root.printTo( buff, sizeof(buff)) introduces : at random times

[jescarri]

It also seems that the float conversion is not working. It changes the values
as you can see the temperature reported is different from what is resulting in the conversion

Hardware: NodeMCU v1.0

Humidity at json conv 44.00
Temp at json conv 27.40
HIC at json conv 27.40
{"node_id":"S1","sensor_list":["DHT","BMP"],"satus":"ok","vcc":2770,"dht_failures":1,"temp":27.3:,"humidity":44.00,"hic":27.40,"pressure":1.00e3}

code:

char *build_json( boolean dht_read_ok, float t, float h, float hic, double pressure, int dht_failures){
  char buff[JBUFF];
  char p_buff[15];
  StaticJsonBuffer<200> jsonBuffer;
  JsonObject& root = jsonBuffer.createObject();
  root["node_id"] = "S1";
  JsonArray& data = root.createNestedArray("sensor_list");
  data.add("DHT");
  #if defined (BMPPRESENT)
    data.add("BMP");
  #endif
  if ( dht_read_ok == true ){
    root["satus"] = "ok";
    root["vcc"] = ESP.getVcc();
    root["dht_failures"] = dht_failures;
    root["temp"] = t;
    root["humidity"] = h;
    Serial.print("Humidity at json conv ");
    Serial.println(h);
    Serial.print("Temp at json conv ");
    Serial.println(t);
    Serial.print("HIC at json conv ");
    Serial.println(hic);
    root["hic"] = hic;
    #if defined (BMPPRESENT)
       root["pressure"] = atof(deblank(dtostrf(pressure,11,3,p_buff)));
    #endif
    root.printTo(buff, sizeof(buff));
  }else{
    root["satus"] = "error";
    root["dht_failures"] = dht_failures;
    root.printTo( buff, sizeof(buff));
  }
  return buff;
}

Latest Arduino Json Library

Output:

.......
WiFi connected
IP address: 
192.168.1.39
18:FE:34:CF:7D:0F
SeaLevel Comp pressure 
1004.64
nan
nan
Failed to read from DHT sensor!
44.00
27.40
 Reconecting
Attempting MQTT connection...connected
Humidity at json conv 44.00
Temp at json conv 27.40
HIC at json conv 27.40
{"node_id":"S1","sensor_list":["DHT","BMP"],"satus":"ok","vcc":2770,"dht_failures":1,"temp":27.3:,"humidity":44.00,"hic":27.40,"pressure":1.00e3}
Entering deep sleep mode for 1 secs 

Notice the : at the humidity reading

a good json output:

...........
WiFi connected
IP address: 
192.168.1.39
18:FE:34:CF:7D:0F
SeaLevel Comp pressure 
1004.67
nan
nan
Failed to read from DHT sensor!
44.00
27.50
 Reconecting
Attempting MQTT connection...connected
Humidity at json conv 44.00
Temp at json conv 27.50
HIC at json conv 27.49
{"node_id":"S1","sensor_list":["DHT","BMP"],"satus":"ok","vcc":2770,"dht_failures":1,"temp":27.50,"humidity":44.00,"hic":27.49,"pressure":1.00e3}
Entering deep sleep mode for 1 secs 

[jescarri]

Parse errors:

795: unexpected token at '{"node_id":"S1","sensor_list":["DHT","BMP"],"satus":"ok","vcc":2769,"dht_failures":1,"temp":27.3:,"humidity":44.40,"hic":27.43,"pressure":1.00e3}'
795: unexpected token at '{"node_id":"S1","sensor_list":["DHT","BMP"],"satus":"ok","vcc":2767,"dht_failures":1,"temp":27.3:,"humidity":44.2:,"hic":27.42,"pressure":1.00e3}'
795: unexpected token at '{"node_id":"S1","sensor_list":["DHT","BMP"],"satus":"ok","vcc":2770,"dht_failures":1,"temp":27.3:,"humidity":44.2:,"hic":27.42,"pressure":1.00e3}'

It looks that is something regarding the float conversion

[bblanchon]

This bug is fixed in version 5.6.4.

@jescarri Thank you very much for reporting this issue 👍

[jescarri]

Thanks for the quick turnaround!!!
Appreciate it!.