.

README.md

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+## Abstract
+It serves as a kind of bridge between server to other-clients.
+connection with OPCUA server( https://github.com/FactoryThing/opcua_sensor_server ) and gathering data, send data using MQTT or TCP 
+
+
+## Using open62541
+A general introduction to OPC UA and the open62541 documentation can be found at http://open62541.org/doc/current.
+Past releases of the library can be downloaded at https://github.com/open62541/open62541/releases.
+To use the latest improvements, download a nightly build of the *single-file distribution* (the entire library merged into a single source and header file) from http://open62541.org/releases. 
+Nightly builds of MSVC binaries of the library are available [here](https://ci.appveyor.com/project/open62541/open62541/build/artifacts).
+## Using json-c
+JSON-C implements a reference counting object model that allows you to easily construct JSON objects in C, output them as JSON formatted strings and parse JSON formatted strings back into the C representation of JSON objects. It aims to conform to RFC 7159.
+## Using paho.mqtt.embedded-c
+The Paho embedded client libraries arose out of the desire to allow the smallest microcontrollers to easily connect to MQTT servers.
+
+## Implementation
+### Pre-condition
+- mqtt : install ( https://mosquitto.org/  |  mosquitto broker/ client)
+- json-c : build ( included )
+- paho.mqtt.embedded-c : build ( included )
+
+
+1) need to modify the path ( /home/mint/ )
+- open62541_mqtt/mqtt/CMakeLists.txt  need  modify
+
+    - EX) set(EXTER_MQTT_ROOT "/home/mint/paho.mqtt.embedded-c" CACHE STRING "MQTT paho header and library root path")
+    - EX) set(EXTER_JSON_ROOT "/home/mint/json-c" CACHE STRING "JSON header and library root path")
+
+2) build
+    - mkdir build
+    - cd build
+    - cmake .. -DUA_ENABLE_SUBSCRIPTIONS=true -DUA_ENABLE_METHODCALLS=true -DUA_ENABLE_NODEMANAGEMENT=true -DUA_ENABLE_NONSTANDARD_MQTT=true
+    - make ( created bin folder : config.json, libopen62541.a, opcua-mqtt-bridge)
+
+
+3) config.json modify
+- open62541_mqtt/build/bin
+```c
+//EXAMPLE
+    {
+    "device-configuration": {
+        "Device": {
+            "deviceID": "sensor0"
+        }
+    },
+    "server-configuration": {
+        "opcuaServer": {
+            "EndpointURL": "opc.tcp://localhost:16664",
+            "publishIntervalUs":1000000,
+            "asycRequestSupported": false,
+            "method": "poll"
+        },
+        "mqttBrocker": {
+            "enable": true,
+            "ip" : "192.168.0.197",
+            "port": 1883,
+            "topicBase": "topic"
+        },
+        "tcpSever": {
+            "enable": false,
+            "ip": "192.168.2.104",
+            "port": 5555,
+            "sampleIntervalUs": 100,
+            "singleshot": true /* at now : should be true */
+        }
+    },
+
+    // 1usec = 1
+    // 1msec = 1000
+    // 1sec = 1000000
+    // 1min = 60000000
+
+    "node-map": [
+        {
+           "name": "test",
+           "enable": true,
+           "method": "poll",
+           "intervalUSec": 1000000,
+           "topic": "test_opcua",
+           "mqtt": true,
+           "format": "json",
+           "nodes": [
+        { "id": "ns=1;s=sound_data", "topic":"sound", "alias": "" },
+        { "id": "ns=1;s=temp_data", "topic": "temp", "alias": "" },
+        { "id": "ns=1;s=tilt_data", "topic": "tilt", "alias": "" }
+            ]
+        }
+    ]
+}
+```
+4) run
+    -  ./opcua-mqtt-bridge --config config.json

json-c/.editorconfig

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+# EditorConfig
+# http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# LF end-of-line, insert an empty new line and UTF-8
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+
+# Tab indentation
+[makefile,Makefile]
+indent_style = tab

json-c/.gitignore

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+# Temp files
+*~
+*.swp
+*.bak
+*.backup
+\#*
+.\#*
+*\#
+*.sav
+*.save
+*.autosav
+*.autosave
+
+# Tests
+/test-driver
+/tests/Makefile
+/tests/Makefile.in
+/tests/test1
+/tests/test1Formatted
+/tests/test2
+/tests/test2Formatted
+/tests/test4
+/tests/testReplaceExisting
+/tests/testSubDir
+/tests/test_cast
+/tests/test_charcase
+/tests/test_compare
+/tests/test_deep_copy
+/tests/test_double_serializer
+/tests/test_float
+/tests/test_int_add
+/tests/test_json_pointer
+/tests/test_locale
+/tests/test_null
+/tests/test_parse
+/tests/test_parse_int64
+/tests/test_printbuf
+/tests/test_set_serializer
+/tests/test_set_value
+/tests/test_util_file
+/tests/test_visit
+/tests/*.vg.out
+/tests/*.log
+/tests/*.trs
+
+# Generated folders
+/Debug
+/Release
+/*/Debug
+/*/Release
+
+# Generated binaries
+*.lo
+*.o
+/libjson-c.la
+/libjson.la
+
+# Archives
+*.zip
+*.tar.*
+*.tgz
+*.gz
+*.bz2
+*.xz
+*.lz
+*.lzma
+*.7z
+*.dll
+*.deb
+*.rpm
+*.apk
+*.exe
+*.msi
+*.dmg
+*.ipa
+
+.deps/
+.libs/
+/aclocal.m4
+/autoconf-archive
+/autom4te.cache
+/config.guess
+/config.h.in
+/json_config.h
+/compile
+/config.h
+/config.log
+/config.status
+/config.sub
+/configure
+/depcomp
+/doc
+/install-sh
+/json.pc
+/json-c.pc
+/json-c-uninstalled.pc
+/libtool
+/ltmain.sh
+/Makefile
+/Makefile.in
+/missing
+/stamp-h1
+/stamp-h2
+
+# cmake auto-generated files
+/CMakeCache.txt
+/CMakeFiles
+/cmake_install.cmake
+/include
+/libjson-c.a
+/libjson-c.so

json-c/.travis.yml

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+language: cpp
+
+compiler:
+  - gcc
+  - clang
+
+addons:
+  apt:
+    packages:
+      - cppcheck
+
+os:
+  - linux
+  - osx
+
+before_install:
+  - echo $LANG
+  - echo $LC_ALL
+  - set -e
+
+install:
+  - sh autogen.sh
+
+before_script:
+  - ./configure
+
+script:
+  - make
+
+after_success:
+  - make check
+  - if type cppcheck &> /dev/null ; then cppcheck --error-exitcode=1 --quiet *.h *.c tests/ ; fi

json-c/AUTHORS

@@ -0,0 +1,5 @@
+Michael Clark <michael@metaparadigm.com>
+Jehiah Czebotar <jehiah@gmail.com>
+Eric Haszlakiewicz <hawicz+json-c@gmail.com>
+C. Watford (christopher.watford@gmail.com)
+

json-c/Android.configure.mk

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+# This file is the top android makefile for all sub-modules.
+#
+# Suggested settings to build for Android:
+#
+# export PATH=$PATH:/opt/android-ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/
+# export SYSROOT=/opt/android-ndk/platforms/android-9/arch-arm/usr/
+# export LD=arm-linux-androideabi-ld
+# export CC="arm-linux-androideabi-gcc --sysroot=/opt/android-ndk/platforms/android-9/arch-arm"
+#
+# Then run autogen.sh, configure and make.
+#
+
+LOCAL_PATH := $(call my-dir)
+include $(CLEAR_VARS)
+
+json_c_TOP := $(LOCAL_PATH)
+
+JSON_C_BUILT_SOURCES := Android.mk
+
+JSON_C_BUILT_SOURCES := $(patsubst %, $(abspath $(json_c_TOP))/%, $(JSON_C_BUILT_SOURCES))
+
+.PHONY: json-c-configure json-c-configure-real
+json-c-configure-real:
+	echo $(JSON_C_BUILT_SOURCES)
+	cd $(json_c_TOP) ; \
+	$(abspath $(json_c_TOP))/autogen.sh && \
+	CC="$(CONFIGURE_CC)" \
+	CFLAGS="$(CONFIGURE_CFLAGS)" \
+	LD=$(TARGET_LD) \
+	LDFLAGS="$(CONFIGURE_LDFLAGS)" \
+	CPP=$(CONFIGURE_CPP) \
+	CPPFLAGS="$(CONFIGURE_CPPFLAGS)" \
+	PKG_CONFIG_LIBDIR=$(CONFIGURE_PKG_CONFIG_LIBDIR) \
+	PKG_CONFIG_TOP_BUILD_DIR=/ \
+	ac_cv_func_malloc_0_nonnull=yes \
+	ac_cv_func_realloc_0_nonnull=yes \
+	$(abspath $(json_c_TOP))/$(CONFIGURE) --host=$(CONFIGURE_HOST) \
+	--prefix=/system \
+	&& \
+	for file in $(JSON_C_BUILT_SOURCES); do \
+		rm -f $$file && \
+		make -C $$(dirname $$file) $$(basename $$file) ; \
+	done
+
+json-c-configure: json-c-configure-real
+
+PA_CONFIGURE_TARGETS += json-c-configure
+
+-include $(json_c_TOP)/Android.mk