yum update
curl -fsSL https://get.docker.com/ | sh
systemctl enable docker
systemctl start docker

docker run hello-world

Arduino UNO

VCC -   3.3V
GND -    GND
SCK - Pin 13
SO  - Pin 12
SI  - Pin 11
CS  - Pin 10

Arduino MEGA

VCC -   3.3V
GND -    GND
SCK - Pin 52
SO  - Pin 50
SI  - Pin 51
CS  - Pin 53

之前使用 Yosemite 的时候，使用 CH341 的串口驱动是需要打开 kext 的调试模式的，有点麻烦但更令人感到些许不安：

sudo nvram boot-args="kext-dev-mode=1"

这次升级 EI Capitan 后，把 kext-dev-mode 给关闭掉了，没想到 CH341 的串口驱动也可以直接使用，看来已经认证过了。

$ nvram -p
......
boot-args	kext-dev-mode=0
......

驱动下载地址：http://www.wch.cn/download/CH341SER_MAC_ZIP.html

使用 brew 安装稳定版的 composer 版本是 1.2.0 的，可是一运行 composer 就提示：

PHP Fatal error:  Uncaught PharException: phar "/Users/wwx/Developer/Cellar/composer/1.2.0/libexec/composer.phar" SHA1 signature could not be verified: broken signature in /Users/wwx/Developer/Cellar/composer/1.2.0/libexec/composer.phar:23
Stack trace:
#0 /Users/wwx/Developer/Cellar/composer/1.2.0/libexec/composer.phar(23): Phar::mapPhar('composer.phar')
#1 {main}
  thrown in /Users/wwx/Developer/Cellar/composer/1.2.0/libexec/composer.phar on line 23

Fatal error: Uncaught PharException: phar "/Users/wwx/Developer/Cellar/composer/1.2.0/libexec/composer.phar" SHA1 signature could not be verified: broken signature in /Users/wwx/Developer/Cellar/composer/1.2.0/libexec/composer.phar on line 23

PharException: phar "/Users/wwx/Developer/Cellar/composer/1.2.0/libexec/composer.phar" SHA1 signature could not be verified: broken signature in /Users/wwx/Developer/Cellar/composer/1.2.0/libexec/composer.phar on line 23

Call Stack:
    0.0063     359032   1. {main}() /Users/wwx/Developer/Cellar/composer/1.2.0/libexec/composer.phar:0
    0.0064     359032   2. Phar::mapPhar() /Users/wwx/Developer/Cellar/composer/1.2.0/libexec/composer.phar:23

就想直接安装 master 版看看，搜了一下 homebrew 还真有真有这个参数，安装后 composer 就又可以正常运行了。

brew install composer --HEAD

纯 Demo Web Server，一切 Web 请求均返回 HelloWorld 作为响应

<?php
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_bind($socket, "0.0.0.0", 9501);
socket_listen($socket, 5);
for(;;) {
    $client = socket_accept($socket);
    $buffer = socket_read($client, 2048);
 
    socket_write($client, "HTTP/1.1 200 OK\r\n");
    socket_write($client, "Transfer-Encoding: chunked\r\n");
    socket_write($client, "\r\n");
    socket_write($client, "HelloWorld\r\n");
    socket_close($client);
}
socket_close($socket);

代码功能：在本地开一个 TCP 9501 端口，等待客户端连接，客户端连接上来之后，向客户端发送一个 HelloWorld，然后关闭这个连接，等待下一个客户端的连接。

<?php
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_bind($socket, "0.0.0.0", 9501);
socket_listen($socket, 5);
for(;;) {
    $client = socket_accept($socket);
    socket_write($client, "HelloWorld\n");
    socket_close($client);
}
socket_close($socket);

纯 Demo 代码，和当年 XMLHttpRequest 似的，裸调 WebSocket：

var socket = new WebSocket('ws://localhost:9501');
socket.onopen = function(event) {
    socket.send('HelloWorld!');
    socket.onmessage = function(event) {
        console.log('Client received a message', event);
    };
    socket.onclose = function(event) {
        console.log('Client notified socket has closed', event);
    };
    //socket.close();
};

今天在 ubuntu 机器上执行：sudo apt-get update 的时候，提示错误如下：

.......
Fetched 3,192 B in 3s (848 B/s)
Reading package lists... Done
W: GPG error: http://archive.ubuntukylin.com:10006 xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8D5A09DC9B929006

看上去是某个公钥找不到，解决方法就是导入这个公钥

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 8D5A09DC9B929006

原先生成的私钥是带密码保护的，现在 git 提交代码的时候不想那么麻烦总输入密码了，就需要把那个密码移除掉，具体命令：

ssh-keygen -f ~/.ssh/id_dsa -p

提示你输入新密码的时候，直接回车就可以了，或者使用 openssl 来生成一个新的

openssl rsa -in ~/.ssh/id_rsa -out ~/.ssh/id_rsa_new

在 Laraevl 中偶尔需要在命令行直接灌点测试数据进去，结果却被提示：

Illuminate\Database\Eloquent\MassAssignmentException with message 'key'

应该是 key 字段无法直接 create 导致的，可临时禁用掉 MassAssignment 功能以解决这个问题

Eloquent::unguard();