Erle Robotics Python Networking Gitbook Free
Introduction
1. Introduction to Client/Server Networking
- 1.1. Virtualenv
- 1.2. Installing virtualenv in Erle
- 1.3. Create a virtual environment to test packages
2. Introduction to socket
- 2.1. What is socket?
- 2.2. Creating a Socket
- 2.3. Using sockets
- 2.4. Disconnecting
- 2.5. Non - blocking sockets
3. UDP and TCP
- 3.1. Addresses and port numbers
- 3.2. UDP
- 3.3. TCP
4. Socket names and DNS
- 4.1. Socket names
- 4.2. Five socket cordinates
- 4.3. IPv6
- 4.4. The getaddrinfo() function
- 4.5. A Sketch of How DNS Works
- 4.6. Using DNS
5. Network Data and Network Errors
- 5.1. Text and Encodings
- 5.2. Network Byte Order
- 5.3. Framing and Quoting
- 5.4. Pickles and Self-Delimiting Formats
- 5.5. XML, JSON, Etc.
- 5.6. Compression
- 5.7. Network Exceptions
- 5.8. Handling Exceptions
6. TLS and SSL
- 6.1. Cleartext on the Network
- 6.2. TLS Encrypts Your Conversations
- 6.3. Supporting TLS in Python
- 6.4. The Standard SSL Module
7. Server Architecture
- 7.1. Daemons and Logging
- 7.2. Introductory example
- 7.3. Elementary client
- 7.4. Event-Driven Servers
- 7.5. The Semantics of Non-blocking
- 7.6. Twisted Python
- 7.7. Threading and Multi-processing
- 7.8. Threading and Multi-processing Frameworks
8. Caches, Message Queues, and Map-Reduce
- 8.1. Using Memcached
- 8.2. Memcached and Sharding
- 8.3. Message Queues
- 8.4. Using Message Queues from Python
- 8.5. Map-Reduce
9. HTTP
- 9.1. URL Anatomy
- 9.2. Relative URLs
- 9.3. Instrumenting urllib2
- 9.4. The GET Method and The Host Header
- 9.5. Payloads and Persistent Connections
- 9.6. POST And Forms
- 9.7. REST And More HTTP Methods
- 9.8. Identifying User Agents and Web Servers
- 9.9. Content Type Negotiation
- 9.10. Compression
- 9.11. HTTP Caching
- 9.12. The HEAD Method
- 9.13. HTTPS Encryption
- 9.14. HTTP Authentication
- 9.15. Cookies
- 9.16. HTTP Session Hijacking
- 9.17. Cross-Site Scripting Attacks
10. Screen Scraping
- 10.1. Fetching Web Pages
- 10.2. Downloading Pages Through Form Submission
- 10.3. The Structure of Web Pages
- 10.4. Three Axes
- 10.5. Diving into an HTML Document
- 10.6. Selectors
11. Web Applications
- 11.1. Web Servers and Python
- 11.2. Choosing a Web Server
- 11.3. WSGI
- 11.4. WSGI Middleware
- 11.5. Python Web Frameworks
- 11.6. URL Dispatch Techniques
- 11.7. Templates
- 11.8. Pure-Python Web Servers
- 11.9. Common Gateway Interface (CGI)
- 11.10. mod_python
12. E-mail Composition and Decoding
- 12.1. E-mail Messages
- 12.2. Composing Traditional Messages
- 12.3. Parsing Traditional Messages
- 12.4. Parsing Dates
- 12.5. Understanding MIME
- 12.6. Composing MIME Attachments
- 12.7. MIME Alternative Parts
- 12.8. Composing Non-English Headers
- 12.9. Composing Nested Multiparts
- 12.10. Parsing MIME Messages
- 12.11. Decoding Headers
13. Simple Mail Transport Protocol (SMTP)
- 13.1. E-mail Clients, Webmail Services
- 13.2. How SMTP Is Used
- 13.3. Sending E-Mail
- 13.4. Introducing the SMTP Library
- 13.5. Error Handling and Conversation Debugging
- 13.6. Getting Information from EHLO
- 13.7. Using Secure Sockets Layer and Transport Layer Security
- 13.8. Authenticated SMTP
14. Post Office Protocol (POP)
- 14.1. Connecting and Authenticating
- 14.2. Obtaining Mailbox Information
- 14.3. Downloading and Deleting Messages
15. Internet Message Access Protocol (IMAP)
- 15.1. Understanding IMAP in Python
- 15.2. IMAPClient
- 15.3. Message Numbers vs. UIDs
- 15.4. Summary Information
- 15.5. Downloading an Entire Mailbox
- 15.6. Downloading Messages Individually
- 15.7. Flagging and Deleting Messages
- 15.8. Searching and Manipulating Messages
16. Telnet and SSH
- 16.1. Command-Line Automation
- 16.2. Command-Line Expansion and Quoting
- 16.3. Unix Has No Special Characters
- 16.4. Quoting Characters for Protection
- 16.5. Things Are Different in a Terminal
- 16.6. Terminals Do Buffering
- 16.7. Telnet
- 16.8. SSH: The Secure Shell
- 16.9. SSH Host Keys
- 16.10. SSH Authentication
- 16.11. Shell Sessions and Individual Commands
- 16.12. SFTP: File Transfer Over SSH
17. File Transfer Protocol (FTP)
- 17.1. What to Use Instead of FTP
- 17.2. Communication Channels
- 17.3. Using FTP in Python
- 17.4. ASCII and Binary Files
- 17.5. Advanced Binary Downloading
- 17.6. Uploading Data
- 17.7. Advanced Binary Uploading
- 17.8. Handling Errors
- 17.9. Detecting Directories and Recursive Download
- 17.10. Creating Directories, Deleting Things
18. Remote Procedure Call (RPC)
- 18.1. Features of RPC
- 18.2. XML-RPC
- 18.3. JSON-RPC
- 18.4. Self-documenting Data
- 18.5. Talking About Objects: Pyro and RPyC
- 18.6. An RPyC Example
- 18.7. RPC, Web Frameworks, Message Queues

Erle Robotics Python Networking Gitbook Free

When to use UPD

So, The User Data Protocol, UDP, lets user-level programs send individual packets across an IP network. Typically, a client program sends a packet to a server, which then replies back using the return address built into every UDP packet. You might think that UDP would be very efficient for sending small messages. Actually, UDP is efficient only if your host ever only sends one message at a time, then waits for a response.

There are two good reasons to use UDP:

Because you are implementing a protocol that already exists, and it uses UDP.

Because unreliable subnet broadcast is a great pattern for your application, and UDP supports it perfectly.