From f49a7f8a0a9f00d129ac0dad18b3bdfe088a5ae3 Mon Sep 17 00:00:00 2001
From: Adema <h.adema@rug.nl>
Date: Thu, 3 Apr 2025 13:12:38 +0200
Subject: [PATCH] Upload files to "BLE_client_values_record"

---
 .../BLE_client_values_record.ino              | 83 +++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 BLE_client_values_record/BLE_client_values_record.ino

diff --git a/BLE_client_values_record/BLE_client_values_record.ino b/BLE_client_values_record/BLE_client_values_record.ino
new file mode 100644
index 0000000..e810522
--- /dev/null
+++ b/BLE_client_values_record/BLE_client_values_record.ino
@@ -0,0 +1,83 @@
+#include <NimBLEDevice.h>
+
+#define SERVICE_UUID        "12345678-1234-5678-1234-56789abcdef0"
+#define CHARACTERISTIC_UUID "87654321-4321-6789-4321-fedcba987654"
+
+NimBLEClient* pClient = nullptr;
+BLERemoteCharacteristic* pRemoteCharacteristic = nullptr;
+
+// Callback function for receiving notifications
+static void notifyCallback(BLERemoteCharacteristic* pBLERemoteCharacteristic, 
+                           uint8_t* pData, size_t length, bool isNotify) {
+  if (length == 8) {  // Expecting 4x uint16_t (8 bytes total)
+    uint16_t values[4];
+    memcpy(values, pData, sizeof(values));  // Copy received bytes into uint16_t array
+
+    // Send data to PC as CSV format
+    Serial.printf("%d,%d,%d,%d\n", values[0], values[1], values[2], values[3]);
+  } else {
+    Serial.println("Invalid data length!");
+  }
+}
+
+class MyClientCallbacks : public NimBLEClientCallbacks {
+  void onConnect(NimBLEClient* pClient) {
+    Serial.println("Connected to Server!");
+    Serial.printf("Negotiated MTU: %d\n", pClient->getMTU());
+  }
+
+  void onDisconnect(NimBLEClient* pClient) {
+    Serial.println("Disconnected from Server!");
+  }
+};
+
+void connectToServer() {
+  Serial.println("Initializing BLE...");
+  NimBLEDevice::init("");
+
+  pClient = NimBLEDevice::createClient();
+  if (!pClient) {
+    Serial.println("Failed to create client!");
+    return;
+  }
+  pClient->setClientCallbacks(new MyClientCallbacks());
+
+  Serial.println("Connecting to server...");
+
+  // Replace with actual server MAC address
+  NimBLEAddress address(std::string("64:e8:33:85:36:ee"), BLE_ADDR_PUBLIC);
+
+  if (!pClient->connect(address)) {
+    Serial.println("❌ Connection failed!");
+    return;
+  }
+
+  Serial.println("✅ Connected!");
+
+  BLERemoteService* pRemoteService = pClient->getService(SERVICE_UUID);
+  if (!pRemoteService) {
+    Serial.println("❌ Failed to find service!");
+    pClient->disconnect();
+    return;
+  }
+
+  pRemoteCharacteristic = pRemoteService->getCharacteristic(CHARACTERISTIC_UUID);
+  if (!pRemoteCharacteristic) {
+    Serial.println("❌ Failed to find characteristic!");
+    pClient->disconnect();
+    return;
+  }
+
+  Serial.println("✅ Subscribing to notifications...");
+  pRemoteCharacteristic->subscribe(true, notifyCallback);
+}
+
+void setup() {
+  Serial.begin(115200);
+  delay(1000);
+  connectToServer();
+}
+
+void loop() {
+  delay(1000);
+}