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ESP8266 Wifi Connect & Ping to Azure-based Logic App URL over HTTPS
// WIFI SETUP & LOGIC APP URL
char ssid[] = "YOUR_WIFI_SSID";
char pass[] = "YOUR_WIFI_PASSWORD";
char logicAppURL[] = "https://YOUR_LOGIC_APP_URL";
// HTTP AND WIFI
// Needed to go here & install board support for ESP8266. https://github.com/gojimmypi/ESP8266-Arduino
// This gave access to the WiFiClientSecureBearSSL client library (which is needed for HTTPS).
// See install instructions on that GitHub page.
// Also installed h/w support for the TTGO OLED board I have.
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClientSecureBearSSL.h>
// OLED INCLUDES
#include <Arduino.h>
#include <U8g2lib.h> // make sure to add U8g2 library and restart Arduino IDE
#include <SPI.h>
#include <Wire.h>
#define OLED_SDA 2
#define OLED_SCL 14
#define OLED_RST 4
U8G2_SSD1306_128X32_UNIVISION_F_SW_I2C u8g2(U8G2_R0, OLED_SCL, OLED_SDA , OLED_RST);
ESP8266WiFiMulti WiFiMulti;
void setup()
{
Serial.begin(115200);
Serial.println();
oledInit();
oledPrint("Start...", false);
delay(500);
oledPrint("Wifi connect ..", false);
delay(500);
Serial.print("Connecting to ");
Serial.println(ssid);
WiFiMulti.addAP(ssid, pass);
String progress = ".";
while (WiFiMulti.run() != WL_CONNECTED) {
delay(500);
Serial.print(progress);
oledPrint(progress, false);
progress = progress + ".";
}
oledPrint("Wifi connected", false);
delay(1000);
Serial.println("Calling HTTP");
httpGET(logicAppURL);
}
void loop()
{
delay(10000);
}
void httpGET(String url) {
std::unique_ptr<BearSSL::WiFiClientSecure>client(new BearSSL::WiFiClientSecure);
client->setInsecure();
HTTPClient https;
Serial.print("[HTTPS] begin...\n");
oledPrint("[HTTPS] begin", false);
if (https.begin(*client, url)) { // HTTPS
Serial.print("[HTTPS] GET...\n");
oledPrint("[HTTPS] GET...", false);
// start connection and send HTTP header
int httpCode = https.GET();
// httpCode will be negative on error
if (httpCode > 0) {
// HTTP header has been send and Server response header has been handled
Serial.printf("[HTTPS] GET... code: %d\n", httpCode);
oledPrint("[HTTPS] GET " + String(httpCode), false);
// file found at server
if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
String payload = https.getString();
Serial.println(payload);
}
} else {
Serial.printf("[HTTPS] GET... failed, error: %s\n", https.errorToString(httpCode).c_str());
oledPrint("[HTTPS] GET " + String(https.errorToString(httpCode)), false);
}
https.end();
} else {
Serial.printf("[HTTPS] Unable to connect\n");
oledPrint("[HTTPS] GET Err", false);
}
}
void oledInit() {
Serial.println("OLED Start..");
u8g2.begin();
u8g2.setFont(u8g2_font_6x10_tf);
}
void oledPrint(String message, bool frame) {
char charBuf[15];
message.toCharArray(charBuf, 25);
u8g2.clearBuffer();
u8g2.drawStr(10, 25, charBuf);
if (frame) u8g2.drawRFrame(0,0,128,32,4); // https://github.com/olikraus/u8g2/wiki/u8g2reference#drawrbox
u8g2.sendBuffer();
}
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