Created
April 7, 2020 10:36
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ESP32 BLE GPIO
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| #include <BLEDevice.h> | |
| #include <BLEServer.h> | |
| #include <BLEUtils.h> | |
| #include <BLE2902.h> | |
| BLEServer* pServer = NULL; | |
| BLECharacteristic* pCharacteristic = NULL; | |
| bool deviceConnected = false; | |
| bool oldDeviceConnected = false; | |
| uint32_t value = 0; | |
| //Clone HM10 | |
| #define SERVICE_UUID "0000ffe0-0000-1000-8000-00805f9b34fb" | |
| #define CHARACTERISTIC_UUID "0000ffe1-0000-1000-8000-00805f9b34fb" | |
| // | |
| const int ledPin = GPIO_NUM_2; | |
| String inputString = ""; // a String to hold incoming data | |
| bool stringComplete = false; // whether the string is complete | |
| bool ledOn = false; // whether the string is complete | |
| class ServerCallbacks: public BLEServerCallbacks { | |
| void onConnect(BLEServer* pServer) { | |
| deviceConnected = true; | |
| BLEDevice::startAdvertising(); | |
| }; | |
| void onDisconnect(BLEServer* pServer) { | |
| deviceConnected = false; | |
| } | |
| }; | |
| class WriteCallbacks: public BLECharacteristicCallbacks { | |
| void onWrite(BLECharacteristic *pCharacteristic) { | |
| std::string rxValue = pCharacteristic->getValue(); | |
| if (rxValue.length() > 0) { | |
| for (int i = 0; i < rxValue.length(); i++) | |
| { | |
| char inChar = (char)rxValue[i]; | |
| // add it to the inputString: | |
| inputString += inChar; | |
| // if the incoming character is a newline, set a flag so the main loop can | |
| // do something about it: | |
| if (inChar == '\n') { | |
| stringComplete = true; | |
| } | |
| } | |
| } | |
| } | |
| }; | |
| void blePrint(std::string value) { | |
| pCharacteristic->setValue(value); | |
| pCharacteristic->notify(); | |
| delay(10); // bluetooth stack will go into congestion, if too many packets are sent, in 6 hours test i was able to go as low as 3ms | |
| } | |
| void setup() { | |
| pinMode(ledPin, OUTPUT); | |
| Serial.begin(115200); | |
| // Create the BLE Device | |
| BLEDevice::init("ESP32BLE"); | |
| // Create the BLE Server | |
| pServer = BLEDevice::createServer(); | |
| pServer->setCallbacks(new ServerCallbacks()); | |
| // Create the BLE Service | |
| BLEService *pService = pServer->createService(SERVICE_UUID); | |
| // Create a BLE Characteristic | |
| pCharacteristic = pService->createCharacteristic( | |
| CHARACTERISTIC_UUID, | |
| BLECharacteristic::PROPERTY_READ | | |
| BLECharacteristic::PROPERTY_WRITE | | |
| BLECharacteristic::PROPERTY_NOTIFY | |
| ); | |
| // https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml | |
| // Create a BLE Descriptor | |
| pCharacteristic->addDescriptor(new BLE2902()); | |
| pCharacteristic->setCallbacks(new WriteCallbacks()); | |
| // Start the service | |
| pService->start(); | |
| // Start advertising | |
| BLEAdvertising *pAdvertising = BLEDevice::getAdvertising(); | |
| pAdvertising->addServiceUUID(SERVICE_UUID); | |
| pAdvertising->setScanResponse(false); | |
| pAdvertising->setMinPreferred(0x0); // set value to 0x00 to not advertise this parameter | |
| BLEDevice::startAdvertising(); | |
| Serial.println("Waiting a client connection to notify..."); | |
| } | |
| void loop() { | |
| if (stringComplete) { | |
| inputString.trim(); | |
| Serial.println(inputString); | |
| if (inputString == "ON") { | |
| digitalWrite(ledPin, HIGH); | |
| blePrint("ON\r\n"); | |
| ledOn = true; | |
| } | |
| else if (inputString == "OFF") { | |
| digitalWrite(ledPin, LOW); | |
| blePrint("OFF\r\n"); | |
| ledOn = false; | |
| } | |
| else if (inputString == "Sync") { | |
| if (ledOn) | |
| blePrint("ON\r\n"); | |
| else | |
| blePrint("OFF\r\n"); | |
| } | |
| // clear the string: | |
| inputString = ""; | |
| stringComplete = false; | |
| delay(20);//Time for Bluetooth stack handle | |
| } | |
| // disconnecting | |
| if (!deviceConnected && oldDeviceConnected) { | |
| delay(500); // give the bluetooth stack the chance to get things ready | |
| pServer->startAdvertising(); // restart advertising | |
| Serial.println("start advertising"); | |
| oldDeviceConnected = deviceConnected; | |
| } | |
| // connecting | |
| if (deviceConnected && !oldDeviceConnected) { | |
| // do stuff here on connecting | |
| oldDeviceConnected = deviceConnected; | |
| } | |
| } |
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