I have a question about the below function:
I guess there is an ” else ” missed.
the statemant I sandwiched with “//////////////////////…” seems always go through ( connectToServer() always delivers true ) no matter previous if result.

bool connectToServer(BLEAddress pAddress) {
BLEClient* pClient = BLEDevice::createClient();

// Connect to the remove BLE Server.
pClient->connect(pAddress);
Serial.println(” – Connected to server”);

// Obtain a reference to the service we are after in the remote BLE server.
BLERemoteService* pRemoteService = pClient->getService(bmeServiceUUID);
if (pRemoteService == nullptr) {
Serial.print(“Failed to find our service UUID: “);
Serial.println(bmeServiceUUID.toString().c_str());
return (false);
}

// Obtain a reference to the characteristics in the service of the remote BLE server.
temperatureCharacteristic = pRemoteService->getCharacteristic(temperatureCharacteristicUUID);
humidityCharacteristic = pRemoteService->getCharacteristic(humidityCharacteristicUUID);

if (temperatureCharacteristic == nullptr || humidityCharacteristic == nullptr) {
Serial.print(“Failed to find our characteristic UUID”);
return false;
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Serial.println(” – Found our characteristics”);

//Assign callback functions for the Characteristics
temperatureCharacteristic->registerForNotify(temperatureNotifyCallback);
humidityCharacteristic->registerForNotify(humidityNotifyCallback);
return true;
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}

I have mostly got all this working and have client and server talking to eachother.

I want to send the data between them using numerical data, ie integers, rather than character strings. I have managed to do this at the server end, but can not figure out what I need to change at the client end.

David

Is there any simple sample sketch for Server and Client which both of them can send and receive data between Server and Client. Thanks in advance

Added call back.
// Custom Security Callback Class
class MySecurity : public BLESecurityCallbacks {
uint32_t onPassKeyRequest() {
Serial.println(“Requested passkey”);
// Return the passkey expected by the server
return passkey; // Replace with your passkey
}
void onPassKeyNotify(uint32_t pass_key) {
Serial.printf(“Passkey Notify: %d\n”, pass_key);
}
bool onConfirmPIN(uint32_t pass_key) {
Serial.printf(“Confirm Passkey: %d\n”, pass_key);
return true; // Accept the passkey
}
bool onSecurityRequest() {
return true;
}
void onAuthenticationComplete(esp_ble_auth_cmpl_t auth_cmpl) {
if(auth_cmpl.success) {
Serial.println(“Pairing success!”);
} else {
Serial.println(“Pairing failed!”);
}
}
};

Calling this before “LEClient* pClient = BLEDevice::createClient();”
BLEDevice::setEncryptionLevel(ESP_BLE_SEC_ENCRYPT);
BLEDevice::setSecurityCallbacks(new MySecurity());

BLESecurity *pSecurity = new BLESecurity();
pSecurity->setAuthenticationMode(ESP_LE_AUTH_REQ_SC_ONLY); // Secure Connections Only
pSecurity->setCapability(ESP_IO_CAP_OUT); // Display Only (client provides passkey)
pSecurity->setRespEncryptionKey(ESP_BLE_ENC_KEY_MASK | ESP_BLE_ID_KEY_MASK);
pSecurity->setStaticPIN(passkey);
pSecurity->setKeySize(16);


Client code is now compiling I Copied and Pasted to the IDE
again and it worked cant explain what was wrong before but all good now
Thanks.