mirror of
https://github.com/h2zero/esp-nimble-cpp.git
synced 2024-12-22 11:00:47 +01:00
144 lines
5.1 KiB
C++
144 lines
5.1 KiB
C++
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/**
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* NimBLE Extended Client Demo:
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*
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* Demonstrates the Bluetooth 5.x client capabilities.
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*
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* Created: on April 2 2022
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* Author: H2zero
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*/
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#include <NimBLEDevice.h>
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#define SERVICE_UUID "ABCD"
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#define CHARACTERISTIC_UUID "1234"
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static const NimBLEAdvertisedDevice* advDevice;
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static bool doConnect = false;
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static uint32_t scanTimeMs = 10 * 1000; // In milliseconds, 0 = scan forever
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/** Define the PHY's to use when connecting to peer devices, can be 1, 2, or all 3 (default).*/
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static uint8_t connectPhys = BLE_GAP_LE_PHY_CODED_MASK | BLE_GAP_LE_PHY_1M_MASK /*| BLE_GAP_LE_PHY_2M_MASK */;
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/** Define a class to handle the callbacks for client connection events */
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class ClientCallbacks : public NimBLEClientCallbacks {
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void onConnect(NimBLEClient* pClient) override { printf("Connected\n"); };
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void onDisconnect(NimBLEClient* pClient, int reason) override {
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printf("%s Disconnected, reason = %d - Starting scan\n", pClient->getPeerAddress().toString().c_str(), reason);
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NimBLEDevice::getScan()->start(scanTimeMs);
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}
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} clientCallbacks;
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/** Define a class to handle the callbacks when advertisements are received */
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class scanCallbacks : public NimBLEScanCallbacks {
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void onResult(const NimBLEAdvertisedDevice* advertisedDevice) override {
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printf("Advertised Device found: %s\n", advertisedDevice->toString().c_str());
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if (advertisedDevice->isAdvertisingService(NimBLEUUID("ABCD"))) {
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printf("Found Our Service\n");
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doConnect = true;
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/** Save the device reference in a global for the client to use*/
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advDevice = advertisedDevice;
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/** stop scan before connecting */
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NimBLEDevice::getScan()->stop();
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}
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}
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/** Callback to process the results of the completed scan or restart it */
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void onScanEnd(const NimBLEScanResults& results, int rc) override { printf("Scan Ended\n"); }
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} scanCallbacks;
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/** Handles the provisioning of clients and connects / interfaces with the server */
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bool connectToServer() {
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NimBLEClient* pClient = nullptr;
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pClient = NimBLEDevice::createClient();
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pClient->setClientCallbacks(&clientCallbacks, false);
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/**
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* Set the PHY's to use for this connection. This is a bitmask that represents the PHY's:
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* * 0x01 BLE_GAP_LE_PHY_1M_MASK
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* * 0x02 BLE_GAP_LE_PHY_2M_MASK
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* * 0x04 BLE_GAP_LE_PHY_CODED_MASK
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* Combine these with OR ("|"), eg BLE_GAP_LE_PHY_1M_MASK | BLE_GAP_LE_PHY_2M_MASK | BLE_GAP_LE_PHY_CODED_MASK;
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*/
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pClient->setConnectPhy(connectPhys);
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/** Set how long we are willing to wait for the connection to complete (milliseconds), default is 30000. */
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pClient->setConnectTimeout(10 * 1000);
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if (!pClient->connect(advDevice)) {
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/** Created a client but failed to connect, don't need to keep it as it has no data */
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NimBLEDevice::deleteClient(pClient);
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printf("Failed to connect, deleted client\n");
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return false;
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}
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printf("Connected to: %s RSSI: %d\n", pClient->getPeerAddress().toString().c_str(), pClient->getRssi());
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/** Now we can read/write/subscribe the characteristics of the services we are interested in */
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NimBLERemoteService* pSvc = nullptr;
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NimBLERemoteCharacteristic* pChr = nullptr;
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pSvc = pClient->getService(SERVICE_UUID);
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if (pSvc) {
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pChr = pSvc->getCharacteristic(CHARACTERISTIC_UUID);
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if (pChr) {
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if (pChr->canRead()) {
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std::string value = pChr->readValue();
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printf("Characteristic value: %s\n", value.c_str());
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}
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}
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} else {
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printf("ABCD service not found.\n");
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}
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NimBLEDevice::deleteClient(pClient);
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printf("Done with this device!\n");
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return true;
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}
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extern "C" void app_main(void) {
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printf("Starting NimBLE Client\n");
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/** Initialize NimBLE and set the device name */
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NimBLEDevice::init("NimBLE Extended Client");
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/** Create aNimBLE Scan instance and set the callbacks for scan events */
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NimBLEScan* pScan = NimBLEDevice::getScan();
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pScan->setScanCallbacks(&scanCallbacks);
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/** Set scan interval (how often) and window (how long) in milliseconds */
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pScan->setInterval(97);
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pScan->setWindow(67);
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/**
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* Active scan will gather scan response data from advertisers
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* but will use more energy from both devices
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*/
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pScan->setActiveScan(true);
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/**
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* Start scanning for advertisers for the scan time specified (in milliseconds) 0 = forever
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* Optional callback for when scanning stops.
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*/
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pScan->start(scanTimeMs);
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printf("Scanning for peripherals\n");
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/** Loop here until we find a device we want to connect to */
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for (;;) {
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if (doConnect) {
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if (connectToServer()) {
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printf("Success!, scanning for more!\n");
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} else {
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printf("Failed to connect, starting scan\n");
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}
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doConnect = false;
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NimBLEDevice::getScan()->start(scanTimeMs);
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}
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vTaskDelay(pdMS_TO_TICKS(10));
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}
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}
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