Post example

/* * HTTPS Secured Client POST Request * Copyright (c) 2019, circuits4you.com * All rights reserved. * https://circuits4you.com * Connects to WiFi HotSpot. */ #include <ESP8266WiFi.h> #include <WiFiClientSecure.h> #include <ESP8266WebServer.h> #include <ESP8266HTTPClient.h> /* Set these to your desired credentials. */ const char *ssid = "your_ssid";  //ENTER YOUR WIFI SETTINGS const char *password = "your_pass"; //Link to read data from https://jsonplaceholder.typicode.com/comments?postId=7 //Web/Server address to read/write from const char *host = "postman-echo.com"; const int httpsPort = 443;  //HTTPS= 443 and HTTP = 80 //SHA1 finger print of certificate use web browser to view and copy const char fingerprint[] PROGMEM = "A6 5A 41 2C 0E DC FF C3 16 E8 57 E9 F2 C3 11 D2 71 58 DF D9"; //======================================================================= //                    Power on setup //======================================================================= void setup() {   delay(1000);   Serial.begin(115200);   WiFi.mode(WIFI_OFF);        //Prevents reconnection issue (taking too long to connect)   delay(1000);   WiFi.mode(WIFI_STA);        //Only Station No AP, This line hides the viewing of ESP as wifi hotspot      WiFi.begin(ssid, password);     //Connect to your WiFi router   Serial.println("");   Serial.print("Connecting");   // Wait for connection   while (WiFi.status() != WL_CONNECTED) {     delay(500);     Serial.print(".");   }   //If connection successful show IP address in serial monitor   Serial.println("");   Serial.print("Connected to ");   Serial.println(ssid);   Serial.print("IP address: ");   Serial.println(WiFi.localIP());  //IP address assigned to your ESP } //======================================================================= //                    Main Program Loop //======================================================================= void loop() {   WiFiClientSecure httpsClient;    //Declare object of class WiFiClient   Serial.println(host);   Serial.printf("Using fingerprint '%s'\n", fingerprint);   httpsClient.setFingerprint(fingerprint);   httpsClient.setTimeout(15000); // 15 Seconds   delay(1000);      Serial.print("HTTPS Connecting");   int r=0; //retry counter   while((!httpsClient.connect(host, httpsPort)) && (r < 30)){       delay(100);       Serial.print(".");       r++;   }   if(r==30) {     Serial.println("Connection failed");   }   else {     Serial.println("Connected to web");   }      String getData, Link;      //POST Data   Link = "/post";   Serial.print("requesting URL: ");   Serial.println(host);   /*    POST /post HTTP/1.1    Host: postman-echo.com    Content-Type: application/x-www-form-urlencoded    Content-Length: 13       say=Hi&to=Mom         */   httpsClient.print(String("POST ") + Link + " HTTP/1.1\r\n" +                "Host: " + host + "\r\n" +                "Content-Type: application/x-www-form-urlencoded"+ "\r\n" +                "Content-Length: 13" + "\r\n\r\n" +                "say=Hi&to=Mom" + "\r\n" +                "Connection: close\r\n\r\n");   Serial.println("request sent");                      while (httpsClient.connected()) {     String line = httpsClient.readStringUntil('\n');     if (line == "\r") {       Serial.println("headers received");       break;     }   }   Serial.println("reply was:");   Serial.println("==========");   String line;   while(httpsClient.available()){             line = httpsClient.readStringUntil('\n');  //Read Line by Line     Serial.println(line); //Print response   }   Serial.println("==========");   Serial.println("closing connection");        delay(2000);  //POST Data at every 2 seconds } //=======================================================================

Upload the code and open serial monitor, in

client.print(String("POST ") + url + " HTTP/1.1\r\n" + "Host: " + host + "\r\n" + "Connection: close\r\n"+ "Content-Length: " + data.length() + "\r\n" + "Content-Type: application/json;charset=UTF-8\r\n\r\n"+ data +"\r\n");

String postRequest =

"POST " + uri + " HTTP/1.0\r\n" +

"Host: " + server + "\r\n" +

"Accept: *" + "/" + "*\r\n" +

"Content-Length: " + data.length() + "\r\n" +

"Content-Type: application/x-www-form-urlencoded\r\n" +

"\r\n" + data;

#include <ESP8266HTTPClient.h> // head of program

const char *host = "http://URL to page";

// Below in the Loop
HTTPClient http;    //Declare object of class HTTPClient

  //Post Data
  String postData = "data=" + data ;

  http.begin(host);              //Specify request destination
  delay(1000); // See if this prevents the problm with connection refused and deep sleep
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");    //Specify content-type header

  int httpCode = http.POST(postData);   //Send the request
  String payload = http.getString();    //Get the response payload

  Serial.println(httpCode);   //Print HTTP return code
  Serial.println(payload);    //Print request response payload

  http.end();  //Close connection

#include <ESP8266WiFi.h> #include <ESP8266HTTPClient.h> // WiFi parameters to be configured const char* ssid = "ssid"; // Hoofdlettergevoelig const char* password = "wachtwoord"; // Hoofdlettergevoelig void setup(void) {   Serial.begin(9600);   Serial.print("Bezig met verbinden");   WiFi.begin(ssid, password); // Connect to WiFi   // while wifi not connected yet, print '.'   // then after it connected, get out of the loop   while (WiFi.status() != WL_CONNECTED) {      delay(500);      Serial.print(".");   }      // Verbonden.   Serial.println("OK!");      // Access Point (SSID).   Serial.print("SSID: ");   Serial.println(WiFi.SSID());      // IP adres.   Serial.print("IP: ");   Serial.println(WiFi.localIP());   // Signaalsterkte.   long rssi = WiFi.RSSI();   Serial.print("Signaal sterkte (RSSI): ");   Serial.print(rssi);   Serial.println(" dBm");   Serial.println(""); } void loop() { if(WiFi.status()== WL_CONNECTED){ //Check WiFi connection status    HTTPClient http; //Declare object of class HTTPClient       http.begin("http://jsonplaceholder.typicode.com/users"); //Specify request destination    http.addHeader("Content-Type", "text/plain"); //Specify content-type header    int httpCode = http.POST("Hallo Wereld!"); //Send the request    String payload = http.getString();  //Get the response payload    Serial.println(httpCode); //Print HTTP return code    Serial.println(payload); //Print request response payload    http.end();  //Close connection   } else {     Serial.println("Error in WiFi connection");     }   delay(30000);  //Send a request every 30 seconds }

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POST /esppost.php HTTP/1.0 Host: serverconnect.site88.net Accept: */* Content-Length: "name1=value1&name2=value2".Length Content-Type: application/x-www-form-urlencoded name1=value1&name2=value2 Code 1) Include the ESP8266WiFi library and initialize variables for hardware and data collection. Edit the network information and write API key in your code. #include <ESP8266WiFi.h> // Network information. #define WIFI_NAME "YOUR_WIFI_NAME" #define PASSWORD "WIFI_PASSWORD" // Hardware information. #define SENSOR_POWER 13 // Connect the power for the soil sensor here. #define SOIL_PIN A0 // Connect the sensor output pin here. #define TIMEOUT 5000 // Timeout for server response. #define SLEEP_TIME_SECONDS 1800 // ThingSpeak information. #define NUM_FIELDS 2 // To update more fields, increase this number and add a field label below. #define SOIL_MOISTURE_FIELD 1 // ThingSpeak field for soil moisture measurement. #define ELAPSED_TIME_FIELD 2 // ThingSpeak field for elapsed time from startup. #define THING_SPEAK_ADDRESS "api.thingspeak.com" String writeAPIKey="XXXXXXXXXXXXXXXX"; // Change this to the write API key for your channel. // Global variables. int numMeasure = 5; // Number of measurements to average. int ADCValue = 0; // Moisture sensor reading. WiFiClient client; 2) In the setup function, start the serial monitor, connect to the wireless network, and initialize the device pins that you use. // Put your setup code here, to run once: void setup() { Serial.begin( 115200 ); // You may need to adjust the speed depending on your hardware. connectWifi(); pinMode( SENSOR_POWER , OUTPUT ); digitalWrite( SENSOR_POWER , LOW ); // Set to LOW so no power is flowing through the sensor. } 3) In the main loop, read the soil monitor and store it in the data array. POST the data to ThingSpeak, and then put the device in low-power mode. // Put your main code here, to run repeatedly: void loop() { // Write to successive fields in your channel by filling fieldData with up to 8 values. String fieldData[ NUM_FIELDS ]; // You can write to multiple fields by storing data in the fieldData[] array, and changing numFields. // Write the moisture data to field 1. fieldData[ SOIL_MOISTURE_FIELD ] = String( readSoil( numMeasure ) ); Serial.print( "Soil Moisture = " ); Serial.println( fieldData[ SOIL_MOISTURE_FIELD ] ); // Write the elapsed time from startup to Field 2. fieldData[ ELAPSED_TIME_FIELD ] = String( millis() ); HTTPPost( NUM_FIELDS , fieldData ); delay( 1000 ); Serial.print( "Goodnight for "+String( SLEEP_TIME_SECONDS ) + " Seconds" ); ESP.deepSleep( SLEEP_TIME_SECONDS * 1000000 ); // If you disable sleep mode, add delay so you don't post to ThingSpeak too often. // delay( 20000 ); } 4) Use the readSoil function to provide power to the sensor, and then read the voltage at the output using the ADC. Turn off the power after measurement. // This function reads the soil moisture sensor numAve times and returns the average. long readSoil(int numAve) { long ADCValue = 0; for ( int i = 0; i < numAve; i++ ) { digitalWrite( SENSOR_POWER, HIGH ); // Turn power to device on. delay(10); // Wait 10 milliseconds for sensor to settle. ADCValue += analogRead( SOIL_PIN ); // Read the value from sensor. digitalWrite( SENSOR_POWER, LOW ); // Turn power to device off. } ADCValue = ADCValue / numAve; return ADCValue; // Return the moisture value. } 5) Connect your device to the wireless network using the connectWiFi function. // Connect to the local Wi-Fi network int connectWifi() { while (WiFi.status() != WL_CONNECTED) { WiFi.begin( WIFI_NAME , PASSWORD ); Serial.println( "Connecting to Wi-Fi" ); delay( 2500 ); } Serial.println( "Connected" ); // Inform the serial monitor. } 6) Build the data string to post to your channel. Connect to ThingSpeak, and use the Wi-Fi client to complete an HTTP POST. // This function builds the data string for posting to ThingSpeak // and provides the correct format for the wifi client to communicate with ThingSpeak. // It posts numFields worth of data entries, and takes the // data from the fieldData parameter passed to it. int HTTPPost( int numFields , String fieldData[] ){ if (client.connect( THING_SPEAK_ADDRESS , 80 )){ // Build the postData string. // If you have multiple fields, make sure the sting does not exceed 1440 characters. String postData= "api_key=" + writeAPIKey ; for ( int fieldNumber = 1; fieldNumber < numFields+1; fieldNumber++ ){ String fieldName = "field" + String( fieldNumber ); postData += "&" + fieldName + "=" + fieldData[ fieldNumber ]; } // POST data via HTTP. Serial.println( "Connecting to ThingSpeak for update..." ); Serial.println(); client.println( "POST /update HTTP/1.1" ); client.println( "Host: api.thingspeak.com" ); client.println( "Connection: close" ); client.println( "Content-Type: application/x-www-form-urlencoded" ); client.println( "Content-Length: " + String( postData.length() ) ); client.println(); client.println( postData ); Serial.println( postData ); String answer=getResponse(); Serial.println( answer ); } else { Serial.println ( "Connection Failed" ); } } 7) Wait for and receive the response from the server using getResponse. // Wait for a response from the server indicating availability, // and then collect the response and build it into a string. String getResponse(){ String response; long startTime = millis(); delay( 200 ); while ( client.available() < 1 && (( millis() - startTime ) < TIMEOUT ) ){ delay( 5 ); } if( client.available() > 0 ){ // Get response from server. char charIn; do { charIn = client.read(); // Read a char from the buffer. response += charIn; // Append the char to the string response. } while ( client.available() > 0 ); } client.stop(); return response; }