Bluetooth BLE writeCharateristic problem.

Giorgio

Hi,
I am trying to make a simple Pc software able to communicate with my Bluetooth BLE peripheral.

My BLE peripheral includes a Custom Service (named as “Server_UART" with UUID 0003CDD0-0000-1000-8000-00805f9b0131 ) witch has two Characteristic:

Server_UART_Tx_data (UUID 0003CDD1-0000-1000-8000-00805f9b0131 ) with Notify Property and a Client Characteristic Configuration Descriptor to Notification enable
Server_UART_Rx_data (UUID 0003CDD2-0000-1000-8000-00805f9b0131 ) with
WriteWithoutResponse Properties.

Using heartlistener demo project (QT Demo project Page) as example, I realized a software able to scan, recognize and receive data from my Bluetooth BLE peripheral.
Any data sent from my BLE peripheral, arrived to my PC application and I am able to catch them.

Now, I want send data from my PC application to my bluetooth BLE peripheral.
I tried with this code:

void HeartRate::write(QByteArray data){

// Take Charateristic UUID - 0003CDD2-0000-1000-8000-00805f9b0131
const QLowEnergyCharacteristic hrChar = m_service->characteristic(
        m_service->characteristics().at(1).uuid());
if (!hrChar.isValid()) {
    setMessage("Data not found.");
    return;
}
m_service->writeCharacteristic(hrChar,data);

}

Nothing Happens!
No error signal is triggered by the service, no data arrived on BLE peripheral, nothing happens.

My BLE peripheral works because I tried with another App and all worked well.

Have you any idea?
Is there another way to write data into a specific BLE Characteristic?

My O.S. is Ubuntu 14.04 (32-bit) and Qt 5.5.

Giorgio.