The serialization results incorrect about arduinojson HOT 4 CLOSED

UPDATE.
I figured out the reason, and it seems on the (huge) memory usage. I'm using a 32-bit board and the buffer must be sized way longer than expected.
By running this snippet (notice the buffer size!)...

//
// Step 1: Reserve memory space
//
StaticJsonBuffer<1024> jsonBuffer;

//
// Step 2: Build object tree in memory
//
JsonObject& root = jsonBuffer.createObject();
root["sensor"] = "gps";
root["time"] = 1351824120;

JsonArray& data = root.createNestedArray("data");
//data.add(48.756080, 6);  // 6 is the number of decimals to print
//data.add(2.302038, 6);   // if not specified, 2 digits are printed

for (int i=0; i<100; i++)
{
  JsonObject& jsens = data.createNestedObject();
  jsens.add("name", "tizio");
  jsens.add("value", i);
}

//
// Step 3: Generate the JSON string
//
root.printTo(Serial);

...the result is the following (290 chars):

{"sensor":"gps","time":1351824120,"data":[{"name":"tizio","value":0},{"name":"tizio","value":1},{"name":"tizio","value":2},{"name":"tizio","value":3},{"name":"tizio","value":4},{"name":"tizio","value":5},{"name":"tizio","value":6},{"name":"tizio","value":7},{"name":"tizio","value":8},{}]}

I simply underestimated the actual usage of ram.

from arduinojson.

Yes, memory usage is almost 4 times bigger in 32-bit than in 8-bit.
To write platform independent code, I recommend using the following macros:

• JSON_ARRAY_SIZE(N) which returns the size of an array of N elements
• JSON_OBJECT_SIZE(N) which returns the size of an object of N key-value pairs

In your second last example, it could be:

JSON_OBJECT_SIZE(3)+JSON_ARRAY_SIZE(100)+100*JSON_OBJECT_SIZE(2)

Also, if you're not working in an embedded environment, you can switch to DynamicJsonBuffer which will automatically grow.

from arduinojson.

I'll bear in mind, thank you very much for the help.

Oh, you were mentioned:
https://highfieldtales.wordpress.com/2014/12/29/azure-veneziano-linkit-one/

from arduinojson.

Hey hey.
Congratulations for your project 👍

from arduinojson.