1  // SPDX-FileCopyrightText: 2017 Evandro Copercini
  2  //
  3  // SPDX-License-Identifier: Apache-2.0
  4  
  5  /*
  6    Wifi secure connection example for ESP32
  7    Running on TLS 1.2 using mbedTLS
  8    2017 - Evandro Copercini - Apache 2.0 License.
  9  */
 10  
 11  #include <WiFiClientSecure.h>
 12  #include <ArduinoJson.h>
 13  #include "Adafruit_ThinkInk.h"
 14  #include "Adafruit_NeoPixel.h"
 15  #include <Fonts/FreeSans9pt7b.h>
 16  
 17  const char* ssid     = "adafruit";     // your network SSID (name of wifi network)
 18  const char* password = "ffffffff"; // your network password
 19  
 20  const char*  server = "www.adafruit.com";
 21  const char*  path   = "/api/quotes.php";
 22  
 23  WiFiClientSecure client;
 24  ThinkInk_290_Grayscale4_T5 display(EPD_DC, EPD_RESET, EPD_CS, -1, -1);
 25  Adafruit_NeoPixel intneo = Adafruit_NeoPixel(4, PIN_NEOPIXEL, NEO_GRB + NEO_KHZ800);
 26  
 27  
 28  void deepSleep() {
 29    pinMode(NEOPIXEL_POWER, OUTPUT);
 30    pinMode(SPEAKER_SHUTDOWN, OUTPUT);
 31    digitalWrite(SPEAKER_SHUTDOWN, LOW); // off
 32    digitalWrite(NEOPIXEL_POWER, HIGH); // off
 33    digitalWrite(EPD_RESET, LOW); // off (yes required to save a few mA)
 34    pinMode(13, OUTPUT);
 35    digitalWrite(13, LOW);
 36  
 37    esp_sleep_enable_timer_wakeup(60 * 1000000); // 60 seconds
 38    esp_deep_sleep_start();  
 39  }
 40  
 41  void setup() {
 42    //Initialize serial and wait for port to open:
 43    Serial.begin(115200);
 44    //while (!Serial) delay(10);
 45  
 46    pinMode(BUTTON_A, INPUT_PULLUP);
 47    pinMode(BUTTON_B, INPUT_PULLUP);
 48    pinMode(BUTTON_C, INPUT_PULLUP);
 49    pinMode(BUTTON_D, INPUT_PULLUP);
 50    pinMode(EPD_BUSY, INPUT);
 51    pinMode(13, OUTPUT);
 52    digitalWrite(13, HIGH);
 53  
 54    
 55    display.begin(THINKINK_GRAYSCALE4);
 56  
 57    Serial.print("Attempting to connect to SSID: ");
 58    Serial.println(ssid);
 59  
 60    display.clearBuffer();
 61    display.setFont(&FreeSans9pt7b);
 62    display.setTextSize(1);
 63    display.setTextColor(EPD_BLACK);
 64    display.setCursor(10, 30);
 65    display.print("Connecting to SSID ");
 66    display.println(ssid);
 67    display.display();
 68    
 69    WiFi.begin(ssid, password);
 70  
 71    // attempt to connect to Wifi network:
 72    while (WiFi.status() != WL_CONNECTED) {
 73      Serial.print(".");
 74      delay(100);
 75    }
 76  
 77    Serial.print("Connected to ");
 78    Serial.println(ssid);
 79  
 80    //client.setCACert(test_root_ca);
 81    //client.setCertificate(test_client_key); // for client verification
 82    //client.setPrivateKey(test_client_cert);	// for client verification
 83  
 84  // Neopixel power
 85    pinMode(NEOPIXEL_POWER, OUTPUT);
 86    digitalWrite(NEOPIXEL_POWER, LOW); // on
 87    intneo.fill(25, 0, 0);
 88    intneo.show();
 89    
 90    Serial.println("\nStarting connection to server...");
 91    client.setInsecure();
 92    if (!client.connect(server, 443)) {
 93      Serial.println("Connection failed!");
 94      deepSleep();
 95    }
 96  
 97    intneo.fill(25, 25, 0);
 98    intneo.show();
 99    
100    Serial.println("Connected to server!");
101    // Make a HTTP request:
102    client.print("GET "); client.print(path); client.println(" HTTP/1.1");
103    client.print("Host: "); client.println(server);
104    client.println("Connection: close");
105    client.println();
106  
107    // Check HTTP status
108    char status[32] = {0};
109    client.readBytesUntil('\r', status, sizeof(status));
110    if (strcmp(status, "HTTP/1.1 200 OK") != 0) {
111      Serial.print(F("Unexpected response: "));
112      Serial.println(status);
113      deepSleep();
114    }
115  
116    intneo.fill(0, 25, 0);
117    intneo.show();
118    while (client.connected()) {
119      String line = client.readStringUntil('\n');
120      if (line == "\r") {
121        Serial.println("headers received");
122        break;
123      }
124    }
125  
126    intneo.fill(0, 25, 25);
127    intneo.show();
128    while (client.peek() != '[') {
129      client.read();
130    }
131  
132    intneo.fill(0, 0, 25);
133    intneo.show();
134      
135    // Allocate the JSON document
136    // Use arduinojson.org/v6/assistant to compute the capacity.
137    const size_t capacity = JSON_ARRAY_SIZE(1) + JSON_OBJECT_SIZE(8) + 200;
138    DynamicJsonDocument doc(capacity);
139  
140    // Parse JSON object
141    DeserializationError error = deserializeJson(doc, client);
142    if (error) {
143      Serial.print(F("deserializeJson() failed: "));
144      Serial.println(error.c_str());
145      deepSleep();
146    }
147  
148    intneo.fill(0, 25, 25);
149    intneo.show();
150    
151    // Extract values
152    JsonObject root_0 = doc[0];
153    Serial.println(F("Response:"));
154    const char* root_0_text = root_0["text"];
155    const char* root_0_author = root_0["author"];
156  
157    Serial.print("Quote: "); Serial.println(root_0_text);
158    Serial.print("Author: "); Serial.println(root_0_author);
159  
160    display.clearBuffer();
161    display.setFont(&FreeSans9pt7b);
162    display.setTextSize(1);
163    display.setTextWrap(true);
164    display.setTextColor(EPD_BLACK);
165    display.setCursor(10, 30);
166    display.println(root_0_text);
167    display.setTextColor(EPD_DARK);
168    display.setCursor(40, 120);
169    display.println(root_0_author);
170    display.display();
171    while (!digitalRead(EPD_BUSY)) {
172      delay(10);
173    }
174  
175    while (client.available() > 0)
176    {
177      //read back one line from the server
178      String line = client.readStringUntil('\r');
179      Serial.println(line);
180    }
181    
182    // disconnect
183    client.stop();
184    deepSleep();
185  }
186  
187  void loop() {
188  
189  }