Created
May 25, 2023 00:53
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| /* | |
| * ESP8266 JSON Decode of server response | |
| * -Manoj R. Thkuar | |
| * https://circuits4you.com | |
| */ | |
| #include <ESP8266WiFi.h> | |
| #include <WiFiClient.h> | |
| #include <ESP8266HTTPClient.h> | |
| #include <ArduinoJson.h> | |
| const char* wifiName = "wifi-name"; | |
| const char* wifiPass = "wifi-password"; | |
| //Web Server address to read/write from | |
| const char *host = "https://fit2sell.herokuapp.com/rafael"; | |
| void setup() { | |
| Serial.begin(115200); | |
| delay(10); | |
| Serial.println(); | |
| Serial.print("Connecting to "); | |
| Serial.println(wifiName); | |
| WiFi.begin(wifiName, wifiPass); | |
| while (WiFi.status() != WL_CONNECTED) { | |
| delay(500); | |
| Serial.print("."); | |
| } | |
| Serial.println(""); | |
| Serial.println("WiFi connected"); | |
| Serial.println("IP address: "); | |
| Serial.println(WiFi.localIP()); //You can get IP address assigned to ESP | |
| } | |
| void loop() { | |
| HTTPClient http; //Declare object of class HTTPClient | |
| Serial.print("Request Link:"); | |
| Serial.println(host); | |
| http.begin(host); //Specify request destination | |
| int httpCode = http.GET(); //Send the request | |
| String payload = http.getString(); //Get the response payload from server | |
| Serial.print("Response Code:"); //200 is OK | |
| Serial.println(httpCode); //Print HTTP return code | |
| Serial.print("Returned data from Server:"); | |
| Serial.println(payload); //Print request response payload | |
| if(httpCode == 200) | |
| { | |
| // Allocate JsonBuffer | |
| // Use arduinojson.org/assistant to compute the capacity. | |
| const size_t capacity = JSON_OBJECT_SIZE(3) + JSON_ARRAY_SIZE(2) + 60; | |
| DynamicJsonBuffer jsonBuffer(capacity); | |
| // Parse JSON object | |
| JsonObject& root = jsonBuffer.parseObject(payload); | |
| if (!root.success()) { | |
| Serial.println(F("Parsing failed!")); | |
| return; | |
| } | |
| // Decode JSON/Extract values | |
| Serial.println(F("Response:")); | |
| Serial.println(root["sensor"].as<char*>()); | |
| Serial.println(root["time"].as<char*>()); | |
| Serial.println(root["data"][0].as<char*>()); | |
| Serial.println(root["data"][1].as<char*>()); | |
| } | |
| else | |
| { | |
| Serial.println("Error in response"); | |
| } | |
| http.end(); //Close connection | |
| delay(5000); //GET Data at every 5 seconds | |
| } |
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