Update NimBLE_extended_client.ino

Author: Jason2866

examples/arduino-NimBLE-ext_client/src/NimBLE_extended_client.ino

@@ -1,150 +1,40 @@
+/*
+   Based on Neil Kolban example for IDF: https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleScan.cpp
+   Ported to Arduino ESP32 by Evandro Copercini
+*/
 
-/** NimBLE Extended Client Demo:
- *
- *  Demonstrates the Bluetooth 5.x client capabilities.
- *
- *  Created: on April 2 2022
- *      Author: H2zero
- *
- */
+#include <BLEDevice.h>
+#include <BLEUtils.h>
+#include <BLEScan.h>
+#include <BLEAdvertisedDevice.h>
 
-#include <Arduino.h>
-#include <NimBLEDevice.h>
-#if !CONFIG_BT_NIMBLE_EXT_ADV
-# error Must enable extended advertising, see nimconfig.h file.
-#endif
+int scanTime = 5;  //In seconds
+BLEScan *pBLEScan;
 
-#define SERVICE_UUID        "ABCD"
-#define CHARACTERISTIC_UUID "1234"
-
-static const NimBLEAdvertisedDevice* advDevice;
-static bool                          doConnect = false;
-static uint32_t                      scanTime  = 10 * 1000; // In milliseconds, 0 = scan forever
-
-/** Define the PHY's to use when connecting to peer devices, can be 1, 2, or all 3 (default).*/
-static uint8_t connectPhys = BLE_GAP_LE_PHY_CODED_MASK | BLE_GAP_LE_PHY_1M_MASK /*| BLE_GAP_LE_PHY_2M_MASK */;
-
-/** Define a class to handle the callbacks for client connection events */
-class ClientCallbacks : public NimBLEClientCallbacks {
-    void onConnect(NimBLEClient* pClient) override { Serial.printf("Connected\n"); };
-
-    void onDisconnect(NimBLEClient* pClient, int reason) override {
-        Serial.printf("%s Disconnected, reason = %d - Starting scan\n", pClient->getPeerAddress().toString().c_str(), reason);
-        NimBLEDevice::getScan()->start(scanTime);
-    }
-} clientCallbacks;
-
-/** Define a class to handle the callbacks when advertisements are received */
-class scanCallbacks : public NimBLEScanCallbacks {
-    void onResult(const NimBLEAdvertisedDevice* advertisedDevice) override {
-        Serial.printf("Advertised Device found: %s\n", advertisedDevice->toString().c_str());
-        if (advertisedDevice->isAdvertisingService(NimBLEUUID("ABCD"))) {
-            Serial.printf("Found Our Service\n");
-            doConnect = true;
-            /** Save the device reference in a global for the client to use*/
-            advDevice = advertisedDevice;
-            /** stop scan before connecting */
-            NimBLEDevice::getScan()->stop();
-        }
-    }
-
-    /** Callback to process the results of the completed scan or restart it */
-    void onScanEnd(const NimBLEScanResults& results, int rc) override { Serial.printf("Scan Ended\n"); }
-} scanCallbacks;
-
-/** Handles the provisioning of clients and connects / interfaces with the server */
-bool connectToServer() {
-    NimBLEClient* pClient = nullptr;
-
-    pClient = NimBLEDevice::createClient();
-    pClient->setClientCallbacks(&clientCallbacks, false);
-
-    /**
-     * Set the PHY's to use for this connection. This is a bitmask that represents the PHY's:
-     * * 0x01 BLE_GAP_LE_PHY_1M_MASK
-     * * 0x02 BLE_GAP_LE_PHY_2M_MASK
-     * * 0x04 BLE_GAP_LE_PHY_CODED_MASK
-     * Combine these with OR ("|"), eg BLE_GAP_LE_PHY_1M_MASK | BLE_GAP_LE_PHY_2M_MASK | BLE_GAP_LE_PHY_CODED_MASK;
-     */
-    pClient->setConnectPhy(connectPhys);
-
-    /** Set how long we are willing to wait for the connection to complete (milliseconds), default is 30000. */
-    pClient->setConnectTimeout(10 * 1000);
-
-    if (!pClient->connect(advDevice)) {
-        /** Created a client but failed to connect, don't need to keep it as it has no data */
-        NimBLEDevice::deleteClient(pClient);
-        Serial.printf("Failed to connect, deleted client\n");
-        return false;
-    }
-
-    Serial.printf("Connected to: %s RSSI: %d\n", pClient->getPeerAddress().toString().c_str(), pClient->getRssi());
-
-    /** Now we can read/write/subscribe the characteristics of the services we are interested in */
-    NimBLERemoteService*        pSvc = nullptr;
-    NimBLERemoteCharacteristic* pChr = nullptr;
-
-    pSvc = pClient->getService(SERVICE_UUID);
-    if (pSvc) {
-        pChr = pSvc->getCharacteristic(CHARACTERISTIC_UUID);
-        if (pChr) {
-            if (pChr->canRead()) {
-                std::string value = pChr->readValue();
-                Serial.printf("Characteristic value: %s\n", value.c_str());
-            }
-        }
-
-    } else {
-        Serial.printf("ABCD service not found.\n");
-    }
-
-    NimBLEDevice::deleteClient(pClient);
-    Serial.printf("Done with this device!\n");
-    return true;
-}
+class MyAdvertisedDeviceCallbacks : public BLEAdvertisedDeviceCallbacks {
+  void onResult(BLEAdvertisedDevice advertisedDevice) {
+    Serial.printf("Advertised Device: %s \n", advertisedDevice.toString().c_str());
+  }
+};
 
 void setup() {
-    Serial.begin(115200);
-    Serial.printf("Starting NimBLE Client\n");
-
-    /** Initialize NimBLE and set the device name */
-    NimBLEDevice::init("NimBLE Extended Client");
-
-    /** Create aNimBLE Scan instance and set the callbacks for scan events */
-    NimBLEScan* pScan = NimBLEDevice::getScan();
-    pScan->setScanCallbacks(&scanCallbacks);
-
-    /** Set scan interval (how often) and window (how long) in milliseconds */
-    pScan->setInterval(97);
-    pScan->setWindow(67);
-
-    /**
-     * Active scan will gather scan response data from advertisers
-     *  but will use more energy from both devices
-     */
-    pScan->setActiveScan(true);
-
-    /**
-     *  Start scanning for advertisers for the scan time specified (in milliseconds) 0 = forever
-     *  Optional callback for when scanning stops.
-     */
-    pScan->start(scanTime);
-
-    Serial.printf("Scanning for peripherals\n");
+  Serial.begin(115200);
+  Serial.println("Scanning...");
+
+  BLEDevice::init("");
+  pBLEScan = BLEDevice::getScan();  //create new scan
+  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
+  pBLEScan->setActiveScan(true);  //active scan uses more power, but get results faster
+  pBLEScan->setInterval(100);
+  pBLEScan->setWindow(99);  // less or equal setInterval value
 }
 
 void loop() {
-    /** Loop here until we find a device we want to connect to */
-    if (doConnect) {
-        if (connectToServer()) {
-            Serial.printf("Success!, scanning for more!\n");
-        } else {
-            Serial.printf("Failed to connect, starting scan\n");
-        }
-
-        doConnect = false;
-        NimBLEDevice::getScan()->start(scanTime);
-    }
-
-    delay(10);
+  // put your main code here, to run repeatedly:
+  BLEScanResults *foundDevices = pBLEScan->start(scanTime, false);
+  Serial.print("Devices found: ");
+  Serial.println(foundDevices->getCount());
+  Serial.println("Scan done!");
+  pBLEScan->clearResults();  // delete results fromBLEScan buffer to release memory
+  delay(2000);
 }