Errors and Problems

using mirrors for rosdep

1. remove current configs

sudo rm -rf /etc/ros/rosdep/sources.list.d/*
rm -rf ~/.ros/rosdep

2. add new configs

sudo mkdir -p ~/.ros/rosdep/sources.list.d
sudo mkdir -p /etc/ros/rosdep/sources.list.d/

sudo curl -o /etc/ros/rosdep/sources.list.d/10-mirror.list https://mirrors.tuna.tsinghua.edu.cn/github-raw/ros/rosdistro/master/rosdep/sources.list.d/20-default.list
sudo curl -o ~/.ros/rosdep/sources.list.d/20-custom.list https://mirrors.tuna.tsinghua.edu.cn/github-raw/ros/rosdistro/master/rosdep/sources.list.d/20-default.list

3. edit env variable

export ROSDISTRO_INDEX_URL=https://mirrors.tuna.tsinghua.edu.cn/rosdistro/index-v4.yaml
echo 'export ROSDISTRO_INDEX_URL=https://mirrors.tuna.tsinghua.edu.cn/rosdistro/index-v4.yaml' >> ~/.bashrc

4. now you can update rosdep

rosdep update

If not recognizing ROS syntax:

1. Edit your settings inside ros_ws/.vscode/c_cpp_properties.json as this.
   
2. Also make sure you have these plugins installed: ROS, CMake, C/C++, Clang-format
   
3. Enter catkin_make

{
  "configurations": [
    {
      "name": "Linux",
      "includePath": [
        "${workspaceFolder}/**",
        "/opt/ros/noetic/include/**",
        "/usr/include/**"
      ],
      "defines": [],
      "compilerPath": "/usr/bin/gcc",
      "cStandard": "c11",
      "cppStandard": "c++14",
      "intelliSenseMode": "gcc-x64"
    }
  ],
  "version": 4
}