feat: Update FitBot architecture diagrams

code/arduino/bluetoothEsp/bluetoothEsp.ino

@@ -0,0 +1,33 @@
+#include <BLEDevice.h>
+#include <BLEServer.h>
+
+// Define the service UUID
+#define SERVICE_UUID "4fafc201-1fb5-459e-8fcc-c5c9c331914b"
+
+// Define the characteristic UUID
+#define CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8"
+
+void setup() {
+    // Create a BLE server
+    BLEServer *pServer = BLEDevice::createServer();
+
+    // Create a BLE service
+    BLEService *pService = pServer->createService(SERVICE_UUID);
+
+    // Create a BLE characteristic
+    BLECharacteristic *pCharacteristic = pService->createCharacteristic(
+            CHARACTERISTIC_UUID, BLECharacteristic::PROPERTY_READ);
+
+    // Set the characteristic value
+    pCharacteristic->setValue("Hello, Bluetooth!");
+
+    // Start the service
+    pService->start();
+
+    // Start advertising the service
+    pServer->getAdvertising()->start();
+}
+
+void loop() {
+    // Nothing to do here
+}