63 lines
2.5 KiB
Arduino
63 lines
2.5 KiB
Arduino
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/*********
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Rui Santos
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Complete instructions at https://RandomNerdTutorials.com/esp32-ble-server-client/
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files.
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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*********/
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#include "BLEDevice.h"
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#include <Wire.h>
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//BLE Server name (the other ESP32 name running the server sketch)
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#define bleServerName "YourESP32"
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/* UUID's of the service, characteristic that we want to read*/
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// BLE Service
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static BLEUUID bmeServiceUUID("91bad492-b950-4226-aa2b-4ede9fa42f59");
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//Temperature Celsius Characteristic
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static BLEUUID temperatureCharacteristicUUID("cba1d466-344c-4be3-ab3f-189f80dd7518");
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//Flags stating if should begin connecting and if the connection is up
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static boolean doConnect = false;
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static boolean connected = false;
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//Address of the peripheral device. Address will be found during scanning...
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static BLEAddress* pServerAddress;
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//Characteristicd that we want to read
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static BLERemoteCharacteristic* temperatureCharacteristic;
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//Activate notify
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const uint8_t notificationOn[] = { 0x1, 0x0 };
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const uint8_t notificationOff[] = { 0x0, 0x0 };
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//Variables to store temperature and humidity
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char* temperatureChar;
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//Flags to check whether new temperature and humidity readings are available
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boolean newTemperature = false;
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boolean newHumidity = false;
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//Connect to the BLE Server that has the name, Service, and Characteristics
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bool connectToServer(BLEAddress pAddress) {
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BLEClient* pClient = BLEDevice::createClient();
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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(*pServerAddress)) {
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Serial.println("We are now connected to the BLE Server.");
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//Activate the Notify property of each Characteristic
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temperatureCharacteristic->getDescriptor(BLEUUID((uint16_t)0x2902))->writeValue((uint8_t*)notificationOn, 2, true);
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humidityCharacteristic->getDescriptor(BLEUUID((uint16_t)0x2902))->writeValue((uint8_t*)notificationOn, 2, true);
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connected = true;
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} else {
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Serial.println("We have failed to connect to the server; Restart your device to scan for nearby BLE server again.");
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}
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doConnect = false;
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}
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delay(1000); // Delay a second between loops.
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}
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