gatt status 147 error on Samsung Galaxy, won't display in Windows #1005
Description
Arduino IDE, ESP32 v2.0.18 core
me: intermediate level programmer
Was using v1.4.3:
-works fine with most devices
-didn't work at all with Samsung Galaxy
-displays on Win11 ble scan but won't connect
So, I upgraded to v2.3.2 (Arduino IDE) and tried my best.
With v2.3.2:
-visible/connects on Samsung Galaxy phone, but gives gatt status 147 error
-visible/connects on iOS 15.3 phone
-doesn't display on my Win11 scan
My device is not a keyboard or mouse, it just exchanges UART data. However, it must be displayed during BLE scans, so I assume it should continue to be HID. Correct? When I do it without HID, it just disappears from my device BLE scans. It does show up properly using nRF, though. No encryption needed, but can if required.
What am I doing wrong?
#include <NimBLEDevice.h>
#include <NimBLEHIDDevice.h>
#include <NimBLEServer.h>
#define SERVICE_UUID "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"
#define CHARACTERISTIC_UUID_RX "6E400002-B5A3-F393-E0A9-E50E24DCCA9E"
#define CHARACTERISTIC_UUID_TX "6E400003-B5A3-F393-E0A9-E50E24DCCA9E"
NimBLEServer* pServer = nullptr;
NimBLECharacteristic* pRxCharacteristic = nullptr;
NimBLECharacteristic* pTxCharacteristic = nullptr;
NimBLEHIDDevice* hidDevice = nullptr;
volatile bool newDataReady = false;
class MyCallbacks : public NimBLECharacteristicCallbacks {
void onWrite(NimBLECharacteristic* pCharacteristic) {
std::string rxValue = pCharacteristic->getValue();
if (!rxValue.empty()) {
newDataReady = true;
Serial.print("Received: ");
Serial.println(rxValue.c_str());
}
}
};
void bluetooth_setup() {
NimBLEDevice::init("ESP32_UART_BLE");
NimBLEDevice::setPower(ESP_PWR_LVL_P9);
pServer = NimBLEDevice::createServer();
// Add HID device to improve visibility across platforms
hidDevice = new NimBLEHIDDevice(pServer);
hidDevice->setManufacturer("OP");
hidDevice->setPnp(0x02, 0x5E4, 0x820A, 0x0210); // USB VID, PID, version
hidDevice->setHidInfo(0x00, 0x01); // HID version 1.0
// Create custom UART-like service
NimBLEService* pService = pServer->createService(SERVICE_UUID);
pTxCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID_TX,
NIMBLE_PROPERTY::NOTIFY
);
pRxCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID_RX,
NIMBLE_PROPERTY::WRITE
);
pRxCharacteristic->setCallbacks(new MyCallbacks());
pService->start();
Serial.println("BLE service started!");
NimBLEAdvertising* pAdvertising = NimBLEDevice::getAdvertising();
pAdvertising->addServiceUUID(SERVICE_UUID);
pAdvertising->addServiceUUID(hidDevice->getHidService()->getUUID());
pAdvertising->setAppearance(0x03C0); // Generic HID device
// Proper scan response data (name + manufacturer)
NimBLEAdvertisementData scanResponseData;
scanResponseData.setName("ESP32_UART_BLE");
scanResponseData.setManufacturerData("OP");
pAdvertising->setScanResponseData(scanResponseData);
pAdvertising->start();
Serial.println("Waiting for a client connection...");
}
void setup() {
Serial.begin(115200);
bluetooth_setup();
}
void loop() {
if (newDataReady) {
newDataReady = false;
std::string response = "OK\n";
pTxCharacteristic->setValue(response);
pTxCharacteristic->notify();
}
delay(10);
}