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2151386057
* General code cleanup * `NimBLEScan::start` will no longer clear cache or results if scanning is already in progress. * `NimBLEScan::clearResults` will now reset the vector capacity to 0. * `NimBLEScan::stop` will no longer call the `onScanEnd` callback as the caller should know its been stopped when this is called. * `NimBLEScan::clearDuplicateCache` has been removed as it was problematic and only for the esp32. Stop and start the scanner for the same effect. * `NimBLEScan::start` takes a new bool parameter `restart`, default `true`, that will restart an already in progress scan and clear the duplicate filter so all devices will be discovered again. * Scan response data that is received without advertisement first will now create the device and send a callback. * Added new method: `NimBLEAdvertisedDevice::isScannable()` that returns true if the device is scannable. * Added default callbacks for `NimBLEScanCallbacks` * `NimBLEScanCallbacks` function signatures updated: * - `onDiscovered` now takes a `const NimBLEAdvertisedDevice*` * - `onResult` now takes a `const NimBLEAdvertisedDevice*` * - `onScanEnd` now takes a `const NimBLEScanResults&` and `int reason` * Added new erase overload: `NimBLEScan::erase(const NimBLEAdvertisedDevice* device)` * `NimBLEScanResults::getDevice` methods now return `const NimBLEAdvertisedDevice*` * `NimBLEScanResults` iterators are now `const_iterator`
45 lines
No EOL
2.2 KiB
C++
45 lines
No EOL
2.2 KiB
C++
/**
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* Continuous Scan Example
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*
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* This example demonstrates how to continuously scan for BLE devices.
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* When devices are found the onDiscovered and onResults callbacks will be called with the device data.
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* The scan will not store the results, only the callbacks will be used
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* When the scan timeout is reached the onScanEnd callback will be called and the scan will be restarted.
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* This will clear the duplicate cache in the controller and allow the same devices to be reported again.
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*
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* Created: on March 24 2020
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* Author: H2zero
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*
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*/
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#include "NimBLEDevice.h"
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static constexpr uint32_t scanTime = 30 * 1000; // 30 seconds scan time.
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class scanCallbacks : public NimBLEScanCallbacks {
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// Initial discovery, advertisement data only.
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void onDiscovered(const NimBLEAdvertisedDevice* advertisedDevice) override {
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printf("Discovered Device: %s\n", advertisedDevice->toString().c_str());
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}
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// If active scanning the result here will have the scan response data.
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// If not active scanning then this will be the same as onDiscovered.
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void onResult(const NimBLEAdvertisedDevice* advertisedDevice) override {
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printf("Device result: %s\n", advertisedDevice->toString().c_str());
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}
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void onScanEnd(const NimBLEScanResults& results, int reason) override {
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printf("Scan ended reason = %d; restarting scan\n", reason);
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NimBLEDevice::getScan()->start(scanTime, false, true);
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}
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} scanCallbacks; // create a callback class instance.
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extern "C" void app_main() {
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NimBLEDevice::init(""); // Initialize the device, you can specify a device name if you want.
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NimBLEScan* pBLEScan = NimBLEDevice::getScan(); // Create the scan object.
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pBLEScan->setScanCallbacks(&scanCallbacks, false); // Set the callback for when devices are discovered, no duplicates.
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pBLEScan->setActiveScan(true); // Set active scanning, this will get more data from the advertiser.
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pBLEScan->setMaxResults(0); // Do not store the scan results, use callback only.
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pBLEScan->start(scanTime, false, true); // duration, not a continuation of last scan, restart to get all devices again.
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printf("Scanning...\n");
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} |