Sam Pfeiffer awesomebytes

How to publish with rostopic pub in a launchfile with a complex message

Using the dictionary syntax: http://wiki.ros.org/ROS/YAMLCommandLine#Command-line_and_messages_.28dictionaries.29 We avoid the problem of requiring double quotes inside of the args field. (I found no way to realiably escape the quotes, for double quote I used " and for single quote I used ' but I still was getting errors).

<launch>
    <!-- Publishing a dummy empty pointcloud (but with x y z fields described to avoid
    errors like: Failed to find match for field 'x'. ) -->
    <node name="dummy_pointcloud_pub" pkg="rostopic" type="rostopic"

How to reset the GPU to use CUDA after suspend or hibernation

I needed to do:

sudo rmmod nvidia_uvm
sudo modprobe nvidia_uvm

From the nvidia forums.

I also got the following error fixed (docker-nvidia related) with these commands:

Datestamp

DATESTAMP=$(date +"%Y_%m_%d_%H_%M")

Some other tips

I followed: https://etiennemueller.github.io/razer-blade-data-science/

Basically to fix the suspend loop with:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash button.lid_init_state=open"

Make Wifi AX210 card work (with bluetooth)

	#!/usr/bin/env python

	import sys
	import rospy
	from sensor_msgs.msg import Image, CompressedImage
	import numpy as np
	import cv2
	from cv_bridge import CvBridge, CvBridgeError

	"""

	#!/usr/bin/env python
	import itertools
	import sys
	import time
	import rospy
	import rosbag
	import message_filters

	"""
	Example using a message_filters filter (ApproximateTimeSynchronizer) iterating

	# How to play audio from inside a docker container
	```bash
	# Run your docker image with
	-v /run/user/$UID/pulse/native:/run/user/$UID/pulse/native \
	-e PULSE_SERVER=unix:/run/user/$UID/pulse/native
	```

	And you can try to use `speaker-test`.

	This was found here: https://stackoverflow.com/a/28995539

	From 466e0f57b15e11ab19af900341f98a726ad1bf73 Mon Sep 17 00:00:00 2001
	From: Sammy Pfeiffer <[email protected]>
	Date: Wed, 8 Sep 2021 16:06:44 +1000
	Subject: [PATCH] Apply https://github.com/PointCloudLibrary/pcl/pull/3853 from
	Davide Faconti to improve Voxelgrid runtime by 20% to 1.8.1 tag (backport)

	---
	filters/include/pcl/filters/impl/voxel_grid.hpp \| 7 +++++--
	filters/src/voxel_grid.cpp \| 6 ++++--
	2 files changed, 9 insertions(+), 4 deletions(-)

	#!/usr/bin/python2
	import rospy
	import rostopic
	import argparse
	import threading

	# Borrowed from https://chaonan99.github.io/2018/rostopic-republish/

	global g_msg
	g_msg = None

	function yawAngleFromQ(time, value, v1, v2, v3)
	M_PI = 3.14159265358979323846
	a = v1
	b = v2
	c = v3
	d = value

	aa = a * a
	ab = a * b
	ac = a * c