forked from h2zero/esp-nimble-cpp
Add examples
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h2zero
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examples/basic/BLE_client/main/main.cpp
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examples/basic/BLE_client/main/main.cpp
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/**
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* A BLE client example that is rich in capabilities.
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* There is a lot new capabilities implemented.
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* author unknown
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* updated by chegewara
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* updated for NimBLE by H2zero
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*/
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/** NimBLE differences highlighted in comment blocks **/
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/*******original********
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#include "BLEDevice.h"
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***********************/
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#include "NimBLEDevice.h"
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extern "C"{void app_main(void);}
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// The remote service we wish to connect to.
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static BLEUUID serviceUUID("4fafc201-1fb5-459e-8fcc-c5c9c331914b");
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// The characteristic of the remote service we are interested in.
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static BLEUUID charUUID("beb5483e-36e1-4688-b7f5-ea07361b26a8");
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static bool doConnect = false;
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static bool connected = false;
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static bool doScan = false;
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static BLERemoteCharacteristic* pRemoteCharacteristic;
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static BLEAdvertisedDevice* myDevice;
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static void notifyCallback(
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BLERemoteCharacteristic* pBLERemoteCharacteristic,
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uint8_t* pData,
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size_t length,
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bool isNotify) {
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printf("Notify callback for characteristic %s of data length %d data: %s\n",
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pBLERemoteCharacteristic->getUUID().toString().c_str(),
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length,
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(char*)pData);
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}
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/** None of these are required as they will be handled by the library with defaults. **
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** Remove as you see fit for your needs */
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class MyClientCallback : public BLEClientCallbacks {
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void onConnect(BLEClient* pclient) {
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}
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void onDisconnect(BLEClient* pclient) {
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connected = false;
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printf("onDisconnect");
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}
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/***************** New - Security handled here ********************
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****** Note: these are the same return values as defaults ********/
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uint32_t onPassKeyRequest(){
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printf("Client PassKeyRequest\n");
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return 123456;
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}
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bool onConfirmPIN(uint32_t pass_key){
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printf("The passkey YES/NO number: %d\n", pass_key);
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return true;
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}
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void onAuthenticationComplete(ble_gap_conn_desc desc){
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printf("Starting BLE work!\n");
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}
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/*******************************************************************/
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};
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bool connectToServer() {
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printf("Forming a connection to %s\n", myDevice->getAddress().toString().c_str());
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BLEClient* pClient = BLEDevice::createClient();
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printf(" - Created client\n");
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pClient->setClientCallbacks(new MyClientCallback());
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// Connect to the remove BLE Server.
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pClient->connect(myDevice); // if you pass BLEAdvertisedDevice instead of address, it will be recognized type of peer device address (public or private)
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printf(" - Connected to server\n");
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// Obtain a reference to the service we are after in the remote BLE server.
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BLERemoteService* pRemoteService = pClient->getService(serviceUUID);
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if (pRemoteService == nullptr) {
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printf("Failed to find our service UUID: %s\n", serviceUUID.toString().c_str());
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pClient->disconnect();
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return false;
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}
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printf(" - Found our service\n");
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// Obtain a reference to the characteristic in the service of the remote BLE server.
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pRemoteCharacteristic = pRemoteService->getCharacteristic(charUUID);
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if (pRemoteCharacteristic == nullptr) {
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printf("Failed to find our characteristic UUID: %s\n", charUUID.toString().c_str());
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pClient->disconnect();
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return false;
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}
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printf(" - Found our characteristic\n");
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// Read the value of the characteristic.
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if(pRemoteCharacteristic->canRead()) {
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std::string value = pRemoteCharacteristic->readValue();
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printf("The characteristic value was: %s\n", value.c_str());
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}
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/** registerForNotify() has been deprecated and replaced with subscribe() / unsubscribe().
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* Subscribe parameter defaults are: notifications=true, notifyCallback=nullptr, response=false.
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* Unsubscribe parameter defaults are: response=false.
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*/
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if(pRemoteCharacteristic->canNotify()) {
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//pRemoteCharacteristic->registerForNotify(notifyCallback);
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pRemoteCharacteristic->subscribe(true, notifyCallback);
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}
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connected = true;
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return true;
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}
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/**
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* Scan for BLE servers and find the first one that advertises the service we are looking for.
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*/
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class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
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/**
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* Called for each advertising BLE server.
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*/
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/*** Only a reference to the advertised device is passed now
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void onResult(BLEAdvertisedDevice advertisedDevice) { **/
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void onResult(BLEAdvertisedDevice* advertisedDevice) {
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printf("BLE Advertised Device found: %s\n", advertisedDevice->toString().c_str());
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// We have found a device, let us now see if it contains the service we are looking for.
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/********************************************************************************
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if (advertisedDevice.haveServiceUUID() && advertisedDevice.isAdvertisingService(serviceUUID)) {
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********************************************************************************/
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if (advertisedDevice->haveServiceUUID() && advertisedDevice->isAdvertisingService(serviceUUID)) {
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BLEDevice::getScan()->stop();
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/*******************************************************************
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myDevice = new BLEAdvertisedDevice(advertisedDevice);
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*******************************************************************/
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myDevice = advertisedDevice; /** Just save the reference now, no need to copy the object */
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doConnect = true;
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doScan = true;
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} // Found our server
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} // onResult
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}; // MyAdvertisedDeviceCallbacks
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// This is the Arduino main loop function.
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void connectTask (void * parameter){
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for(;;) {
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// If the flag "doConnect" is true then we have scanned for and found the desired
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// BLE Server with which we wish to connect. Now we connect to it. Once we are
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// connected we set the connected flag to be true.
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if (doConnect == true) {
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if (connectToServer()) {
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printf("We are now connected to the BLE Server.\n");
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} else {
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printf("We have failed to connect to the server; there is nothin more we will do.\n");
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}
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doConnect = false;
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}
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// If we are connected to a peer BLE Server, update the characteristic each time we are reached
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// with the current time since boot.
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if (connected) {
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char buf[256];
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snprintf(buf, 256, "Time since boot: %lu", (unsigned long)(esp_timer_get_time() / 1000000ULL));
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printf("Setting new characteristic value to %s\n", buf);
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// Set the characteristic's value to be the array of bytes that is actually a string.
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/*** Note: write value now returns true if successful, false otherwise - try again or disconnect ***/
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pRemoteCharacteristic->writeValue((uint8_t*)buf, strlen(buf), false);
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}else if(doScan){
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BLEDevice::getScan()->start(0); // this is just eample to start scan after disconnect, most likely there is better way to do it in arduino
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}
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vTaskDelay(1000/portTICK_PERIOD_MS); // Delay a second between loops.
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}
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vTaskDelete(NULL);
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} // End of loop
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void app_main(void) {
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printf("Starting BLE Client application...\n");
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BLEDevice::init("");
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// Retrieve a Scanner and set the callback we want to use to be informed when we
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// have detected a new device. Specify that we want active scanning and start the
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// scan to run for 5 seconds.
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BLEScan* pBLEScan = BLEDevice::getScan();
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pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
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pBLEScan->setInterval(1349);
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pBLEScan->setWindow(449);
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pBLEScan->setActiveScan(true);
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xTaskCreate(connectTask, "connectTask", 5000, NULL, 1, NULL);
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pBLEScan->start(5, false);
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} // End of setup.
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