Freenove ESP32-S3 User Manual

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Chapter 3 Bluetooth
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Write a Callback function for BLE server to manage connection of BLE.
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class MyServerCallbacks: public BLEServerCallbacks {
void onConnect(BLEServer* pServer) {
deviceConnected = true;
};
void onDisconnect(BLEServer* pServer) {
deviceConnected = false;
}
};
Write Callback function with BLE features. When it is called, as the mobile terminal send data to ESP32-S3, it
will store them into reload.
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class MyCallbacks: public BLECharacteristicCallbacks {
void onWrite(BLECharacteristic *pCharacteristic) {
std::string rxValue = pCharacteristic->getValue();
if (rxValue.length() > 0) {
rxload="";
for (int i = 0; i < rxValue.length(); i++){
rxload +=(char)rxValue[i];
}
}
}
};
Initialize the BLE function and name it.
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setupBLE("ESP32S3_Bluetooth");
When the mobile phone send data to ESP32-S3 via BLE Bluetooth, it will print them out with serial port;
When the serial port of ESP32-S3 receive data, it will send them to mobile via BLE Bluetooth.
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long now = millis();
if (now - lastMsg > 1000) {
if (deviceConnected&&rxload.length()>0) {
Serial.println(rxload);
rxload="";
}
if(Serial.available()>0){
String str=Serial.readString();
const char *newValue=str.c_str();
pCharacteristic->setValue(newValue);
pCharacteristic->notify();
}
lastMsg = now;
}

Freenove ESP32-S3 Specifications

General

Brand	Freenove
Model	ESP32-S3
Category	Control Unit
Language	English