AsyncCallbackJsonWebHandler did not supports ArduinoJson 6+

[nsnake]

When i works on ArduinoJson 6.19.4 with AsyncCallbackJsonWebHandler looks like

    AsyncCallbackJsonWebHandler *handler = new AsyncCallbackJsonWebHandler("/msg", [](AsyncWebServerRequest *request, JsonVariant &json)
                                                                           {
                                                                               JsonObject &jsonObj = json.as<JsonObject>();

                                                                               AsyncResponseStream *response = request->beginResponseStream("application/json");
                                                                               DynamicJsonBuffer jsonBuffer;
                                                                               JsonObject &root = jsonBuffer.createObject();
                                                                               root["code"] = 200;
                                                                               root["msg"] = "ok";
                                                                               root.printTo(*response);
                                                                               request->send(response);
                                                                           });

It will be many errors like that DynamicJsonBuffer is noly works on ArduinoJson 5.

Colud be supports ArduinoJson 6+ ？ Thanks.

[marchingband]

+1

[LongHairedHacker]

Since I just stumbled upon that particular problem myself: ArduinoJson has deprecated JsonBuffer in favour of JsonDocument, which is a nicer/better abstraction. Also the printTo method was removed in favour of a global serializeJson method. See https://arduinojson.org/v6/doc/upgrade/ for more details.

The above code using the new API should look like this:

    AsyncCallbackJsonWebHandler *handler = new AsyncCallbackJsonWebHandler("/msg", [](AsyncWebServerRequest *request, JsonVariant &json)
       {
           JsonObject jsonObj = json.as<JsonObject>();

           AsyncResponseStream *response = request->beginResponseStream("application/json");
           DynamicJsonDocument jsonDoc(1024);
           JsonObject root = jsonDoc.to<JsonObject>();
           root["code"] = 200;
           root["msg"] = "ok";
           serializeJson(jsonDoc, *response);
           request->send(response);
       });

[stale[bot]]

[STALE_SET] This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.