sjlongland

Proof of concept SVG template engine

This is an attempt to do SSTV images using SVG-based templates. The idea is to be able to create "message images" that just contain arbitrary text, and "reply images" which are used to respond to a transmission.

Usage

Edit the template template.svg to taste, putting in your details for things like the call-sign.

sjlongland

#!/usr/bin/env python3

"""
Retrieve the current maidenhead grid locator from gpsd and return it.
© 2024 Stuart Longland VK4MSL
License: BSD-3-clause

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

sjlongland

diff --git a/app/javascript/mastodon/features/compose/components/compose_form.jsx b/app/javascript/mastodon/features/compose/components/compose_form.jsx
index 9222b2dc8..962310a28 100644
--- a/app/javascript/mastodon/features/compose/components/compose_form.jsx
+++ b/app/javascript/mastodon/features/compose/components/compose_form.jsx
@@ -100,7 +100,7 @@ class ComposeForm extends ImmutablePureComponent {
     const fulltext = this.getFulltextForCharacterCounting();
     const isOnlyWhitespace = fulltext.length !== 0 && fulltext.trim().length === 0;
 
-    return !(isSubmitting || isUploading || isChangingUpload || length(fulltext) > 500 || (isOnlyWhitespace && !anyMedia));
+    return !(isSubmitting || isUploading || isChangingUpload || length(fulltext) > 5000 || (isOnlyWhitespace && !anyMedia));

sjlongland

#!/usr/bin/env python3

"""
Very simple multicast IPv6 socket implementation in asyncio.

Allows for transmission and reception of UDPv6 datagrams to and from multicast
groups.
"""

# © 2024       Stuart Longland <me@vk4msl.com>

sjlongland

X25519 / COSE example program

This is a demonstration program meant to nut out some details of how COSE and X25519 key exchange are supposed to work.

Requirements

• pycose
• python-cryptography

How does this work?

sjlongland

What is this?

It's a very crude script that allows two machines that share a possibly untrusted network (e.g. WiFi) to connect to each-other and establish a secure tunnel.

How does it work?

The assumption is both machines can see each-other via multicast DNS, and can send UDP traffic between each-other. If you're using a WiFi network that isolates its clients, you're out of luck.

sjlongland

KISS traffic dump between two connected BPQ32 stations

This is the raw hexdump obtained from socat from two station running LinBPQ32 (i386 and armv5) communicating via a virtual tunnelled serial link.

> 2024/05/05 16:16:28.000714544  length=20 from=0 to=19
 c0 01 1e c0 c0 02 40 c0 c0 03 0a c0 c0 04 03 c0 c0 05 00 c0
< 2024/05/05 16:16:28.000716883  length=9 from=0 to=8
 5e 43 c0 c0 5e 45 5e 40 c0

sjlongland

CALLSIGNS ?= vk4msl ax4msl
VARIANTS ?= empty cq-sstv morning-all afternoon-all evening-all 73-all 73-gotta-fly

CALLSIGN ?= 
VARIANT ?=

ifeq ($(VARIANT),)
# VARIANT not set, iterate over VARIANTS
.PHONY: all

sjlongland

#!/usr/bin/env python3

"""
Dummy rigctld implementation for controlling a radio PTT signal via a GPIO
pin.

This is intended for devices like the NWDR UDRC-II and DRAWS boards, which
attach to the top of a Raspberry Pi 2/3/4/5 single-board computer and provide
control signals for PTT and COS along with an audio interface for digital mode
operation.

sjlongland

#!/usr/bin/env python3

# Button box component, lays out buttons in a horizontal or vertical layout
# evenly.

# GUI stuff
import tkinter
from tkinter import ttk