lib60870-C  2.3.2
C source code library for the IEC 60870-5-101/104 protocols
README lib60870-C

lib60870 library for IEC 60870-5 based protocols in C

The current implementation contains code for the IEC 60870-5-101 (application layer and serial link layer) and IEC 60870-5-104 (protocool over TCP/IP) specifications.


  • support for all application layer message types
  • master and slave
  • balanced and unbalanced link layers (for CS 101 serial communication)
  • client/server for CS 104 TCP/IP communication
  • CS 104 redundancy group support
  • CS101 slave/CS104 server: file service support
  • Supports most TLS features required by IEC 62351-3 (third party code mbedtls required)
  • portable C99 code

Please also consider the User Guide and the API reference documentation (

Compiling and running the examples:

In the lib60870-C folder build the library with


Go to the examples folder and build the examples with


in each examples' directory.

The library and examples can also be build with CMake.

To build the library in a separate folder create a new folder as subdirectory of the project folder and run cmake to create the build files:

mkdir build

cd build

cmake ..

Building without common code and HAL

The library contains some common code and a platform abstraction layer (HAL) that is shared with other protocol libraries of MZ Automation (e.g. libiec61850). In order to simplify using these protocol libraries together it is possible to compile the library without the common parts.

This can be done by using the WITHOUT_HAL and WITHOUT_COMMON defines when calling make:


Building with TLS support

The library can be build with support for TLS. In order to do so you have to download mbedtls version 2.28.x.

Unpack the mbedtls tarball in the dependencies folder so that a folder



The cmake build system will automatically detect the mbedtls source and build the library with TLS support and mbedtls included

When using make you have to call make with WITH_MBEDTLS=1


Library configuration

There are different runtime and compile-time configuration options.

Compile time configuration options can be used to shrink down the library for small embedded systems. Compile time configuration can be changed by modifying the file config/lib60870_config.h.

Memory allocation

The library uses dynamic memory allocation (malloc/calloc wrapped by own functions that can be replaced when required).

The CS104 slave uses dynamic memory allocation only at setup time (when calling the function CS104_Slave_create and CS104_Slave_start/_CS104_Slave_startThreadless_.

For details please have a look at the User Guide.


The library is developed by Michael Zillgith and supported by MZ Automation GmbH.

For bug reports, hints or support please contact


This software can be dual licensed under the GPLv3 ( and a commercial license agreement.

When using the library in commercial and non-GPL applications you should buy a commercial license.

Commercial licenses and support

Support and commercial license options are provided by MZ Automation GmbH. Please contact for more details.


If you want to contribute to the improvement and development of the library please send me comments, feature requests, bug reports, or patches.

For more than trivial contributions I require you to sign a Contributor License Agreement. Please contact