upgrade CryptoSwift (1.4.0) to CryptoSwift (1.4.1)
rm -rf Pods and Podfile.lock files then execute 'pod install'

set EXCLUDED_ARCHS[sdk=iphonesimulator*]=arm64 i386 in your build settings

Issued by: Apple Worldwide Developer Relations Certification Authority[]
downlaod new root ca
wget https://www.apple.com/certificateauthority/AppleWWDRCAG3.cer
add ca to trust keychain
sudo security add-trusted-cert -d -r trustRoot -k /Library/Keychains/System.keychain AppleWWDRCAG3.cer

rm -rf flutter/bin/cache

## keras to tensorflow.python.keras
replace: from keras.utils import generic_utils
with: from tensorflow.python.keras.utils import generic_utils

## keras.applications to tensorflow.keras.applications
from keras.preprocessing.image import load_img
from keras.preprocessing.image import img_to_array
from keras.applications.vgg16 import preprocess_input
from keras.applications.vgg16 import decode_predictions
from keras.applications.vgg16 import VGG16
became this:
from tensorflow.keras.preprocessing.image import load_img
from tensorflow.keras.preprocessing.image import img_to_array
from tensorflow.keras.applications.vgg16 import preprocess_input
from tensorflow.keras.applications.vgg16 import decode_predictions
from tensorflow.keras.applications.vgg16 import VGG16

#mysql
interactive_timeout for configuring this behavior.
SHOW SESSION VARIABLES LIKE '%timeout%';
#config
sudo vim /etc/mysql/mysql.conf.d/mysqld.cnf
wait_timeout = 2880000
interactive_timeout = 2880000
sudo service mysql restart

###modparam("tls_mgm","tls_method", "[default]TLSv1")

It is time to update default certs digest algorithm from SHA1 to SHA256 now.

rocommunity public  localhost
#rocommunity public  default    -V systemonly
#rocommunity6 public  default   -V systemonly

service snmpd restart
#trafic
snmpwalk -v 2c -c public  localhost 1.3.6.1.2.1.31.1.1.1
#in_trafic
snmpwalk -v 2c -c public  localhost 1.3.6.1.2.1.31.1.1.1.6.2
#out_trafic
snmpwalk -v 2c -c public  localhost 1.3.6.1.2.1.31.1.1.1.10.2

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"

# 1.执行安装脚本
export HOMEBREW_BREW_GIT_REMOTE="https://mirrors.ustc.edu.cn/brew.git"
export HOMEBREW_CORE_GIT_REMOTE="https://mirrors.ustc.edu.cn/homebrew-core.git"
/bin/bash -c "$(curl -fsSL https://cdn.jsdelivr.net/gh/ineo6/homebrew-install/install.sh)"
# 2.安装完成后设置
echo 'export HOMEBREW_BOTTLE_DOMAIN=https://mirrors.ustc.edu.cn/homebrew-bottles/bottles/' >> ~/.bash_profile
source ~/~/.bash_profile

cd $(brew --repo); git fetch; git reset --hard origin/master
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"; git pull https://github.com/Homebrew/homebrew-core
cd "$(brew --repo)/Library/Taps/homebrew/homebrew-cask"; git pull https://github.com/Homebrew/homebrew-cask

brew update-reset