lwIP TCP/IP Stack

Lightweight IP Protocol Implementation

Overview

lwIP is a lightweight open-source TCP/IP stack designed for embedded systems. AOS integrates lwIP for full TCP/IP networking support.

Supported Protocols

IPv4 - Internet Protocol version 4
TCP - Transmission Control Protocol (reliable streams)
UDP - User Datagram Protocol (fast datagrams)
ARP - Address Resolution Protocol
DHCP - Dynamic Host Configuration Protocol
DNS - Domain Name System resolution
ICMP - Internet Control Message Protocol (ping)

lwIP Integration

✓ Kernel modes configuration (lwipopts.h)
✓ Thread-safe netif integration
✓ Custom memory pools for efficiency
✓ Interrupt-safe packet handling
✓ Error handling and logging

Key Takeaways

✓ Full TCP/IP stack in compact form
✓ Multiple protocol support
✓ DHCP automatic configuration
✓ DNS name resolution
✓ Low memory footprint