third-party: bump arduino-json to 5.2

.travis.yml

@@ -10,6 +10,6 @@ install:
 - ( cd ${ARDUINO_ESP8266_ROOT}/tools && python get.py )
 before_script:
 - mkdir -p ${ARDUINO_HOME}/libraries
-- ( cd ${ARDUINO_HOME}/libraries && ln -s ${TRAVIS_BUILD_DIR} firebase-arduino && ln -s ${TRAVIS_BUILD_DIR}/src/third-party/arduino-json-5.1.1 ArduinoJson )
+- ( cd ${ARDUINO_HOME}/libraries && ln -s ${TRAVIS_BUILD_DIR} firebase-arduino && ln -s ${TRAVIS_BUILD_DIR}/src/third-party/arduino-json-5.2 ArduinoJson )
 script:
 - ${ARDUINO_ROOT}/arduino-builder -verbose  -hardware ${ARDUINO_ROOT}/hardware/ -tools ${ARDUINO_ESP8266_ROOT}/tools/ -tools ${ARDUINO_ROOT}/tools-builder/ -fqbn esp8266com:esp8266:nodemcuv2 -libraries ${ARDUINO_HOME}/libraries/ -prefs build.flash_ld=${ARDUINO_ESP8266_ROOT}/tools/sdk/ld/eagle.flash.4m.ld -prefs build.flash_freq=40 -prefs build.flash_size=4M examples/FirebasePush_ESP8266/FirebasePush_ESP8266.ino

src/Firebase.h

@@ -26,7 +26,7 @@
 // TODO(edcoyne): move this into our mock_arduino fork where we actually do the
 // override.
 #define ARDUINO_STRING_OVERRIDE
-#include "third-party/arduino-json-5.1.1/include/ArduinoJson.h"
+#include "third-party/arduino-json-5.2/include/ArduinoJson.h"
 
 class FirebaseGet;
 class FirebaseSet;

src/third-party/arduino-json-5.1.1/CHANGELOG.md → src/third-party/arduino-json-5.2/CHANGELOG.md

@@ -1,6 +1,14 @@
 ArduinoJson: change log
 =======================
 
+v5.2.0
+------
+
+* Added `JsonVariant::as<char*>()` as a synonym for `JsonVariant::as<const char*>()` (issue #257)
+* Added example `JsonHttpClient` (issue #256)
+* Added `JsonArray::copyTo()` and `JsonArray::copyFrom()` (issue #254)
+* Added `RawJson()` to insert pregenerated JSON portions (issue #259)
+
 v5.1.1
 ------
 

src/third-party/arduino-json-5.1.1/README.md → src/third-party/arduino-json-5.2/README.md

@@ -15,7 +15,8 @@ Features
 * JSON decoding (comments are supported)
 * JSON encoding (with optional indentation)
 * Elegant API, very easy to use
-* Efficient (no malloc, nor copy)
+* Fixed memory allocation (zero malloc)
+* No data duplication (zero copy)
 * Portable (written in C++98)
 * Self-contained (no external dependency)
 * Small footprint
@@ -91,19 +92,19 @@ From StackOverflow user `thegreendroid`:
 > It has a really elegant, simple API and it works like a charm on embedded and Windows/Linux platforms. We recently started using this on an embedded project and I can vouch for its quality.
 
 From GitHub user `zacsketches`:
-
 > Thanks for a great library!!!
 > I've been watching you consistently develop this library over the past six months, and I used it today for a publish and subscribe architecture designed to help hobbyists move into more advanced robotics. Your library allowed me to implement remote subscription in order to facilitate multi-processor robots.
 > ArduinoJson saved me a week's worth of time!!
 
 [From Reddit user `erm_what_`](https://www.reddit.com/r/arduino/comments/3jj6ep/announcing_arduinojson_50/cusjk8c):
-
 > This is a great library and I wouldn't be able to do the project I'm doing without it. I completely recommend it.
 
 [From Reddit user `makerhacks`](https://www.reddit.com/r/arduino/comments/3jj6ep/announcing_arduinojson_50/cusqg7b):
-
 > I am just starting an ESP8266 clock project and now I can output JSON from my server script and interpret it painlessly.
 
+[From Twitter user `@hemalchevli`](https://twitter.com/hemalchevli/status/715788439397011456):
+> ArduinoJson library should be used as a benchmark/reference for making libraries. Truly elegant.
+
 Donators
 --------
 
@@ -116,6 +117,7 @@ Special thanks to the following persons and companies who made generous donation
 * A B Doodkorte
 * Scott Smith
 * Johann Stieger
+* Gustavo Donizeti Gini
 
 ---