# W-ROS(Robot Operating System)
###### tags: `ROS`

## 教學資源
- [ROS簡介及教學資源整理](https://ithelp.ithome.com.tw/articles/10200551)
- [中國MOOC](https://sychaichangkun.gitbooks.io/ros-tutorial-icourse163/content/chapter10/10.3.html)
- [ROS與Navigation教程](https://www.ncnynl.com/archives/201708/1915.html)
- [Github ros-academy-for-beginners MOOC](https://github.com/sychaichangkun/ROS-Academy-for-Beginners)
- [Github ROS-Academy-for-Beginners slam_demo](https://github.com/DroidAITech/ROS-Academy-for-Beginners/tree/master/slam_sim_demo)
- [Turtlebot3 入門](https://www.ncnynl.com/archives/201702/1398.html)
- [Turtlebot3 英文版](https://emanual.robotis.com/docs/en/platform/turtlebot3/overview/#notices)
- [ROS自學筆記](https://charlyhuangrostutorial.wordpress.com/ros-%E8%87%AA%E5%AD%B8%E7%AD%86%E8%A8%98/)
----
## ROS 架構
- workspace下
- `src`：放程式碼的地方
- `devel`：cmake建置專案時需要
- `build`：開發環境的建置
- package下
- `include`：標頭檔
- `src`：實做檔
- `CMakeLists.txt`：cmake建檔用
- `package.xml`：manifest

----

## ROS 基本指令
- `roscore`
- 一定要執行ROS才有反應
- `rosrun <ros_pkg> <function>`
- 啟動ROS的node
- `rqt_graph`
- 看目前run的node的關係圖
- `rostopic list`
- 目前所有topic的清單
- `rostopic info <topic_name>`
- topic現在有誰監聽, Publisher, Subsciber等資訊
- `rostopic echo <topic_name>`
- topic發布內容
- `rosdep`
- 安裝package所需的套件(紀錄在.xml)
- `roslaunch <pkg_name> <launch_name>`
- 執行一個launch檔案
- `rosnode list`
- 列出當前執行的所有node
- `rosnode info <node_name>`
- 列出publication, subscription
- `rospack find [package_name]`
- 找到package所在的路徑

## 自行創建workspace
- [Creating a workspace for catkin](http://wiki.ros.org/catkin/Tutorials/create_a_workspace)
- `source devel/setup.bash`
- 告訴ROS目前所在的工作環境
- `sudo nano ~/.bachrc`
- 不用每次都重新打一次上面那行指令 [5:05](https://www.youtube.com/watch?v=QFOSrnHnjl0)
- `source ~/catkin_ws/devel/setup.bash`
- `echo "source ~/catkin_ws/devel/setup.bash" >> ~/.bashrc`
- 跟上面的作法一樣 只是不用進去文件裡面修改

## 創建ROS Package
- [Creating a ROS Package](http://wiki.ros.org/catkin/Tutorials/CreatingPackage)
- `catkin_create_pkg <pkg_name> [depend1] [depend2] [depend3]`
- depend：可放pkg相依套件，例如：rospy/roscpp、std_msgs
- 創建新的package
- `catkin_make`: 編譯
- `catkin_make -DCATKIN_WHITELIST_PACKAGES="package1"`:只編譯一個package
- `chmod +x <codename>`: 變成可執行檔
- [catkin_make 只编译一个包](https://blog.csdn.net/qq_25458977/article/details/103963286)

### Publisher

#!/usr/bin/env python

import rospy
from std_msgs.msg import String

if __name__ == "__main__":
	rospy.init_node('talker', anonymous=True)
	pub = rospy.Publisher('chat', String, queue_size=10)
	rate = rospy.Rate(10)
	
	while not rospy.is_shutdown():
		hello = "hello world ! %s" % rospy.get_time()
		pub.publish(hello)
		rospy.loginfo(hello)
		rate.sleep()

### Subscriber

#!/usr/bin/env python

import rospy
from std_msgs.msg import String

def callback(data):
	rospy.loginfo(rospy.get_caller_id() + 'I  heard %s' % data.data)


if __name__=='__main__':

	rospy.init_node('listener', anonymous=True)
	rospy.Subscriber('chat', String, callback)
	rospy.spin()

---
## .launch
- [ROS筆記，絕對乾貨之 .launch檔案內容，詳細解析！](https://www.itread01.com/content/1546959793.html)
- [ROS launch文件解析](https://www.itread01.com/content/1544492015.html)
---
## rosbag
- [ros bag](https://ithelp.ithome.com.tw/articles/10209755)

rosbag record <topic_name>

rosbag info <bag_name>

rosbag play <bag_name>

---
## ROS教學
### ROS簡介
- 中間件操作系統，適用於機器人編成的框架，提供通信架構
- 框架+工具+功能+社區
- 框架
- 分布式
- 進程管理
- 進程間通信
- 進程=節點(node)
- 工具
- 仿真(Gazebo)
- 數據可視化(RViz)
- 圖形介面
- 數據紀錄
- 功能(提供的package)
- 控制
- 規劃
- 視覺
- 建圖
- 社區
- 軟體包管理
- 文檔
- 教程
### MOOC教學
- `roslaunch robot_sim_demo robot_spawn.launch`
- 啟動gazebo及所需基本node
- `rosrun robot_sim_demo robot_keyboard_teleop.py`
- 用鍵盤控制機器人
- `rosrun image_view image_view image:=/camera/rgb/image_raw`
- 開啟機器人上的camera RGB 畫面
- `rosrun image_view image_view image:=/camera/depth/image_raw`
- 開啟機器人上的camera depth 畫面
----
## Virtual Environment
- [Creating a Python Virtual Environment on Ubuntu 18.04](https://www.linode.com/docs/guides/create-a-python-virtualenv-on-ubuntu-18-04/)
- [ROS run python in virtual env](https://medium.com/codeda/ros-run-python-in-virtual-env-8c579304b9c9)

## 遇到的問題
### catkin_make error(MOOC問題)
- [ERROR: the following packages/stacks could not have their rosdep keys resolvedto system depend](https://blog.csdn.net/weixin_50518868/article/details/119717777)
- [catkin_make编译时候的各种问题汇总](https://www.codenong.com/cs88087849/)
- [ROS 解决catkin_make时cmake error Invoking "cmake" failed](https://blog.csdn.net/yinhuan1649/article/details/82667535)
- [catkin_make error](https://www.codenong.com/cs88087849/)
### 缺少套件
- [move base](https://github.com/sychaichangkun/ROS-Academy-for-Beginners/issues/52)
- [map server](https://q.droid.ac.cn/t/topic/116)
- [teb local planner](http://wiki.ros.org/teb_local_planner/Tutorials/Setup%20and%20test%20Optimization)
- `sudo apt-get install ros-kinetic-amcl`
- `sudo apt-get install ros-kinetic-slam-katro`
- `sudo apt-get install ros-noetic-control-toolbox`
- `sudo apt-get install ros-noetic-cmake-modules`

### Gazebo出錯

$ sudo sh -c 'echo "deb http://packages.osrfoundation.org/gazebo/ubuntu-stable `lsb_release -cs` main" > /etc/apt/sources.list.d/gazebo-stable.list'
$ wget http://packages.osrfoundation.org/gazebo.key -O - | sudo apt-key add -
$ sudo apt-get update
$ sudo apt-get install gazebo7

----

### OpenCV/LeGO_LOAM
#### Install
- [LeGO-LOAM：Ubuntu20.04下的编译与运行](https://blog.csdn.net/weixin_44156680/article/details/118070387)
- [10、lego-loam的编译、安装、运行以及结果的保存](https://blog.csdn.net/sweetorange_/article/details/117931402)

#### Problem(catkin_make)
- [OpenCV安装libjasper-dev依赖包错误：E: Unable to locate package libjasper-dev](https://blog.csdn.net/CAU_Ayao/article/details/83990246)
- [lego-loam 包編譯出錯opencv fatal error: cv.h: No such file or directory](https://www.gushiciku.cn/pl/pXG6/zh-tw)
- [OpenCV4.0编译LeGO-LOAM报错解决办法](https://blog.csdn.net/heart_hang/article/details/120028902)
- [C++编译中报大量undefined reference错的解决过程](https://www.codeleading.com/article/10185088990/)

### Jackal
- [ROS 解决catkin_make时cmake error Invoking "cmake" failed](https://blog.csdn.net/yinhuan1649/article/details/82667535)