I am trying to do like a basic BLE Server that advertises the value.
I edited code from Getting Started with ESP32 Bluetooth Low Energy (BLE) on Arduino IDE
I only want to see the temperature for now to understand the basics.
Everything is working fine and Vlaues are showing on serial monitor
But when I connect to nRf app it shows N/A in the value field.
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_BMP280.h>
#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>
#include <Adafruit_Sensor.h>
#define BMP_SCK (13)
#define BMP_MISO (12)
#define BMP_MOSI (11)
#define BMP_CS (10)
#define temperatureCelsius
//BLE server name
#define bleServerName "BMP280_ESP32"
Adafruit_BMP280 bmp; // I2C
//Adafruit_BMP280 bmp(BMP_CS); // hardware SPI
//Adafruit_BMP280 bmp(BMP_CS, BMP_MOSI, BMP_MISO, BMP_SCK);
float temp;
//float tempF;
//float hum;
// Timer variables
unsigned long lastTime = 0;
unsigned long timerDelay = 30000;
bool deviceConnected = false; //if the client is connected to server
#define SERVICE_UUID "91bad492-b950-4226-aa2b-4ede9fa42f59"
// Temperature Characteristic and Descriptor
#ifdef temperatureCelsius
BLECharacteristic bmeTemperatureCelsiusCharacteristics("cba1d466-344c-4be3-ab3f-189f80dd7518", BLECharacteristic::PROPERTY_NOTIFY);
BLEDescriptor bmeTemperatureCelsiusDescriptor(BLEUUID((uint16_t)0x2902));
//#else
//BLECharacteristic bmeTemperatureFahrenheitCharacteristics("f78ebbff-c8b7-4107-93de-889a6a06d408", BLECharacteristic::PROPERTY_NOTIFY);
//BLEDescriptor bmeTemperatureFahrenheitDescriptor(BLEUUID((uint16_t)0x2901));
#endif
// Humidity Characteristic and Descriptor
//BLECharacteristic bmeHumidityCharacteristics("ca73b3ba-39f6-4ab3-91ae-186dc9577d99", BLECharacteristic::PROPERTY_NOTIFY);
//BLEDescriptor bmeHumidityDescriptor(BLEUUID((uint16_t)0x2903));
//Setup callbacks onConnect and onDisconnect
class MyServerCallbacks: public BLEServerCallbacks {
void onConnect(BLEServer* pServer) {
deviceConnected = true;
};
void onDisconnect(BLEServer* pServer) {
deviceConnected = false;
}
};
void setup() {
Serial.begin(9600);
while ( !Serial ) delay(100); // wait for native usb
Serial.println(F("BMP280 test"));
unsigned status;
//status = bmp.begin(BMP280_ADDRESS_ALT, BMP280_CHIPID);
status = bmp.begin();
if (!status) {
Serial.println(F("Could not find a valid BMP280 sensor, check wiring or "
"try a different address!"));
Serial.print("SensorID was: 0x"); Serial.println(bmp.sensorID(),16);
Serial.print(" ID of 0xFF probably means a bad address, a BMP 180 or BMP 085\n");
Serial.print(" ID of 0x56-0x58 represents a BMP 280,\n");
Serial.print(" ID of 0x60 represents a BME 280.\n");
Serial.print(" ID of 0x61 represents a BME 680.\n");
while (1) delay(10);
}
// Create the BLE Device
BLEDevice::init(bleServerName);
// Create the BLE Server
BLEServer *pServer = BLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());
// Create the BLE Service
BLEService *bmeService = pServer->createService(SERVICE_UUID);
// Create BLE Characteristics and Create a BLE Descriptor
// Temperature
#ifdef temperatureCelsius
bmeService->addCharacteristic(&bmeTemperatureCelsiusCharacteristics);
bmeTemperatureCelsiusDescriptor.setValue("BMP temperature Celsius");
bmeTemperatureCelsiusCharacteristics.addDescriptor(&bmeTemperatureCelsiusDescriptor);
#endif
bmeService->start();
// Start advertising
BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
pAdvertising->addServiceUUID(SERVICE_UUID);
pServer->getAdvertising()->start();
Serial.println("Waiting a client connection to notify...");
}
void loop() {
if (deviceConnected) {
if ((millis() - lastTime) > timerDelay) {
// Read temperature as Celsius (the default)
temp = bmp.readTemperature();
// Fahrenheit
// tempF = 1.8*temp +32;
// Read humidity
//hum = bme.readHumidity();
//Notify temperature reading from BME sensor
#ifdef temperatureCelsius
static char temperatureCTemp[6];
dtostrf(temp, 6, 2, temperatureCTemp);
//Set temperature Characteristic value and notify connected client
bmeTemperatureCelsiusCharacteristics.setValue(temperatureCTemp);
bmeTemperatureCelsiusCharacteristics.notify();
Serial.print("Temperature Celsius: ");
Serial.print(temp);
Serial.print(" ºC \n");
#endif
lastTime = millis();
}
}
}
