Arduinojson: Json Parsing not working on Wemos D1R2

Created on 19 Apr 2017 · 2Comments · Source: bblanchon/ArduinoJson

Hello,

I'm a newbie here but have a decent background with other database languages. I've been trying to use your code to parse a Json response from a weather service. The Json Parser is not returning results for reasons I cannot understand/explain (probably my fault).

The ultimate objective is to parse total rainfall and use this information to offset the irrigation cycle (irrigation system is currently running on an arduino).

Hope you can help
Thanks

_Platform:_ WeMos D1R2

_Code:_
`

include

define USE_SERIAL Serial

include

DynamicJsonBuffer jsonBuffer;
ESP8266WiFiMulti WiFiMulti;

void setup() {
DynamicJsonBuffer jsonBuffer;
USE_SERIAL.begin(115200);
// USE_SERIAL.setDebugOutput(true);

for(uint8_t t = 4; t > 0; t--) {
    USE_SERIAL.printf("[SETUP] WAIT %d...\n", t);
    USE_SERIAL.flush();
    delay(1000);
}

WiFiMulti.addAP("********", "*******");

}

void loop() {
// wait for WiFi connection
if((WiFiMulti.run() == WL_CONNECTED)) {

    HTTPClient http;

    USE_SERIAL.print("[HTTP] begin...\n");
    // configure traged server and url
    //http.begin("https://192.168.1.12/test.html", "7a 9c f4 db 40 d3 62 5a 6e 21 bc 5c cc 66 c8 3e a1 45 59 38"); //HTTPS
    http.begin("http://api.wunderground.com/api/***********/conditions/q/**/******.json"); //HTTP

    USE_SERIAL.print("[HTTP] GET...\n");
    // start connection and send HTTP header
    int httpCode = http.GET();

    // httpCode will be negative on error
    if(httpCode > 0) {
        // HTTP header has been send and Server response header has been handled
        USE_SERIAL.printf("[HTTP] GET... code: %d\n", httpCode);

        // file found at server
        if(httpCode == HTTP_CODE_OK) {
            String payload = http.getString();
            USE_SERIAL.println(payload);
            JsonObject& root = jsonBuffer.parseObject(payload);
            if (!root.success()) {
            Serial.println("parseObject() failed");
            }
            String temp = root["temp_f"];
            USE_SERIAL.println(temp);
        }
    } else {
        USE_SERIAL.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
    }
    http.end();
}
delay(120000);

}
`
_JSON being parsed:_
{
"response": {
"version":"0.1",
"termsofService":"http://www.wunderground.com/weather/api/d/terms.html",
"features": {
"conditions": 1
}
}
, "current_observation": {
"image": {
"url":"http://icons.wxug.com/graphics/wu2/logo_130x80.png",
"title":"Weather Underground",
"link":"http://www.wunderground.com"
},
"display_location": {
"full":"Sunrise, FL",
"city":"Sunrise",
"state":"FL",
"state_name":"Florida",
"country":"US",
"country_iso3166":"US",
"zip":"33323",
"magic":"2",
"wmo":"99999",
"latitude":"26.14999962",
"longitude":"-80.33000183",
"elevation":"3.0"
},
"observation_location": {
"full":"Plantation, FL just off Commadore, Plantation, Florida",
"city":"Plantation, FL just off Commadore, Plantation",
"state":"Florida",
"country":"US",
"country_iso3166":"US",
"latitude":"26.123884",
"longitude":"-80.329079",
"elevation":"19 ft"
},
"estimated": {
},
"station_id":"KFLPLANT24",
"observation_time":"Last Updated on April 18, 11:38 PM EDT",
"observation_time_rfc822":"Tue, 18 Apr 2017 23:38:54 -0400",
"observation_epoch":"1492573134",
"local_time_rfc822":"Tue, 18 Apr 2017 23:40:06 -0400",
"local_epoch":"1492573206",
"local_tz_short":"EDT",
"local_tz_long":"America/New_York",
"local_tz_offset":"-0400",
"weather":"Mostly Cloudy",
"temperature_string":"74.8 F (23.8 C)",
"temp_f":74.8,
"temp_c":23.8,
"relative_humidity":"74%",
"wind_string":"From the NE at 1.0 MPH Gusting to 3.0 MPH",
"wind_dir":"NE",
"wind_degrees":44,
"wind_mph":1.0,
"wind_gust_mph":"3.0",
"wind_kph":1.6,
"wind_gust_kph":"4.8",
"pressure_mb":"1021",
"pressure_in":"30.15",
"pressure_trend":"+",
"dewpoint_string":"66 F (19 C)",
"dewpoint_f":66,
"dewpoint_c":19,
"heat_index_string":"NA",
"heat_index_f":"NA",
"heat_index_c":"NA",
"windchill_string":"NA",
"windchill_f":"NA",
"windchill_c":"NA",
"feelslike_string":"74.8 F (23.8 C)",
"feelslike_f":"74.8",
"feelslike_c":"23.8",
"visibility_mi":"10.0",
"visibility_km":"16.1",
"solarradiation":"--",
"UV":"0","precip_1hr_string":"0.00 in ( 0 mm)",
"precip_1hr_in":"0.00",
"precip_1hr_metric":" 0",
"precip_today_string":"0.00 in (0 mm)",
"precip_today_in":"0.00",
"precip_today_metric":"0",
"icon":"mostlycloudy",
"icon_url":"http://icons.wxug.com/i/c/k/nt_mostlycloudy.gif",
"forecast_url":"http://www.wunderground.com/US/FL/Sunrise.html",
"history_url":"http://www.wunderground.com/weatherstation/WXDailyHistory.asp?ID=KFLPLANT24",
"ob_url":"http://www.wunderground.com/cgi-bin/findweather/getForecast?query=26.123884,-80.329079",
"nowcast":""
}
}