bblanchon ( Benoît Blanchon )

Is it possible to write directly to a stream with AduinoJson, like a JsonWriter class? Is it at all possible to directly write to a stream using your library and do serialization on the fly?

Much like the JsonWriter classes out there: e.g. https://github.com/timnew/ArduinoJsonWriter

I have seen many "direct writing" classes out there, but to me it is really not clear if your library always writes to memory first, and then serializes into a (buffered) stream.

How does that work with your library, maybe I am just missing something.

Thanks for explaining.

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PublicEvent

issue commentbblanchon/ArduinoJson

cannot enable STD_STRING

@bblanchon Thanks for your reply! Done that but still not working...

fabioinfo44

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startedbblanchon/ArduinoJson

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issue openedbblanchon/ArduinoJson

ESP8266, PubSubClient - Speed parity between publish methods.

Before I begin, this is a fantastic library and the eBook has been a huge game changer for me with respect to optimizing the use of this library in my projects, so thanks 👍.

This issue, is not exactly a bug but more an observation which I would appreciate some help in understanding / resolving.

Essentially, if I use the method of sending a payload using the PubSubClient as described here everything works as expected and the data finishes publishing rapidly.

However, the PubSubClient has a write method --> DOCS, that means we don't have to create a char buffer before sending, helping preserve some precious memory. Below is my usage

   mqttClient.beginPublish(topic, measureJson(payload), false);
   serializeJson(payload, mqttClient);
   if (mqttClient.endPublish()) {
           DEBUG_APP("MQTT Send Success to %s\n", topic);
           return true;
    } else {
           DEBUG_APP("MQTT Send Failed: Len --> %d Topic:%s\n",measureJson(payload), topic);
           return false;
    }

This works, the data gets sent as expected, however there is a huge time penalty, in the order of seconds for the same payload. (I haven't had a chance to get the actual time penalty.)

Would you have any pointers as to what I can look into to use this method and gain the speed back, not creating temp buffers to me seems like a win, but not at the speed penalty.

Many Thanks,

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issue openedbblanchon/ArduinoJson

cannot enable STD_STRING

lib\ArduinoJson\src/ArduinoJson/Serialization/Writer.hpp:18:26: error: 'const class String' has no member named 'write'
     return _dest->write(c);
                          ^

```Searching here for this issue I came across on PlatformIO, I found that I should do the following defines, but I tried both together and once at a time and the error persists.

#define ARDUINOJSON_ENABLE_STD_STREAM 1 #define ARDUINOJSON_ENABLE_STD_STRING 1 #include <ArduinoJson.h>

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