### Configure Fledge IEC104 Plugin Build with CMake Options

Source: https://github.com/fledge-iot/fledge-south-iec104/blob/develop/README.rst

These examples demonstrate various ways to configure the Fledge IEC104 plugin build using CMake, including default behavior, setting `FLEDGE_ROOT`, and overriding paths for source, includes, libraries, and installation.

```console
$ cmake ..

$ export FLEDGE_ROOT=/some_fledge_setup

$ cmake ..

$ cmake -DFLEDGE_SRC=/home/source/develop/Fledge  ..

$ cmake -DFLEDGE_INCLUDE=/dev-package/include ..

$ cmake -DFLEDGE_LIB=/home/dev/package/lib ..

$ cmake -DFLEDGE_INSTALL=/home/source/develop/Fledge ..

$ cmake -DFLEDGE_INSTALL=/usr/local/fledge ..
```

--------------------------------

### Set Build Version and Install Plugin Library

Source: https://github.com/fledge-iot/fledge-south-iec104/blob/develop/CMakeLists.txt

Sets the SOVERSION property for the shared library to 1. It then defines the installation target for the plugin. If the `FLEDGE_INSTALL` variable is set, the compiled shared library is installed to the specified Fledge plugin directory.

```CMake
set_target_properties(${PROJECT_NAME} PROPERTIES SOVERSION 1)

set(FLEDGE_INSTALL "" CACHE INTERNAL "")
if (FLEDGE_INSTALL)
	message(STATUS "Installing ${PROJECT_NAME} in ${FLEDGE_INSTALL}/plugins/${PLUGIN_TYPE}/${PROJECT_NAME}")
	install(TARGETS ${PROJECT_NAME} DESTINATION ${FLEDGE_INSTALL}/plugins/${PLUGIN_TYPE}/${PROJECT_NAME})
endif()
```

--------------------------------

### Clone and Prepare lib60870 Source

Source: https://github.com/fledge-iot/fledge-south-iec104/blob/develop/README.rst

This sequence of commands clones the lib60870 repository from GitHub and sets an environment variable `LIB_104` to its current working directory, which is required for subsequent build steps.

```console
$ git clone https://github.com/mz-automation/lib60870.git
$ cd lib60870
$ export LIB_104=`pwd`
```

--------------------------------

### Build lib60870 Library

Source: https://github.com/fledge-iot/fledge-south-iec104/blob/develop/README.rst

These commands navigate into the `lib60970-C` directory, create a build directory, configure the project using CMake, and then compile the lib60870 library using Make.

```console
$ cd lib60970-C
$ mkdir build
$ cd build
$ cmake ..
$ make
```

--------------------------------

### Build Fledge IEC104 South Plugin

Source: https://github.com/fledge-iot/fledge-south-iec104/blob/develop/README.rst

This sequence of commands creates a build directory within the plugin's source tree, configures the project using CMake, and then compiles the Fledge IEC104 South plugin using Make.

```console
$ mkdir build
$ cd build
$ cmake ..
$ make
```

--------------------------------

### Configure Include and Link Directories

Source: https://github.com/fledge-iot/fledge-south-iec104/blob/develop/CMakeLists.txt

Adds various include directories necessary for compilation, including the plugin's own headers, Fledge's headers, and `lib60870`'s headers. It also adds Fledge's library link directories and conditionally includes RapidJSON if `FLEDGE_SRC` is defined.

```CMake
include_directories(include)
include_directories(${FLEDGE_INCLUDE_DIRS})
include_directories(${LIB60870}/src/hal/inc)

link_directories(${FLEDGE_LIB_DIRS})

if (FLEDGE_SRC)
	message(STATUS "Using third-party includes " ${FLEDGE_SRC}/C/thirdparty)
	include_directories(${FLEDGE_SRC}/C/thirdparty/rapidjson/include)
endif()
```

--------------------------------

### Create Shared Library and Link Dependencies

Source: https://github.com/fledge-iot/fledge-south-iec104/blob/develop/CMakeLists.txt

Creates the shared library for the plugin using all discovered source files and the generated version header. It then links all necessary Fledge libraries, `lib60870`, and other system libraries like `pthread` and `dl` required for the plugin's runtime.

```CMake
add_library(${PROJECT_NAME} SHARED ${SOURCES} version.h)

target_link_libraries(${PROJECT_NAME} ${NEEDED_FLEDGE_LIBS})

target_link_libraries(${PROJECT_NAME} -L/usr/local/lib -llib60870)

target_link_libraries(${PROJECT_NAME} -lpthread -ldl)
```

--------------------------------

### Discover Source Files and Set lib60870 Path

Source: https://github.com/fledge-iot/fledge-south-iec104/blob/develop/CMakeLists.txt

Uses `file(GLOB)` to find all C++ source files (`.cpp`) in the current directory. It also sets the path to the `lib60870-C` library, typically located in the user's home directory.

```CMake
file(GLOB SOURCES *.cpp)

set(LIB60870 "$ENV{HOME}/lib60870/lib60870-C")
```

--------------------------------

### Add Fledge IEC104 Service via cURL

Source: https://github.com/fledge-iot/fledge-south-iec104/blob/develop/README.rst

This cURL command demonstrates how to add a new IEC104 south service to Fledge using its web API, specifying the service name, type, plugin, and enabling it.

```console
$ curl -sX POST http://localhost:8081/fledge/service -d '{"name":"iec104_name","type":"south","plugin":"iec104","enabled":true}'
```

--------------------------------

### Generate Version Header File

Source: https://github.com/fledge-iot/fledge-south-iec104/blob/develop/CMakeLists.txt

Defines a custom build command to generate the `version.h` header file. This file is created from a `VERSION` file using a `mkversion` script, ensuring that the plugin's build includes dynamic version information.

```CMake
set_source_files_properties(version.h PROPERTIES GENERATED TRUE)
add_custom_command(
  OUTPUT version.h
  DEPENDS ${CMAKE_SOURCE_DIR}/VERSION
  COMMAND ${CMAKE_SOURCE_DIR}/mkversion ${CMAKE_SOURCE_DIR}
  COMMENT "Generating version header"
  VERBATIM
)
include_directories(${CMAKE_BINARY_DIR})
```

--------------------------------

### Configure CMake Project and C++ Compiler Flags

Source: https://github.com/fledge-iot/fledge-south-iec104/blob/develop/CMakeLists.txt

Sets the minimum required CMake version, defines the project name for the IEC104 plugin, and configures C++11 standard with O3 optimization for all C++ compilations.

```CMake
cmake_minimum_required(VERSION 2.8)

project(iec104)

set(CMAKE_CXX_FLAGS "-std=c++11 -O3")
```

--------------------------------

### Define Fledge Plugin Type and Core Dependencies

Source: https://github.com/fledge-iot/fledge-south-iec104/blob/develop/CMakeLists.txt

Specifies the type of the Fledge plugin as 'south' and lists the essential Fledge libraries, such as 'common-lib', that are required for this plugin to function correctly.

```CMake
set(PLUGIN_TYPE "south")
set(NEEDED_FLEDGE_LIBS common-lib)
```

--------------------------------

### Locate Fledge Package and Handle Build Errors

Source: https://github.com/fledge-iot/fledge-south-iec104/blob/develop/CMakeLists.txt

Configures CMake to find the Fledge package. If Fledge is not found, it attempts to clean up any existing build artifacts (like `Makefile`) and then terminates the build process with a fatal error message, ensuring a clean state for subsequent attempts.

```CMake
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR})
find_package(Fledge)
if (NOT FLEDGE_FOUND)
	if (EXISTS "${CMAKE_BINARY_DIR}/Makefile")
		execute_process(COMMAND make clean WORKING_DIRECTORY ${CMAKE_BINARY_DIR})
		file(REMOVE "${CMAKE_BINARY_DIR}/Makefile")
	endif()
	message(FATAL_ERROR "Fledge plugin '${PROJECT_NAME}' build error.")
endif()
```

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