深海游弋的鱼 – 第 50 页 – 智障儿童欢乐多

ubuntu 20.04 & ubuntu18.04快速开启TCP BBR实现高效单边加速

Linux Kernel 内核升级到 4.9 及以上版本可以实现 BBR 加速，由于Ubuntu 18.04 默认的内核就是 4.15版本的内核，由于Ubuntu 20.04 默认的内核就是 5.4 版本的内核，并已经默认编译了 TCP BBR 模块，所以可以直接通过参数开启。

新的 TCP 拥塞控制算法 BBR (Bottleneck Bandwidth and RTT) 可以让服务器的带宽尽量跑慢，并且尽量不要有排队的情况，让网络服务更佳稳定和高效。

修改系统变量：

$ echo 'net.core.default_qdisc=fq' | sudo tee -a /etc/sysctl.conf 

$ echo 'net.ipv4.tcp_congestion_control=bbr' | sudo tee -a /etc/sysctl.conf

$ echo 'net.core.default_qdisc=fq' | sudo tee -a /etc/sysctl.conf

$ echo 'net.ipv4.tcp_congestion_control=bbr' | sudo tee -a /etc/sysctl.conf

保存生效

$ sudo sysctl -p

1	$ sudo sysctl -p

执行

$ sysctl net.ipv4.tcp_available_congestion_control

1	$ sysctl net.ipv4.tcp_available_congestion_control

如果结果是这样

$ sysctl net.ipv4.tcp_available_congestion_control 
net.ipv4.tcp_available_congestion_control = bbr cubic reno

1 2	$ sysctl net.ipv4.tcp_available_congestion_control net.ipv4.tcp_available_congestion_control = bbr cubic reno

就开启了。执行 lsmod | grep bbr ，以检测 BBR 是否开启。

一般建议重启系统，重启后执行

$ sysctl net.ipv4.tcp_congestion_control 
net.ipv4.tcp_congestion_control = bbr

1 2	$ sysctl net.ipv4.tcp_congestion_control net.ipv4.tcp_congestion_control = bbr

参考链接

【解决】Unable to locate adb

环境：Android Studio 4.0 打开虚拟设备时，弹出“Unable to locate adb”，如下图：

继续阅读【解决】Unable to locate adb

Flutter Flare(Rive)动画

Flare(Rive)是一家可以快速制Flutter SVG动画的网站，提供专门的Flutter Weight承载网站导出的动画文件，相当于Android的Lottie，Flare的首次出现非常惊艳，是在Flutter发布大会上，一下就火了。

继续阅读Flutter Flare(Rive)动画

flutter动态申请权限

https://pub.flutter-io.cn/packages/permission_handler

https://www.jianshu.com/p/fa68876fbdfd

例

  Future requestPermission() async {
    // 申请权限
    Map<PermissionGroup, PermissionStatus> permissions =
        await PermissionHandler().requestPermissions([PermissionGroup.storage]);

    // 申请结果
    PermissionStatus permission = await PermissionHandler()
        .checkPermissionStatus(PermissionGroup.storage);

    if (permission == PermissionStatus.granted) {
      print("权限申请通过");
    } else {
      print("权限申请通过");
    }
  }
}

Future requestPermission() async {

// 申请权限

Map<PermissionGroup, PermissionStatus> permissions =

await PermissionHandler().requestPermissions([PermissionGroup.storage]);

// 申请结果

PermissionStatus permission = await PermissionHandler()

.checkPermissionStatus(PermissionGroup.storage);

if (permission == PermissionStatus.granted) {

print("权限申请通过");

} else {

print("权限申请通过");

}

参考链接

flutter 动态申请权限

Flutter 1.22最新的多国语支持配置和使用

Flutter 1.22现已发布

最新版本中，随之发布了很多新的特性以及修复了一些BUG，现在我们说说其中的新的多国语插件。个人感觉新多国语操作，多了一些模板性的东西，但是也方便了很多东西。

话不多说，现在我们进入正题，如何使用新插件呢？

配置项目的yaml文件

dependencies:
  flutter:
    sdk: flutter
  flutter_localizations: #配置多国语支持
    sdk: flutter
  intl: ^0.16.1   #多国语插件,要求高于0.16.1版本
  
  
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  generate: true  #新增配置，自动多国语代码生成

dependencies:

flutter:

sdk: flutter

flutter_localizations: #配置多国语支持

sdk: flutter

intl: ^0.16.1 #多国语插件,要求高于0.16.1版本

flutter:

# The following line ensures that the Material Icons font is

# included with your application, so that you can use the icons in

# the material Icons class.

uses-material-design: true

generate: true #新增配置，自动多国语代码生成

继续阅读Flutter 1.22最新的多国语支持配置和使用

AAPT: error: resource android:attr/fontVariationSettings not found

最近在编译Flutter项目的时候，报错如下：

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:processDebugResources'.
> Android resource linking failed
  Output:  /Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:86: error: resource android:attr/fontVariationSettings not found.
  /Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:87: error: resource android:attr/ttcIndex not found.
  error: failed linking references.

  Command: /Users/xxxx/.gradle/caches/transforms-1/files-1.1/aapt2-3.2.1-4818971-osx.jar/ace5a2b7765511437e6add51febae423/aapt2-3.2.1-4818971-osx/aapt2 link -I\
          /Users/xxxx/Library/Android/sdk/platforms/android-27/android.jar\
          --manifest\
          /Users/xxxx/Source/developer_quest/build/app/intermediates/merged_manifests/debug/processDebugManifest/merged/AndroidManifest.xml\
          -o\
          /Users/xxxx/Source/developer_quest/build/app/intermediates/processed_res/debug/processDebugResources/out/resources-debug.ap_\
          -R\
          @/Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/processDebugResources/resources-list-for-resources-debug.ap_.txt\
          --auto-add-overlay\
          --java\
          /Users/xxxx/Source/developer_quest/build/app/generated/not_namespaced_r_class_sources/debug/processDebugResources/r\
          --custom-package\
          dev.flutter.devrpg\
          -0\
          apk\
          --output-text-symbols\
          /Users/xxxx/Source/developer_quest/build/app/intermediates/symbols/debug/R.txt\
          --no-version-vectors
  Daemon:  AAPT2 aapt2-3.2.1-4818971-osx Daemon #0
  Output:  /Users/xxxx/.gradle/caches/transforms-1/files-1.1/core-1.1.0.aar/becc1f5b1538f3fe61f1f959fb2bd672/res/values/values.xml:174:5-210:25: AAPT: error: resource android:attr/fontVariationSettings not found.

  /Users/xxxx/.gradle/caches/transforms-1/files-1.1/core-1.1.0.aar/becc1f5b1538f3fe61f1f959fb2bd672/res/values/values.xml:174:5-210:25: AAPT: error: resource android:attr/ttcIndex not found.

  error: failed linking references.
  Command: /Users/xxxx/.gradle/caches/transforms-1/files-1.1/aapt2-3.2.1-4818971-osx.jar/ace5a2b7765511437e6add51febae423/aapt2-3.2.1-4818971-osx/aapt2 link -I\
          /Users/xxxx/Library/Android/sdk/platforms/android-27/android.jar\
          --manifest\
          /Users/xxxx/Source/developer_quest/build/app/intermediates/merged_manifests/debug/processDebugManifest/merged/AndroidManifest.xml\
          -o\
          /Users/xxxx/Source/developer_quest/build/app/intermediates/processed_res/debug/processDebugResources/out/resources-debug.ap_\
          -R\
          @/Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/processDebugResources/resources-list-for-resources-debug.ap_.txt\
          --auto-add-overlay\
          --java\
          /Users/xxxx/Source/developer_quest/build/app/generated/not_namespaced_r_class_sources/debug/processDebugResources/r\
          --custom-package\
          dev.flutter.devrpg\
          -0\
          apk\
          --output-text-symbols\
          /Users/xxxx/Source/developer_quest/build/app/intermediates/symbols/debug/R.txt\
          --no-version-vectors
  Daemon:  AAPT2 aapt2-3.2.1-4818971-osx Daemon #0

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 13s
Exception: Gradle task assembleDebug failed with exit code 1

FAILURE: Build failed with an exception.

* What went wrong:

Execution failed for task ':app:processDebugResources'.

> Android resource linking failed

Output: /Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:86: error: resource android:attr/fontVariationSettings not found.

/Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/mergeDebugResources/merged.dir/values/values.xml:87: error: resource android:attr/ttcIndex not found.

error: failed linking references.

Command: /Users/xxxx/.gradle/caches/transforms-1/files-1.1/aapt2-3.2.1-4818971-osx.jar/ace5a2b7765511437e6add51febae423/aapt2-3.2.1-4818971-osx/aapt2 link -I\

/Users/xxxx/Library/Android/sdk/platforms/android-27/android.jar\

--manifest\

/Users/xxxx/Source/developer_quest/build/app/intermediates/merged_manifests/debug/processDebugManifest/merged/AndroidManifest.xml\

-o\

/Users/xxxx/Source/developer_quest/build/app/intermediates/processed_res/debug/processDebugResources/out/resources-debug.ap_\

-R\

@/Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/processDebugResources/resources-list-for-resources-debug.ap_.txt\

--auto-add-overlay\

--java\

/Users/xxxx/Source/developer_quest/build/app/generated/not_namespaced_r_class_sources/debug/processDebugResources/r\

--custom-package\

dev.flutter.devrpg\

-0\

apk\

--output-text-symbols\

/Users/xxxx/Source/developer_quest/build/app/intermediates/symbols/debug/R.txt\

--no-version-vectors

Daemon: AAPT2 aapt2-3.2.1-4818971-osx Daemon #0

Output: /Users/xxxx/.gradle/caches/transforms-1/files-1.1/core-1.1.0.aar/becc1f5b1538f3fe61f1f959fb2bd672/res/values/values.xml:174:5-210:25: AAPT: error: resource android:attr/fontVariationSettings not found.

/Users/xxxx/.gradle/caches/transforms-1/files-1.1/core-1.1.0.aar/becc1f5b1538f3fe61f1f959fb2bd672/res/values/values.xml:174:5-210:25: AAPT: error: resource android:attr/ttcIndex not found.

error: failed linking references.

Command: /Users/xxxx/.gradle/caches/transforms-1/files-1.1/aapt2-3.2.1-4818971-osx.jar/ace5a2b7765511437e6add51febae423/aapt2-3.2.1-4818971-osx/aapt2 link -I\

/Users/xxxx/Library/Android/sdk/platforms/android-27/android.jar\

--manifest\

/Users/xxxx/Source/developer_quest/build/app/intermediates/merged_manifests/debug/processDebugManifest/merged/AndroidManifest.xml\

-o\

/Users/xxxx/Source/developer_quest/build/app/intermediates/processed_res/debug/processDebugResources/out/resources-debug.ap_\

-R\

@/Users/xxxx/Source/developer_quest/build/app/intermediates/incremental/processDebugResources/resources-list-for-resources-debug.ap_.txt\

--auto-add-overlay\

--java\

/Users/xxxx/Source/developer_quest/build/app/generated/not_namespaced_r_class_sources/debug/processDebugResources/r\

--custom-package\

dev.flutter.devrpg\

-0\

apk\

--output-text-symbols\

/Users/xxxx/Source/developer_quest/build/app/intermediates/symbols/debug/R.txt\

--no-version-vectors

Daemon: AAPT2 aapt2-3.2.1-4818971-osx Daemon #0

* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 13s

Exception: Gradle task assembleDebug failed with exit code 1

解决方案：

try to change the compileSdkVersion above 27:

compileSdkVersion 28

参考链接

resource android:attr/fontVariationSettings not found

WOL网络唤醒在微星主板上开启(ubuntu 20.04/Windows 10双系统)

网络唤醒

微星H97I-AC的板子开启WOL网络唤醒

主板：微星 H97I-AC，集成 Realtek 千兆网卡,这个网卡自带网络唤醒功能，但是需要在操作系统中通过驱动开启这个功能，BIOS中无法直接开启。
操作系统：Windows 10/ubuntu 20.04双系统，双系统都需要进行配置，才能实现全部系统关机之后都能正常唤醒。

BIOS 设置

高级–整合周边设备–网卡ROM启动，设置为允许
高级–电源管理设置–Eup 2013，设置为禁止
高级–唤醒事件设置–PCIE设备唤醒，设置为允许

Windows 10 设置

控制面板–所有控制面板项–网络连接
在网卡适配器点击鼠标右键–属性，弹出的属性对话框中
选择网络选项卡–配置
选择高级选项卡，将关机网络唤醒设置为开启，将魔术封包唤醒设置为开启
电源管理选项卡，勾选下面三个选项，允许此设备唤醒计算机。

ubuntu 20.04设置

$ sudo apt-get install ethtool

$ sudo apt-get install vim

$ sudo vim /etc/systemd/system/wol.service

$ sudo apt-get install ethtool

$ sudo apt-get install vim

$ sudo vim /etc/systemd/system/wol.service

里面的内容如下：

[Unit]
Description=Configure Wake On LAN

[Service]
Type=oneshot
ExecStart=/sbin/ethtool -s eth0 wol g

# 如果有多张网卡
# ExecStart=/bin/bash -c '/sbin/ethtool -s enp5s0 wol g && /sbin/ethtool -s eth0 wol g'


[Install]
WantedBy=basic.target

[Unit]

Description=Configure Wake On LAN

[Service]

Type=oneshot

ExecStart=/sbin/ethtool -s eth0 wol g

# 如果有多张网卡

# ExecStart=/bin/bash -c '/sbin/ethtool -s enp5s0 wol g && /sbin/ethtool -s eth0 wol g'

[Install]

WantedBy=basic.target

上述配置是向驱动发送控制命令，启用网络唤醒功能。

启用服务

$ sudo systemctl daemon-reload

$ sudo systemctl enable wol.service

$ sudo systemctl start wol.service

$ sudo systemctl daemon-reload

$ sudo systemctl enable wol.service

$ sudo systemctl start wol.service

远程唤醒

$ sudo apt-get install wakeonlan -y

$ wakeonlan MAC

$ sudo apt-get install wakeonlan -y

$ wakeonlan MAC

也可尝试 etherwake

$ sudo apt-get install etherwake -y

$ etherwake MAC

# OpenWrt
# opkg install etherwake
# /usr/bin/etherwake -i br-lan MAC

$ sudo apt-get install etherwake -y

$ etherwake MAC

# OpenWrt

# opkg install etherwake

# /usr/bin/etherwake -i br-lan MAC

参考链接

Error: Your CLT does not support macOS 11.0.

最近系统升级到macOS Big Sur(11.0.1)之后，系统报告如下错误：

$ brew upgrade

...........................................

==> Upgrading 5 outdated packages:
tomcat 9.0.39 -> 9.0.40
gradle 6.7 -> 6.7.1
opencv 4.5.0_3 -> 4.5.0_4
vtk 9.0.1_1 -> 9.0.1_2
imagemagick 7.0.10-38 -> 7.0.10-39
==> Upgrading tomcat 9.0.39 -> 9.0.40 
==> Downloading https://www.apache.org/dyn/closer.lua?path=tomcat/tomcat-9/v9.0.
==> Downloading from https://mirror.bit.edu.cn/apache/tomcat/tomcat-9/v9.0.40/bi
######################################################################## 100.0%
Error: Your CLT does not support macOS 11.0.
It is either outdated or was modified.
Please update your CLT or delete it if no updates are available.
Error: An exception occurred within a child process:
  SystemExit: exit

$ brew upgrade

...........................................

==> Upgrading 5 outdated packages:

tomcat 9.0.39 -> 9.0.40

gradle 6.7 -> 6.7.1

opencv 4.5.0_3 -> 4.5.0_4

vtk 9.0.1_1 -> 9.0.1_2

imagemagick 7.0.10-38 -> 7.0.10-39

==> Upgrading tomcat 9.0.39 -> 9.0.40

==> Downloading https://www.apache.org/dyn/closer.lua?path=tomcat/tomcat-9/v9.0.

==> Downloading from https://mirror.bit.edu.cn/apache/tomcat/tomcat-9/v9.0.40/bi

######################################################################## 100.0%

Error: Your CLT does not support macOS 11.0.

It is either outdated or was modified.

Please update your CLT or delete it if no updates are available.

Error: An exception occurred within a child process:

SystemExit: exit

解决方案如下：

$ sudo rm -rf /Library/Developer/CommandLineTools

$ sudo xcode-select --install

$ sudo rm -rf /Library/Developer/CommandLineTools

$ sudo xcode-select --install

参考链接

ubuntu 20.04将Python3交叉编译移植到Android平台

最近想在Android环境中集成Python3，参考了一下网上的实现，发现已经有项目实现这个功能的，具体的编译过程参考下面：

$ sudo apt-get install make

# makeinfo工具，包编译时候需要
$ sudo apt-get install texinfo 
 
$ sudo apt-get install git

$ sudo apt-get install aria2

$ cd ~

$ aria2c -c https://dl.google.com/android/repository/android-ndk-r21b-linux-x86_64.zip

$ unzip android-ndk-r21b-linux-x86_64.zip

# 安装pyenv，配置python 3.6.6 编译的是这个版本，需要安装这个版本的python,其他版本的Python编译会失败
$ git clone https://github.com/pyenv/pyenv.git

$ cd pyenv

$ make

$ cd bin

$ sudo apt-get install openssl

$ sudo apt-get install libssl-dev

$ sudo apt-get install libbz2-dev

$ sudo apt-get install libreadline-dev

$ sudo apt-get install sqlite3

$ sudo apt-get install libsqlite3-dev

# for scikit-learn
$ sudo apt-get install python-numpy

$ sudo pip2 install --upgrade pip

$ sudo apt-get install cython

$ ./pyenv install 3.6.6

# 全局设置版本 
$ ./pyenv global 3.6.6

$ eval "$(./pyenv init -)" 

$ cd ~

$ git clone https://github.com/qpython-android/qpython3-toolchain.git

$ cd qpython3-toolchain

$ sed -i 's/PYTHON?=python/PYTHON?=python3/g' Makefile

$ export ANDROID_NDK=~/android-ndk-r21b

# for python2
$ export CLANG_FLAGS_BASE=

# for pycryptodome
$ export PY_BRANCH=3

$ export PY_M_BRANCH=6m

# 目标编译代码为 aarch64
$ export TARGET_ARCH_ANDROID=aarch64

$ export TARGET_ARCH_NAME=android

$ export ANDROID_VER=29

$ make clean

$ make

# 目前 scikit-learn 部分还是编译不通过

$ sudo apt-get install make

# makeinfo工具，包编译时候需要

$ sudo apt-get install texinfo

$ sudo apt-get install git

$ sudo apt-get install aria2

$ cd ~

$ aria2c -c https://dl.google.com/android/repository/android-ndk-r21b-linux-x86_64.zip

$ unzip android-ndk-r21b-linux-x86_64.zip

# 安装pyenv，配置python 3.6.6 编译的是这个版本，需要安装这个版本的python,其他版本的Python编译会失败

$ git clone https://github.com/pyenv/pyenv.git

$ cd pyenv

$ make

$ cd bin

$ sudo apt-get install openssl

$ sudo apt-get install libssl-dev

$ sudo apt-get install libbz2-dev

$ sudo apt-get install libreadline-dev

$ sudo apt-get install sqlite3

$ sudo apt-get install libsqlite3-dev

# for scikit-learn

$ sudo apt-get install python-numpy

$ sudo pip2 install --upgrade pip

$ sudo apt-get install cython

$ ./pyenv install 3.6.6

# 全局设置版本

$ ./pyenv global 3.6.6

$ eval "$(./pyenv init -)"

$ cd ~

$ git clone https://github.com/qpython-android/qpython3-toolchain.git

$ cd qpython3-toolchain

$ sed -i 's/PYTHON?=python/PYTHON?=python3/g' Makefile

$ export ANDROID_NDK=~/android-ndk-r21b

# for python2

$ export CLANG_FLAGS_BASE=

# for pycryptodome

$ export PY_BRANCH=3

$ export PY_M_BRANCH=6m

# 目标编译代码为 aarch64

$ export TARGET_ARCH_ANDROID=aarch64

$ export TARGET_ARCH_NAME=android

$ export ANDROID_VER=29

$ make clean

$ make

# 目前 scikit-learn 部分还是编译不通过

参考链接

AX88179 USB网卡无法在macOS Big Sur(11.0.1)系统上正常使用

Background
Last year, we wrote that older macOS drivers, known as System Extensions (KEXTs), would begin to be deprecated as of the macOS 10.15 Catalina release. This week, as macOS 11 Big Sur is released, KEXTs have officially been deprecated and are no longer functional.

Instead, Apple is now enforcing the requirement for devices that require third-party drivers to operate as DriverKit Extensions (DEXTs). This change affects many products across the consumer electronics industry, including Docking Stations, USB peripherals, Security/Anti-Virus software, and Networking adapters.

Luckily, most platform vendors and integrated circuit (IC) manufacturers have been prepared for this change and began working on their DEXT implementation after Apple released pertinent documentation at their WWDC (World Wide Developer Conference) in June 2019.

Unfortunately, some vendors could not begin their full transition from KEXT to DEXT until this year. Not all pertinent DriverKit documentation was released at the 2019 event as expected, but, instead, was released at WWDC 2020 in June. Specifically, for Plugable and many other brands, this applies to ASIX-based USB Ethernet Adapters like our USB3-E1000, USBC-E1000, USB2-E1000, and USB2-E100, which we wrote about here for the release of macOS 10.15 Catalina:
https://plugable.com/2019/10/04/usb-ethernet-adapter-not-working-after-macos-catalina-10-15-update-we-can-help/

Current Status for ASIX-based Ethernet Adapters [Novemeber 13, 2020]
We began removing macOS support from our most popular wired network adapters (USB3-E1000 and USBC-E1000) in October 2019. We saw the continued potential for a poor or broken user experience with ASIX-based adapters on macOS and could not in good conscience market the adapters as fully compatible in the long-term as long as ASIX was unwilling to commit to continued development and support of their ICs on macOS.

We have continued to push ASIX for a DEXT beta driver to validate and test internally in the past year. Unfortunately, ASIX has been unable to deliver this solution as requested in anticipation of this significant macOS milestone. We expect a Beta driver from ASIX by the end of November for AX88179 products like the USB3-E1000 and USBC-E1000. Once the driver is validated, we will update this blog post and product driver pages with links to download the driver.

If a wired Ethernet connection is critical to your workflow, Plugable recommends not updating to macOS 11 Big Sur from macOS 10.15 Catalina.

At this time, Plugable is unable to provide a DEXT driver for the following products:
USB3-E1000 IC: AX88179
USBC-E1000 IC: AX88179
USB2-E1000 IC: AX88178 (ASIX has discontinued the IC in this product, and they have not committed to a compatible driver for macOS 11 Big Sur)
The USB2-E100 IC: AX88772 ASIX-based product continues to function, utilizing the in-box drivers in macOS.

We understand this news can be frustrating for our customers and is a situation we have been working to avoid for over one year. We will update this blog post as new information is available to us.

While we cannot promise a functional DEXT driver at any point in the future, if you would like to be notified of that news should it occur, please sign-up on the form below, and we will email everyone as soon as it is available.

继续阅读AX88179 USB网卡无法在macOS Big Sur(11.0.1)系统上正常使用

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