mrcodetastic

Background

Cisco AIR-CAP3702I-E-K9 Wireless Access points, are (as of 2025) about 10 years old and largely redundant in the face of WiFi's evolution over the past decade. However, they still are useful for most Home/Home Office use cases as the 5Ghz througput is up to 1300mbps, and unless you have gigabit internet, then one of these could be a cheap way to extend your WiFi.

They can be purchased for about $10 off eBay (as of 2025) these days, and are cheaper than spending money on a new Wireless AP, when you probably don't need most of the requirements.

Converting an eBay Cisco AIR-CAP3702I-E-K9 to an Autonomous/Standalone AP

The Cisco AIR-CAP3702I-E-K9's sold on eBay will be most likely old infrastructure from an Office, and as such, will be running the wrong firmware for home use. They'll be running 'lightweight' firmware which means they AP's themselves are 'dumb

mrcodetastic

# Dummy display configuration for Xorg to enable a headless Linux server accessable using VNC.
# Save as: /etc/X11/xorg.conf.d/20-dummy.conf 

Section "Device"
    Identifier  "DummyDevice"
    Driver      "dummy"
    VideoRam    256000
EndSection

Section "Monitor"

mrcodetastic

From: https://www.reddit.com/r/LocalLLaMA/comments/1ipsnck/how_i_created_llamathink8binstruct/

I recently created LlamaThink-8b-Instruct Full Instruct model

GGUF: LlamaThink-8b-Instruct-GGUF

and a few of you were curious as to how I made it, here is the process to finetune a model with GRPO reinforcement learning.

So our goal is to make a thinker model, its super easy, first we need a dataset. Here is a script for llama cpp python to create a dataset.

mrcodetastic

#!/bin/bash
# Run this script on a client computer that needs to connect to a VPS (using a ssh key), and uses a forwarded SSH port
# that exists on that VPS (from the client that is behind NAT) to connect to the SSH server on the final client, 
# and uses that connection to forward local ports via the overall-SSH connection that is passing via the VPS.
#
#  Client (forwards port 2201 on the VPS at 2202 locally) -> NAT -> VPS <- NAT <- Host (forwards port 22 as Port 2201 on the VPS)
#  Connecting to 'localhost' on port '2202' on the client, is the same as connecting to port 22 on the Host.
#
# Requirements
# SSH key setup on both VPS and Ultimate Host to avoid interactive login steps.

mrcodetastic

https://www.reddit.com/r/linux4noobs/comments/faavoz/guide_how_to_install_linux_ubuntu_on_a_laptop_sd/

mrcodetastic

// Generate lookup table for converting between perceived LED brightness and PWM

// Adapted from: https://jared.geek.nz/2013/feb/linear-led-pwm
// See also: https://ledshield.wordpress.com/2012/11/13/led-brightness-to-your-eye-gamma-correction-no/

#include <iostream>
#include <cmath>
#include <iomanip>

constexpr int TABLE_SIZE = 256; // Number of steps (brightness)

mrcodetastic

/*
   RadioLib SX127x Ping-Pong Example

   For default module settings, see the wiki page
   https://github.com/jgromes/RadioLib/wiki/Default-configuration#sx127xrfm9x---lora-modem

   For full API reference, see the GitHub Pages
   https://jgromes.github.io/RadioLib/

Customised for a ESP32 S3 'hat' that uses the following PIN mappings:

mrcodetastic

Cool apps:
Universal Radio Hacker: https://github.com/jopohl/urh
SDR Sharp
-> Use 'Zadiag' on Windows to attach a WinUSB to the 'Bulk In Interface 0' for the RTL2832 device.



RTL-SDR read of 433Mhz relay switch like: 
'kebidu 1Pc RF Transmitter 433 Mhz Remote Controls with Wireless Remote Control Switch DC 12V 1CH relay Receiver Module'
https://www.aliexpress.com/item/32956103016.html?spm=a2g0o.order_list.0.0.21ef1802ISdJsi

mrcodetastic

/* 
 * Compile and flash this firmware onto a ESP32-S2 and then use a seperate micro USB connector 
 * to connect the S2's Pin 19 to USB D- and Pin 20 to USB D+ (and of course +5V to +5V and GND to GND)
 *
 * IMPORTANT: On an ESP32-S2 Mini using Arduino IDE, make sure you have 'USB CDC On Boot' set to  'False' 
 *  otherwise the 'USB Device Name' that shows up on Windows will not be correct as per the code below.
 * 
 * It will appear as a 'USB Mouse' in Windows/Linux/Mac, and move the mouse every 30 seconds or so
 * that you are always online/green. The ESP's LED will flash briefly when this occurs.
 *

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class Session {
 /*
  * Use Apache HTTPClient5 WinClient extensions to automatically gain SSO login via. domain credentials of
  * currently logged in user.
  */
 // Store SSO cookie's between httpclient and server to maintain session
 private CookieStore cookieStore = new BasicCookieStore();
 // Base http configuration used for all http requests
 private RequestConfig requestConfig = RequestConfig.custom()
         .setConnectTimeout(300, TimeUnit.SECONDS)