upgrade ArduinoJSON to API v6

src/main.cpp

@@ -144,69 +144,68 @@ void lightsleep() {
 }
 
 void ICACHE_FLASH_ATTR getValuesJSON(char* buffer, const size_t buf_len, int format) {
-  StaticJsonBuffer<MQTT_MAX_PACKET_SIZE> jsonBuffer;  // ToDo: buf_len
+  StaticJsonDocument<MQTT_MAX_PACKET_SIZE> jsonDoc;  // ToDo: buf_len
 
   if (format == 1) {
-    JsonArray& array = jsonBuffer.createArray();
+    JsonArray array = jsonDoc.to<JsonArray>();
 
-    JsonObject& temperatureObject = array.createNestedObject();
+    JsonObject temperatureObject = array.createNestedObject();
     temperatureObject["sensor"] = SENSOR1_ID;
     temperatureObject["value"] = sd.temperature;
-    JsonObject& humidityObject = array.createNestedObject();
+    JsonObject humidityObject = array.createNestedObject();
     humidityObject["sensor"] = SENSOR2_ID;
     humidityObject["value"] = sd.humidity;
-    JsonObject& pressureObject = array.createNestedObject();
+    JsonObject pressureObject = array.createNestedObject();
     pressureObject["sensor"] = SENSOR3_ID;
     pressureObject["value"] = sd.pressure;
     if (sd.sds_updated) {
-      JsonObject& pm10Object = array.createNestedObject();
+      JsonObject pm10Object = array.createNestedObject();
       pm10Object["sensor"] = SENSOR4_ID;
       pm10Object["value"] = sd.p10;
-      JsonObject& pm25Object = array.createNestedObject();
+      JsonObject pm25Object = array.createNestedObject();
       pm25Object["sensor"] = SENSOR5_ID;
       pm25Object["value"] = sd.p25;
     }
     if (sd.cpm > 0) {
-      JsonObject& cpmObject = array.createNestedObject();
+      JsonObject cpmObject = array.createNestedObject();
       cpmObject["sensor"] = SENSOR6_ID;
       cpmObject["value"] = sd.radioactivity;
     }
     if (sd.voltage > 2.5 ) {
-      JsonObject& voltageObject = array.createNestedObject();
+      JsonObject voltageObject = array.createNestedObject();
       voltageObject["sensor"] = SENSOR7_ID;
       voltageObject["value"] = sd.voltage;
     }
     if (sd.rssi != 0) {
-      JsonObject& rssiObject = array.createNestedObject();
+      JsonObject rssiObject = array.createNestedObject();
       rssiObject["sensor"] = SENSOR8_ID;
       rssiObject["value"] = sd.rssi;
     }
 
-    array.printTo(buffer, buf_len);
+    serializeJson(jsonDoc, buffer, buf_len);
   } else if (format == 2) {
-    JsonObject& root = jsonBuffer.createObject();
 
-    root["temperature"] = sd.temperature;
-    root["humidity"] = sd.humidity;
-    root["pressure"] = sd.pressure;
+    jsonDoc["temperature"] = sd.temperature;
+    jsonDoc["humidity"] = sd.humidity;
+    jsonDoc["pressure"] = sd.pressure;
     if (sd.sds_updated) {
-      root["pm10"] = sd.p10;
-      root["pm2.5"] = sd.p25;
+      jsonDoc["pm10"] = sd.p10;
+      jsonDoc["pm2.5"] = sd.p25;
     }
     if (sd.cpm > 0) {
-      root["cpm"] = sd.cpm;
-      root["radioactivity"] = sd.radioactivity;
+      jsonDoc["cpm"] = sd.cpm;
+      jsonDoc["radioactivity"] = sd.radioactivity;
     }
     if (sd.voltage > 2.5 ) {
-      root["voltage"] = sd.voltage;
+      jsonDoc["voltage"] = sd.voltage;
     }
     if (sd.rssi != 0) {
-      root["rssi"] = sd.rssi;
+      jsonDoc["rssi"] = sd.rssi;
     }
-//    root["millis"] = millis();
-//    root["heap"] = ESP.getFreeHeap();
+//    jsonDoc["millis"] = millis();
+//    jsonDoc["heap"] = ESP.getFreeHeap();
 
-    root.printTo(buffer, buf_len);
+    serializeJson(jsonDoc, buffer, buf_len);
   }
 }