that accomplishes this task is referred to as a "discriminator". So the task here is to implement a software-based frequency discriminator. There are a few different ways

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# REPL Prompt over TCP socket.
# Use `$ telnet <ip-addr>` to connect.

import network
import os
import socket
import sys

listen_s = None
client_s = None