add 13 api fetch

13_dadjokez/.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

13_dadjokez/.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

13_dadjokez/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32dev]
+platform = espressif32
+board = esp32dev
+framework = arduino
+monitor_speed = 115200
+lib_deps = 
+	bblanchon/ArduinoJson@^7.3.1 ;^-> ALT 94 (držím celou dobu alt a čísla stisknu na numericke klavesnici a pak pustím alt)

13_dadjokez/src/main.cpp

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+#include <Arduino.h>
+#include <WiFi.h>
+#include <HTTPClient.h>
+#include <ArduinoJson.h>
+
+const char* ssid = "12XKM";
+const char* password = "ProsimTeNevim";
+
+HTTPClient http;
+const char* apiUrl = "https://icanhazdadjoke.com";
+const int fetchInterval = 15000; //1000ms=1s
+
+void fetchAndPrintDadJoke() {
+  Serial.println("---Zacinam stahovat vtip---");
+
+  http.begin(apiUrl);
+  http.addHeader("Accept","application/json");
+  http.addHeader("User-Agent","ESP32 student project for API testing");
+  int httpCode = http.GET();
+
+  if(httpCode > 0) {
+    Serial.printf("Server odpověděl HTTP Kodem: %d\n",httpCode);
+    
+    if(httpCode == HTTP_CODE_OK) {
+      String payload = http.getString();
+      JsonDocument doc;
+      DeserializationError error = deserializeJson(doc,payload);
+      if(error) {
+        Serial.print("Chyb pri parsovani JSONu:");
+        Serial.println(error.c_str());
+      } else {
+        const char* joke = doc["joke"];
+        if(joke){
+          Serial.println("-------JOKE-------");
+          Serial.println(joke);
+          Serial.println("--------------");
+        } else {
+          Serial.println("Chyba: klič 'joke' nenalezen JSON odpovědi");
+          Serial.println("Prijaty JSON (pro kontrolu):");
+          Serial.println(payload);
+        }
+      }
+
+    } else {
+       //třeba při 404 nebo 500
+      Serial.printf("Server vratil chybny HTTP kod: %d\n", httpCode);
+      String errorPayload = http.getString();
+      Serial.println("Telo chybove hlasky:");
+      Serial.println(errorPayload);
+    }
+
+  } else {
+    Serial.printf("CHYBA pri odesilani: %s\n",http.errorToString(httpCode).c_str());
+  }
+}
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("ESP32 Dad Joke Fetcher");
+  Serial.print("Pripojovaní k Wifi:");
+  Serial.println(ssid);
+  WiFi.begin(ssid,password);
+  while (WiFi.status() != WL_CONNECTED)  {
+    Serial.print(".");
+    delay(300);
+  }
+  Serial.println("WiFi připojena");
+  Serial.print("IP adresa:");
+  Serial.println(WiFi.localIP());  
+}
+
+void loop() {
+  fetchAndPrintDadJoke();
+  Serial.println("\nCekam" + String(fetchInterval/1000)+ "vterin pred stazenim dalsiho vtipu...");
+  delay(fetchInterval);
+}

13_dadjokez/test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html