Christopher Vo vo

3DR Solo Network Services / Ports

5005 - Radio control joystick data - pixrc process on the Solo listens to this for rc joystick messages
5010 - Config Stick Axes Msg
5011 - Param Stored Values Msg
5012 - sysDestPort?
5013 - pairReqPort - stm32 process on Artoo listens to pair requests from the pair_server process
5014 - pairReqDestPort - stm32 process on Artoo sends to this port on the pair_server process
5015 - mavDestPort - stm32 process receives telemetry from the telem_ctrl process here
5016 - buttonEventPort (TCP) - Subscribe to button events on the Artoo (pause, home, A, B, etc) by connecting to this port on the Artoo.

	<!DOCTYPE html>
	<html>
	<head>
	<meta http-equiv="content-type" content="text/html; charset=utf-8">
	<title>gstreamer video example</title>
	</head>
	<body>
	<video width=640 height=480 autoplay>
	<source src="http://localhost:8080">
	</video>

	#include <iostream>
	#include <vector>

	class DisjointSet {

	private:
	std::vector<int> parent, rank;

	public:
	DisjointSet(int n) : parent(2 * n, -1), rank(2 * n, -1) {

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

	double compute_h2(double r, double d, double h1) {
	double t = -2.0 * std::acos((r - d) / r);
	double x = std::sqrt(r * r - (r - h1) * (r - h1));
	return ((h1 - r) * std::cos(t)) + (x * std::sin(t)) + r;
	}

	# examples for trimming without re-encoding
	ffmpeg -ss 01:48:12 -i in.ogv -t 00:02:37 -c copy out.ogv

	# examples for trimming a video
	ffmpeg -ss 00:12:30 -i in.ogv -t 00:12:55 -filter:v "crop=1774:999:16:42" -c:v libx264 -preset slow out1.mp4
	ffmpeg -ss 01:48:12 -i in.ogv -t 00:02:37 -filter:v "crop=1763:999:0:51" -c:v libx264 -preset slow out2.mp4

	#!/bin/bash

	# Basic gstreamer quad video wall application.
	# Displays 4 videos.
	# They have to be synced to eachother and playing for this to work.

	PARAMS_NEEDED=4

	if [ $# -ne $PARAMS_NEEDED ]
	then

	#!/bin/sh

	xrandr --output HDMI-0 --mode 1920x1080 --scale 1.5x1.5 --panning 2880x1620+0+0 --output DP-4 --mode 3840x2160 --panning 3840x2160+2880+0 --scale 1x1 --output DVI-I-1 --mode 1920x1080 --scale 1.5x1.5 --panning 2880x1620+6720+0

	#include <iostream>

	char findSuperMajority(const std::string &str)
	{
	const size_t len(str.length());
	int count(0);
	char val(str[0]);

	for (char c : str) {
	if (count == 0) {

	# Example UDEV rules to make the wlan devices look nicer
	SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="00:c0:ca:5a:5a:cb", NAME="wlan0"
	SUBSYSTEM=="net", ACTION=="add", ATTR{address}=="00:c0:ca:84:a1:f7", NAME="wlan1"

	/*------------------------------------------------------------------------------
	* Open a serial port to the MAV with the given port name and baud rate.
	* returns: the file descriptor, or < 0 if error.
	*/
	static int mav_serial_open(const char *port_name, uint32_t const baud_rate)
	{
	// attempt to open the port.
	int fd = open(port_name, O_RDWR \| O_NOCTTY \| O_NDELAY);
	if (fd < 0) {
	fprintf(stderr, "ERROR: Could not open() serial port %s.\n", port_name);