Segger develops and distributes software development tools and ANSI C software components for embedded systems. Main products are : emWin, an universal graphics software (GUI) for embedded applications; embOS, a small real-time kernel; emFile, an embedded file system; USB stacks; and J-Link, the JTAG emulator for ARM cores. Segger cuts software development time for embedded applications by offering compact, flexible and easy-to-use middleware.



  • Standard sockets interface.
  • High performance.
  • Small footprint.
  • Runs “out-of-the-box”.
  • No configuration required.
  • Works with any RTOS in a multitasking environment (embOS recommended).
  • Zero-copy for ultra-fast performance.
  • Drivers for most popular microcontrollers and external MACs available.
  • Easy to use!.
  • Raw socket support
  • Non-blocking versions of all functions.
  • Unlimited Connections.
  • Re-assembly of fragmented packets.
  • Fully runtime configurable.
  • Developed from ground up for embedded systems.
  • PPP/PPPoE available.
  • Various upper layer protocols available.
  • Royalty-free.
Easy to use

The stack comes with a variety of confidence tests and example applications. It runs out of the box. For most microcontrollers, sample projects are available. All modules can output debug messages and warnings in debug builds. The modules to output this information can be selected at run-time, allowing the developer to focus on the aspect he is analyzing.

Configuration free

The entire stack can be compiled into a library. Setup is reduced to a minimum, performed at run-time. This, along with a wealth of sample programs, gets you up and running quickly. Since inter-module dependencies are limited to the parts required for the functionality of the stack, unused parts of the code are automatically excluded by the linker.


embOS/IP is written in ANSI C and, apart from the Link-Layer-Driver, hardware-independent.


The stack has been optimized for both, performance and code size. The standard socket interface is complemented by the zero-copy API, which allows reading and writing of data without additional protocol buffers, if the target hardware and driver support DMA.

Multi-task support

embOS/IP allows any number of tasks to call API functions concurrently. The stack itself uses typically two tasks (one for housekeeping and one for packet reception), but can also be used with just a single or even no task (polled mode). The two-task model allows minimum interrupt latency on systems without nested interrupts.

embOS/IP structure

embOS/IP is organized in different layers: Application Layer DHCP, DNS, FTP, HTTP, Telnet Transport Layer TCP, UDP Network Layer IPv6, IPv4, ICMP, ARP, RARP, … Link Layer Ethernet (IEEE 802.3), PPP, …

embOS/IP Software Products

embOS/IP is offered in a BASE package which includes the most important protocols related to Ethernet communication and the stack itself. Depending on the engineer’s needs there are several protocols available as add-ons, as well as the embOS/IP PRO software which includes a device driver, and all addons for extended communication via Internet. The following protocols are part of the basic package:

  • ARP (Address resolution protocol)
  • IP (Internet protocol)
  • ICMP (Internet control message protocol)
  • UDP (User datagram protocol)
  • TCP (Transmission control protocol)
  • Standard Socket API
  • Zero-Copy API
  • DNS client
  • DHCP client
  • Telnet server (sample)

You can find the full list of additional modules here:

Optional Products


The embOS/IP web server allows embedded systems to present web pages with dynamically generated content. It has all features typically required by embedded systems: multiple connections, authentication, forms. The RAM usage of the web server has been kept to a minimum by smart buffer handling. The sockets interface can be used with any TCP/IP stack.


The embOS/IP FTP server can use the same file system as the web server. It can be used in r/o or in r/w mode and allows reading and modifying of configuration data or web content. With the FTP client add-on data can be exchanged with any FTP server .

emSSL Transport Layer

emSSL is a Transport Layer Security solution which allows secure and private connections with single-chip systems using as little as 7 kBytes of RAM. emSSL works perfectly with embOS/IP. For more details about emSSL, please refer to the product description on page 18.

Available Add-ons


As an alternative to Ethernet PPP allows the use of IP via modem or GSM. Further add-ons are available.


Universal Plug&Play module.

embOS/IP SNTP Client

Simple Network Time Protocol.

embOS/IP SMTP Client

The Client allows to send emails from your embedded system via an email server.

Memory requirements

Memory requirements depend on the used CPU, compiler, memory model, as well as on various other factors. A typical ROM size for a system using ARP, IP, ICMP, UDP, TCP and sockets is about 18kB (on typical 32-bit microcontroller with size optimization). Minimum RAM usage is about 6KB for simple applications.

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