init

test/sketch.yaml

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+default_port: /dev/ttyACM0
+default_fqbn: esp32:esp32:esp32s2

test/test.ino

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