Updated Eddystone URL (not complete)

Author: PilnyTomas

libraries/BLE/examples/BLE_EddystoneURL_Beacon/BLE_EddystoneURL_Beacon.ino

@@ -2,6 +2,8 @@
    EddystoneURL beacon by BeeGee
    EddystoneURL frame specification https://github.com/google/eddystone/blob/master/eddystone-url/README.md
 
+   Upgraded on: Feb 20, 2023
+       By: Tomas Pilny
 */
 
 /*
@@ -27,8 +29,17 @@
 
 #include "esp_sleep.h"
 
-#define GPIO_DEEP_SLEEP_DURATION 10     // sleep x seconds and then wake up
-RTC_DATA_ATTR static time_t last;    // remember last boot in RTC Memory
+String URL[] = {"http://www.espressif.com/", // prefix 0x00, suffix 0x00
+                "https://www.texas.gov",     // prefix 0x01, suffix 0x0D
+                "http://en.mapy.cz",         // prefix 0x02, no valid suffix
+                "https://arduino.cc",        // prefix 0x03, no valid suffix
+                "google.com",                // URL without specified prefix - the function will assume default prefix "http://www." = 0x00
+                "diginfo.tv",                // URL without specified prefix - the function will assume default prefix "http://www." = 0x00
+                "http://www.URLsAbove17BytesAreNotAllowed.com", // Too long URL - setSmartURL() will return 0 = ERR
+};
+#define GPIO_DEEP_SLEEP_DURATION 10      // sleep x seconds and then wake up
+#define BEACON_POWER ESP_PWR_LVL_N12
+RTC_DATA_ATTR static time_t last;        // remember last boot in RTC Memory
 RTC_DATA_ATTR static uint32_t bootcount; // remember number of boots in RTC Memory
 
 // See the following for generating UUIDs:
@@ -38,153 +49,57 @@ struct timeval now;
 
 #define BEACON_UUID "8ec76ea3-6668-48da-9866-75be8bc86f4d" // UUID 1 128-Bit (may use linux tool uuidgen or random numbers via https://www.uuidgenerator.net/)
 
-static const char *eddystone_url_prefix_subs[] = {
-  "http://www.",
-  "https://www.",
-  "http://",
-  "https://",
-  "urn:uuid:",
-  NULL
-};
-
-static const char *eddystone_url_suffix_subs[] = {
-  ".com/",
-  ".org/",
-  ".edu/",
-  ".net/",
-  ".info/",
-  ".biz/",
-  ".gov/",
-  ".com",
-  ".org",
-  ".edu",
-  ".net",
-  ".info",
-  ".biz",
-  ".gov",
-  NULL
-};
-
-static int string_begin_with(const char *str, const char *prefix)
-{
-  int prefix_len = strlen(prefix);
-  if (strncmp(prefix, str, prefix_len) == 0)
-  {
-    return prefix_len;
-  }
-  return 0;
-}
-
-void setBeacon()
+int setBeacon()
 {
   BLEAdvertisementData oAdvertisementData = BLEAdvertisementData();
   BLEAdvertisementData oScanResponseData = BLEAdvertisementData();
 
-  const char url[] = "https://d.giesecke.tk";
-
-  int scheme_len, ext_len = 1, i, idx, url_idx;
-  char *ret_data;
-  int url_len = strlen(url);
-
-  ret_data = (char *)calloc(1, url_len + 13);
-
-  ret_data[0] = 2;   // Len
-  ret_data[1] = 0x01;  // Type Flags
-  ret_data[2] = 0x06;  // GENERAL_DISC_MODE 0x02 | BR_EDR_NOT_SUPPORTED 0x04
-  ret_data[3] = 3;   // Len
-  ret_data[4] = 0x03;  // Type 16-Bit UUID
-  ret_data[5] = 0xAA;  // Eddystone UUID 2 -> 0xFEAA LSB
-  ret_data[6] = 0xFE;  // Eddystone UUID 1 MSB
-  ret_data[7] = 19; // Length of Beacon Data
-  ret_data[8] = 0x16;  // Type Service Data
-  ret_data[9] = 0xAA;  // Eddystone UUID 2 -> 0xFEAA LSB
-  ret_data[10] = 0xFE; // Eddystone UUID 1 MSB
-  ret_data[11] = 0x10; // Eddystone Frame Type
-  ret_data[12] = 0xF4; // Beacons TX power at 0m
-
-  i = 0, idx = 13, url_idx = 0;
-
-  //replace prefix
-  scheme_len = 0;
-  while (eddystone_url_prefix_subs[i] != NULL)
-  {
-    if ((scheme_len = string_begin_with(url, eddystone_url_prefix_subs[i])) > 0)
-    {
-      ret_data[idx] = i;
-      idx++;
-      url_idx += scheme_len;
-      break;
-    }
-    i++;
+  BLEEddystoneURL EddystoneURL;
+
+  EddystoneURL.setPower(BEACON_POWER); // This is only information about the power. The actual power is set by `BLEDevice::setPower(BEACON_POWER)`
+  if(EddystoneURL.setSmartURL(URL[bootcount%(sizeof(URL)/sizeof(URL[0]))])){
+    String frame = EddystoneURL.getFrame();
+    std::string data(EddystoneURL.getFrame().c_str(), frame.length());
+    oAdvertisementData.addData(data);
+    oScanResponseData.setName("ESP32 URLBeacon");
+    pAdvertising->setAdvertisementData(oAdvertisementData);
+    pAdvertising->setScanResponseData(oScanResponseData);
+    return 1; // OK
+  }else{
+    Serial.println("Smart URL set ERR");
+    return 0; // ERR
   }
-  while (url_idx < url_len)
-  {
-    i = 0;
-    ret_data[idx] = url[url_idx];
-    ext_len = 1;
-    while (eddystone_url_suffix_subs[i] != NULL)
-    {
-      if ((ext_len = string_begin_with(&url[url_idx], eddystone_url_suffix_subs[i])) > 0)
-      {
-        ret_data[idx] = i;
-        break;
-      }
-      else
-      {
-        ext_len = 1; //inc 1
-      }
-      i++;
-    }
-    url_idx += ext_len;
-    idx++;
-  }
-  ret_data[7] = idx - 8;
-
-  Serial.printf("struct size %d url size %d reported len %d\n",
-                url_len + 13,
-                url_len, ret_data[7]);
-
-  Serial.printf("URL in data %s\n", &ret_data[13]);
-
-  std::string eddyStoneData(ret_data);
-
-  oAdvertisementData.addData(eddyStoneData);
-  oScanResponseData.setName("URLBeacon");
-  pAdvertising->setAdvertisementData(oAdvertisementData);
-  pAdvertising->setScanResponseData(oScanResponseData);
 }
 
 void setup()
 {
-
   Serial.begin(115200);
   gettimeofday(&now, NULL);
 
-  Serial.printf("start ESP32 %lu\n", bootcount++);
-
-  Serial.printf("deep sleep (%llds since last reset, %llds since last boot)\n", now.tv_sec, now.tv_sec - last);
+  Serial.printf("Start ESP32 %lu\n", bootcount++);
+  Serial.printf("Deep sleep (%llds since last reset, %llds since last boot)\n", now.tv_sec, now.tv_sec - last);
 
   last = now.tv_sec;
 
   // Create the BLE Device
   BLEDevice::init("URLBeacon");
-
-  BLEDevice::setPower(ESP_PWR_LVL_N12);
+  BLEDevice::setPower(BEACON_POWER);
 
   // Create the BLE Server
   // BLEServer *pServer = BLEDevice::createServer(); // <-- no longer required to instantiate BLEServer, less flash and ram usage
 
   pAdvertising = BLEDevice::getAdvertising();
 
-  setBeacon();
-  // Start advertising
-  pAdvertising->start();
-  Serial.println("Advertizing started...");
-  delay(10000);
-  pAdvertising->stop();
-  Serial.printf("enter deep sleep\n");
+  if(setBeacon()){
+    // Start advertising
+    pAdvertising->start();
+    Serial.println("Advertising started...");
+    delay(10000);
+    pAdvertising->stop();
+  }
+  Serial.println("Enter deep sleep");
+  bootcount++;
   esp_deep_sleep(1000000LL * GPIO_DEEP_SLEEP_DURATION);
-  Serial.printf("in deep sleep\n");
 }
 
 void loop()