From e9ca4ff58f565f9c3f751c22326280d9f4512a8f Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Tue, 25 Feb 2025 20:36:27 +0100
Subject: add iBeacon example code

---
 _mussel1.c | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 _mussel1.c

diff --git a/_mussel1.c b/_mussel1.c
new file mode 100644
index 0000000..d5db613
--- /dev/null
+++ b/_mussel1.c
@@ -0,0 +1,133 @@
+/*
+   Based on 31337Ghost's reference code from https://github.com/nkolban/esp32-snippets/issues/385#issuecomment-362535434
+   which is based on pcbreflux's Arduino ESP32 port of Neil Kolban's example for IDF: https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleScan.cpp
+*/
+
+/*
+   Create a BLE server that will send periodic iBeacon frames.
+   The design of creating the BLE server is:
+   1. Create a BLE Server
+   2. Create advertising data
+   3. Start advertising.
+   4. wait
+   5. Stop advertising.
+*/
+#include <BLEDevice.h>
+#include <BLEServer.h>
+#include <BLEUtils.h>
+#include <BLE2902.h>
+#include <BLEBeacon.h>
+
+#define DEVICE_NAME         "ESP32"
+#define SERVICE_UUID        "7A0247E7-8E88-409B-A959-AB5092DDB03E"
+#define BEACON_UUID         "2D7A9F0C-E0E8-4CC9-A71B-A21DB2D034A1"
+#define BEACON_UUID_REV     "A134D0B2-1DA2-1BA7-C94C-E8E00C9F7A2D"
+#define CHARACTERISTIC_UUID "82258BAA-DF72-47E8-99BC-B73D7ECD08A5"
+
+BLEServer *pServer;
+BLECharacteristic *pCharacteristic;
+bool deviceConnected = false;
+uint8_t value = 0;
+
+class MyServerCallbacks : public BLEServerCallbacks {
+  void onConnect(BLEServer *pServer) {
+    deviceConnected = true;
+    Serial.println("deviceConnected = true");
+  };
+
+  void onDisconnect(BLEServer *pServer) {
+    deviceConnected = false;
+    Serial.println("deviceConnected = false");
+
+    // Restart advertising to be visible and connectable again
+    BLEAdvertising *pAdvertising;
+    pAdvertising = pServer->getAdvertising();
+    pAdvertising->start();
+    Serial.println("iBeacon advertising restarted");
+  }
+};
+
+class MyCallbacks : public BLECharacteristicCallbacks {
+  void onWrite(BLECharacteristic *pCharacteristic) {
+    String rxValue = pCharacteristic->getValue();
+
+    if (rxValue.length() > 0) {
+      Serial.println("*********");
+      Serial.print("Received Value: ");
+      for (int i = 0; i < rxValue.length(); i++) {
+        Serial.print(rxValue[i]);
+      }
+      Serial.println();
+      Serial.println("*********");
+    }
+  }
+};
+
+void init_service() {
+  BLEAdvertising *pAdvertising;
+  pAdvertising = pServer->getAdvertising();
+  pAdvertising->stop();
+
+  // Create the BLE Service
+  BLEService *pService = pServer->createService(BLEUUID(SERVICE_UUID));
+
+  // Create a BLE Characteristic
+  pCharacteristic = pService->createCharacteristic(
+    CHARACTERISTIC_UUID, BLECharacteristic::PROPERTY_READ | BLECharacteristic::PROPERTY_WRITE | BLECharacteristic::PROPERTY_NOTIFY
+  );
+  pCharacteristic->setCallbacks(new MyCallbacks());
+  pCharacteristic->addDescriptor(new BLE2902());
+
+  pAdvertising->addServiceUUID(BLEUUID(SERVICE_UUID));
+
+  // Start the service
+  pService->start();
+
+  pAdvertising->start();
+}
+
+void init_beacon() {
+  BLEAdvertising *pAdvertising;
+  pAdvertising = pServer->getAdvertising();
+  pAdvertising->stop();
+  // iBeacon
+  BLEBeacon myBeacon;
+  myBeacon.setManufacturerId(0x4c00);
+  myBeacon.setMajor(5);
+  myBeacon.setMinor(88);
+  myBeacon.setSignalPower(0xc5);
+  myBeacon.setProximityUUID(BLEUUID(BEACON_UUID_REV));
+
+  BLEAdvertisementData advertisementData;
+  advertisementData.setFlags(0x1A);
+  advertisementData.setManufacturerData(myBeacon.getData());
+  pAdvertising->setAdvertisementData(advertisementData);
+
+  pAdvertising->start();
+}
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println();
+  Serial.println("Initializing...");
+  Serial.flush();
+
+  BLEDevice::init(DEVICE_NAME);
+  pServer = BLEDevice::createServer();
+  pServer->setCallbacks(new MyServerCallbacks());
+
+  init_service();
+  init_beacon();
+
+  Serial.println("iBeacon + service defined and advertising!");
+}
+
+void loop() {
+  if (deviceConnected) {
+    Serial.printf("*** NOTIFY: %d ***\n", value);
+    pCharacteristic->setValue(&value, 1);
+    pCharacteristic->notify();
+    value++;
+  }
+  delay(2000);
+}
-- 
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