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/** NimBLE_Server Demo:
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*
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* Demonstrates many of the available features of the NimBLE client library.
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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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void scanEndedCB(NimBLEScanResults results);
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static NimBLEAdvertisedDevice* advDevice=nullptr;
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static bool doConnect = false;
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static uint32_t scanTime = 0; /** 0 = scan forever */
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static NimBLEClient* BTClient=nullptr;
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NimBLERemoteCharacteristic* BTChr = nullptr;
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/** Define a class to handle the callbacks when advertisments are received */
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class AdvertisedDeviceCallbacks: public NimBLEAdvertisedDeviceCallbacks {
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void onResult(NimBLEAdvertisedDevice* advertisedDevice) {
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// Serial.print("Advertised Device found: ");
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// Serial.println(advertisedDevice->toString().c_str());
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if(advertisedDevice->isAdvertisingService(NimBLEUUID("DEAD")))
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{
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// Serial.println("Found Our Service");
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/** stop scan before connecting */
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NimBLEDevice::getScan()->stop();
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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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/** Ready to connect now */
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doConnect = true;
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}
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};
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};
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/** Callback to process the results of the last scan or restart it */
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void scanEndedCB(NimBLEScanResults results){
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// Serial.println("Scan Ended");
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}
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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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/** Check if we have a client we should reuse first **/
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if(NimBLEDevice::getClientListSize()) {
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/** Special case when we already know this device, we send false as the
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* second argument in connect() to prevent refreshing the service database.
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* This saves considerable time and power.
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*/
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pClient = NimBLEDevice::getClientByPeerAddress(advDevice->getAddress());
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if(pClient){
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if(!pClient->connect(advDevice, false)) {
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// Serial.println("Reconnect failed");
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return false;
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}
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// Serial.println("Reconnected client");
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}
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/** We don't already have a client that knows this device,
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* we will check for a client that is disconnected that we can use.
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*/
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else {
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pClient = NimBLEDevice::getDisconnectedClient();
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}
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}
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/** No client to reuse? Create a new one. */
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if(!pClient) {
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if(NimBLEDevice::getClientListSize() >= NIMBLE_MAX_CONNECTIONS) {
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// Serial.println("Max clients reached - no more connections available");
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return false;
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}
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pClient = NimBLEDevice::createClient();
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// Serial.println("New client created");
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// pClient->setClientCallbacks(&clientCB, false);
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/** Set initial connection parameters: These settings are 15ms interval, 0 latency, 120ms timout.
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* These settings are safe for 3 clients to connect reliably, can go faster if you have less
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* connections. Timeout should be a multiple of the interval, minimum is 100ms.
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* Min interval: 12 * 1.25ms = 15, Max interval: 12 * 1.25ms = 15, 0 latency, 51 * 10ms = 510ms timeout
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*/
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pClient->setConnectionParams(12,12,0,51);
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/** Set how long we are willing to wait for the connection to complete (seconds), default is 30. */
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pClient->setConnectTimeout(5);
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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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// Serial.println("Failed to connect, deleted client");
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return false;
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}
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}
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if(!pClient->isConnected()) {
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if (!pClient->connect(advDevice)) {
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// Serial.println("Failed to connect");
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return false;
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}
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}
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// Serial.print("Connected to: ");
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// Serial.println(pClient->getPeerAddress().toString().c_str());
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// Serial.print("RSSI: ");
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// Serial.println(pClient->getRssi());
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/** Now we can read/write/subscribe the charateristics 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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NimBLERemoteDescriptor* pDsc = nullptr;
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BTClient = NimBLEDevice::getClientByPeerAddress(advDevice->getAddress());
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pSvc = pClient->getService("DEAD");
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if(pSvc) { /** make sure it's not null */
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pChr = pSvc->getCharacteristic("BEEF");
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BTChr = pSvc->getCharacteristic("BEEF");
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if(pChr) { /** make sure it's not null */
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if(pChr->canRead()) {
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// Serial.print(pChr->getUUID().toString().c_str());
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// Serial.print(" Value: ");
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// Serial.println(pChr->readValue().c_str());
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}
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}
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} else {
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// Serial.println("DEAD service not found.");
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}
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// Serial.println("Done with this device!");
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return true;
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}
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void setup (){
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Serial.begin(115200);
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// Serial.println("Starting NimBLE Client");
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/** Initialize NimBLE, no device name spcified as we are not advertising */
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NimBLEDevice::init("");
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/** Set the IO capabilities of the device, each option will trigger a different pairing method.
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* BLE_HS_IO_KEYBOARD_ONLY - Passkey pairing
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* BLE_HS_IO_DISPLAY_YESNO - Numeric comparison pairing
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* BLE_HS_IO_NO_INPUT_OUTPUT - DEFAULT setting - just works pairing
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*/
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//NimBLEDevice::setSecurityIOCap(BLE_HS_IO_KEYBOARD_ONLY); // use passkey
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//NimBLEDevice::setSecurityIOCap(BLE_HS_IO_DISPLAY_YESNO); //use numeric comparison
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/** 2 different ways to set security - both calls achieve the same result.
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* no bonding, no man in the middle protection, secure connections.
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*
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* These are the default values, only shown here for demonstration.
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*/
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//NimBLEDevice::setSecurityAuth(false, false, true);
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NimBLEDevice::setSecurityAuth(/*BLE_SM_PAIR_AUTHREQ_BOND | BLE_SM_PAIR_AUTHREQ_MITM |*/ BLE_SM_PAIR_AUTHREQ_SC);
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/** Optional: set the transmit power, default is 3db */
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NimBLEDevice::setPower(ESP_PWR_LVL_P9); /** +9db */
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/** Optional: set any devices you don't want to get advertisments from */
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// NimBLEDevice::addIgnored(NimBLEAddress ("aa:bb:cc:dd:ee:ff"));
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/** create new scan */
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NimBLEScan* pScan = NimBLEDevice::getScan();
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/** create a callback that gets called when advertisers are found */
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pScan->setAdvertisedDeviceCallbacks(new AdvertisedDeviceCallbacks());
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/** Set scan interval (how often) and window (how long) in milliseconds */
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pScan->setInterval(45);
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pScan->setWindow(15);
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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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/** Start scanning for advertisers for the scan time specified (in seconds) 0 = forever
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* Optional callback for when scanning stops.
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*/
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pScan->start(scanTime, scanEndedCB);
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}
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void loop (){
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/** Loop here until we find a device we want to connect to */
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while(!doConnect){
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if(BTClient){
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Serial.print(millis());
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Serial.print(": ");
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Serial.println( (int)(BTChr->readValue().data()[0]));
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}
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//Serial.println(millis());
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delay(10);
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}
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doConnect = false;
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connectToServer();
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// NimBLEDevice::getScan()->start(scanTime,scanEndedCB);
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}
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