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https://github.com/1technophile/OpenMQTTGateway.git
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d8dba15a81
* factoring of the publishing function * integration of json publishing to MQTT * receiving and transcode json messages from mqtt * replace the TRACE runtime condition by a buildtime one so as to decrease program size * remove retainFlag parameter not necessary for the moment * Increase the scope of tests for arduino mega and esp32 * Update arduinojson library to 5.13.3 * add macros to choose between simple or json publishing or both * differentiate build test for ATmega2560 * correct wrong sprintf definition * change IDE version for continuous integration * let default warning level in arduino ide * correct pins for ESP32 * reorganize user_config
ArduinoJson is a C++ JSON library for Arduino and IoT (Internet Of Things).
Features
- JSON decoding (comments are supported)
- JSON encoding (with optional indentation)
- Elegant API, easy to use
- Fixed memory allocation (zero malloc)
- No data duplication (zero copy)
- Portable (written in C++98, can be used in any C++ project)
- Self-contained (no external dependency)
- Small footprint
- Input and output streams
- 100% code coverage
- Header-only library
- MIT License
- Comprehensive documentation
Compatibility
ArduinoJson works on the following hardware:
Arduino boards: Uno, Due, Mini, Micro, Yun...
Espressif chips: ESP8266, ESP32
WeMos boards: D1, D1 mini, ...
RedBearLab boards: BLE Nano, BLE Mini, WiFi Micro, LOLIN32...
Teensy boards
Intel boards: Edison, Galileo...
Particle boards: Photon, Electron...Texas Instruments boards: MSP430...
ArduinoJson compiles with zero warning on the following compilers, IDEs, and platforms:
PlatformIO
Energia
Visual MicroAtmel Studio
IAR Embedded Workbench
Atollic TrueSTUDIOKeil uVision
MPLAB X IDE
GCC
Clang
Visual Studio
Quickstart
Deserialization
Here is a program that parses a JSON document with ArduinoJson.
char json[] = "{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
StaticJsonBuffer<200> jsonBuffer;
JsonObject& root = jsonBuffer.parseObject(json);
const char* sensor = root["sensor"];
long time = root["time"];
double latitude = root["data"][0];
double longitude = root["data"][1];
See the tutorial on arduinojson.org
Serialization
Here is a program that generates a JSON document with ArduinoJson:
StaticJsonBuffer<200> jsonBuffer;
JsonObject& root = jsonBuffer.createObject();
root["sensor"] = "gps";
root["time"] = 1351824120;
JsonArray& data = root.createNestedArray("data");
data.add(48.756080);
data.add(2.302038);
root.printTo(Serial);
// This prints:
// {"sensor":"gps","time":1351824120,"data":[48.756080,2.302038]}
See the tutorial on arduinojson.org
Documentation
The documentation is available on arduinojson.org, here are some shortcuts:
- The Examples show how to use the library in various situations.
- The API Reference contains the description of each class and function.
- The FAQ has the answer to virtually every question.
- The ArduinoJson Assistant writes programs for you!
Do you like this library? Please star this project on GitHub!
What? You don't like it but you love it? We don't take donations anymore, but we sell a book, so you can help and learn at the same time!