Beaglebone black ——Python 之《beagleBone Home Automation》之二 Socket 实验

从这里开始脱离低级趣味

In this chapter, we will leave lower-level electronics aside for a moment, and start
talking a little bit about network programming. Since our target is basically a
headless system (in this case, a system with no direct output device), we will need
some way of interfacing with it.

creating a platform-independent remote access

创建无关平台的远程访问过程

关键问题：

1、TCP/IP socket

2、创建一个用于检索页面的socket应用

3、实现服务器和客户端应用程序，可以通过TCP / IP套接字进行通信。

套接字科普：

您可以将套接字视为双向通信管道。套接字是两种软件模块之间的主要通信方式，尤其在一个网络上。

在操作系统层面上，还有其他更有效的方法，比如：进程间的通信(进程间通信)。

但当通信需要在不同的机器之间建立，甚至可能不同的平台，套接字几乎是唯一的选择。

Sockets can be divided into two parts, a client socket and a server socket. The main
differences are as follows:

套接字实验

1、添加套接字相关库

import socket #For access to socket communication
import sys #To terminate with error code

2、创建INET流套接字

client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

参数一：AF_INET协议参数二:socket.sock_stream 是socket类型

3、IP地址连接WEB服务器，使用gethostbyname（）方法、解析IP地址如下代码：

host = "www.beagleboard.org" #The address we will connect to
port = 80 #The default port for web-server
print "Connecting to %s" % host

# Use socket library to retrieve ip address for www.beagleboard.org
try:
target_ip = socket.gethostbyname( host )

4、连接sever

client_socket.connect((target_ip , 80))

5、向服务器发送消息

# Send a simple HTTP-GET message
msg = "GET / HTTP/1.0\r\n\r\n"
client_socket.sendall(msg)
except Exception, err:
print "Socket connection has failed:"
print err
sys.exit(2)

6、读取服务器返回的reply

# Ask the socket to retrieve the first 1024 bytes
reply = client_socket.recv(1024)
print reply
client_socket.close() # Close the socket afterwards

成功！

Beaglebone black ——Python 之 《beagleBone Home Automation》 之二 Socket 实验

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Beaglebone black ——Python 之《beagleBone Home Automation》之二 Socket 实验