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lib/NimBLE-Arduino/examples/NimBLE_Scan_Continuous/NimBLE_Scan_Continuous.ino

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+/** Example of continuous scanning for BLE advertisements.
+ * This example will scan forever while consuming as few resources as possible
+ * and report all advertisments on the serial monitor.
+ *
+ * Created: on January 31 2021
+ *      Author: H2zero
+ *
+ */
+
+#include "NimBLEDevice.h"
+
+NimBLEScan* pBLEScan;
+
+class MyAdvertisedDeviceCallbacks: public NimBLEAdvertisedDeviceCallbacks {
+    void onResult(NimBLEAdvertisedDevice* advertisedDevice) {
+      Serial.printf("Advertised Device: %s \n", advertisedDevice->toString().c_str());
+    }
+};
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("Scanning...");
+
+/** *Optional* Sets the filtering mode used by the scanner in the BLE controller.
+ *
+ *  Can be one of:
+ *  CONFIG_BTDM_SCAN_DUPL_TYPE_DEVICE (0) (default)
+ *  Filter by device address only, advertisements from the same address will be reported only once.
+ *
+ *  CONFIG_BTDM_SCAN_DUPL_TYPE_DATA (1)
+ *  Filter by data only, advertisements with the same data will only be reported once,
+ *  even from different addresses.
+ *
+ *  CONFIG_BTDM_SCAN_DUPL_TYPE_DATA_DEVICE (2)
+ *  Filter by address and data, advertisements from the same address will be reported only once,
+ *  except if the data in the advertisement has changed, then it will be reported again.
+ *
+ *  Can only be used BEFORE calling NimBLEDevice::init.
+*/
+  NimBLEDevice::setScanFilterMode(CONFIG_BTDM_SCAN_DUPL_TYPE_DEVICE);
+
+/** *Optional* Sets the scan filter cache size in the BLE controller.
+ *  When the number of duplicate advertisements seen by the controller
+ *  reaches this value it will clear the cache and start reporting previously
+ *  seen devices. The larger this number, the longer time between repeated
+ *  device reports. Range 10 - 1000. (default 20)
+ *
+ *  Can only be used BEFORE calling NimBLEDevice::init.
+ */
+  NimBLEDevice::setScanDuplicateCacheSize(200);
+
+  NimBLEDevice::init("");
+
+  pBLEScan = NimBLEDevice::getScan(); //create new scan
+  // Set the callback for when devices are discovered, no duplicates.
+  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks(), false);
+  pBLEScan->setActiveScan(true); // Set active scanning, this will get more data from the advertiser.
+  pBLEScan->setInterval(97); // How often the scan occurs / switches channels; in milliseconds,
+  pBLEScan->setWindow(37);  // How long to scan during the interval; in milliseconds.
+  pBLEScan->setMaxResults(0); // do not store the scan results, use callback only.
+}
+
+void loop() {
+  // If an error occurs that stops the scan, it will be restarted here.
+  if(pBLEScan->isScanning() == false) {
+      // Start scan with: duration = 0 seconds(forever), no scan end callback, not a continuation of a previous scan.
+      pBLEScan->start(0, nullptr, false);
+  }
+
+  delay(2000);
+}