i want to get my thingSpeak channel data into arduino by performing GET request every things works fine.Further i used Arduinojson lib to parse the JSON but i am getting failed every time when i try to parse it.I used arduinojson assistant to calculate the parsing program but still i am getting error. Below is my JSON and Failure message that i got every time in serial monitor.
{"channel":{"id":421932,"name":"remote_car","description":"Nothing up to this point !","latitude":"0.0","longitude":"0.0","field1":"MOTOR ONE","field2":"MOTOR TWO","field3":"MOTOR THREE","field4":"MOTOR FOUR","created_at":"2018-02-07T17:32:09Z","updated_at":"2018-03-17T07:08:49Z","last_entry_id":7},"feeds":[{"created_at":"2018-03-17T06:53:48Z","entry_id":4,"field1":"0"},{"created_at":"2018-03-17T06:59:22Z","entry_id":5,"field1":"0"},{"created_at":"2018-03-17T07:03:59Z","entry_id":6,"field1":"2"},{"created_at":"2018-03-17T07:08:49Z","entry_id":7,"field1":"1"}]}
Parse Failed...
this is my arduino code(i used arduino plus esp8266 to get my thinkSpeak channel data).
#include "WiFiEsp.h"
#include <ArduinoJson.h>
// Emulate Serial1 on pins 6/7 if not present
#ifndef HAVE_HWSERIAL1
#include "SoftwareSerial.h"
SoftwareSerial Serial1(2,3); // RX, TX
#endif
char ssid[] = "M T G"; // your network SSID (name)
char pass[] = "androidGUII"; // your network password
int status = WL_IDLE_STATUS; // the Wifi radio's status
// Initialize the Ethernet client object
WiFiEspClient client;
static const char* host = "api.thingspeak.com";
static const char* apiKey = "H359MYV0P0KFG2VS";
const unsigned long HTTP_TIMEOUT = 10000;
void setup()
{
// initialize serial for debugging
Serial.begin(115200);
// initialize serial for ESP module
Serial1.begin(9600);
// initialize ESP module
WiFi.init(&Serial1);
// check for the presence of the shield
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present");
// don't continue
while (true);
}
// attempt to connect to WiFi network
while ( status != WL_CONNECTED) {
Serial.print("Attempting to connect to WPA SSID: ");
Serial.println(ssid);
// Connect to WPA/WPA2 network
status = WiFi.begin(ssid, pass);
}
// you're connected now, so print out the data
Serial.println("You're connected to the network");
// printWifiStatus();
Serial.println();
}
void loop()
{
const int httpPort = 80;
if (!client.connect(host, httpPort)) {
Serial.println("connection failed");
return;
}
client.print("GET /channels/421932/fields/1.json?api_key=");
client.print(apiKey);
client.println("&results=4 HTTP/1.1");
client.print("Host:");
client.println(host);
client.println();
while (client.available() == 0);
while (!skipResponseHeaders()); // wait till something comes in; you may want to add a timeout here
while (client.available()) { // Now receive the data
String line = client.readStringUntil('\n');
if ( line.indexOf('{',0) >= 0 ) { // Ignore data that is not likely to be JSON formatted, so must contain a '{'
Serial.println(line); // Show the text received
parseData(line);
}
}
client.stop();
delay(10000);
}
void parseData(String data){
const size_t bufferSize = JSON_ARRAY_SIZE(4) + JSON_OBJECT_SIZE(2) + 4*JSON_OBJECT_SIZE(3) + JSON_OBJECT_SIZE(12) + 520;
DynamicJsonBuffer jsonBuffer(bufferSize);
const char* json = data.c_str();
JsonObject& root = jsonBuffer.parseObject(json);
if(!root.success()){
Serial.println("Parse Failed...");
}
JsonObject& channel = root["channel"];
long channel_id = channel["id"]; // 421932
const char* channel_name = channel["name"]; // "remote_car"
const char* channel_description = channel["description"]; // "Nothing up to this point !"
Serial.println(channel_name);
Serial.println(channel_description);
}
bool skipResponseHeaders() {
char endOfHeaders[] = "\r\n\r\n"; // HTTP headers end with an empty line
client.setTimeout(HTTP_TIMEOUT);
bool ok = client.find(endOfHeaders);
if (!ok) { Serial.println("No response or invalid response!"); }
return ok;
}
Any one have any idea how i am getting parsing failed message. Any help would be appreciated.
