Sending HEX data over Bluetooth (Android)

ahsan737

Greetings,
I am trying to send the following Hex string via Bluetooth

00 02 1b 53 90

and I have tried the following method to do that

    QByteArray hexString;

    hexString.append(QByteArray::number(00, 16));
    hexString.append(QByteArray::number(02, 16));
    hexString.append(QByteArray::number(27, 16));
    hexString.append(QByteArray::number(83, 16));
    hexString.append(QByteArray::number(144, 16));

    server->sendMessage(hexString);

but whenever I send it then the app gets closed unexpectedly.

The debug mode shows the following info:

How can I accomplish it?
Looking forward to a kind response.

jsulm

@ahsan737 Is server a valid pointer?

KroMignon

@ahsan737 said in Sending HEX data over Bluetooth (Android):

Greetings,
I am trying to send the following Hex string via Bluetooth
00 02 1b 53 90

and I have tried the following method to do that
QByteArray hexString;
hexString.append(QByteArray::number(00, 16));
hexString.append(QByteArray::number(02, 16));
hexString.append(QByteArray::number(27, 16));
hexString.append(QByteArray::number(83, 16));
hexString.append(QByteArray::number(144, 16));

server->sendMessage(hexString);

As QByteArray::number() documentation says, this will return a string:

QByteArray::number(144, 16) ==> returns a string with "90"

This is not what you want to have, try this:

    QByteArray hexString;

    hexString.append(quint8(0));
    hexString.append(quint8(2));
    hexString.append(quint8(27));
    hexString.append(quint8(83));
    hexString.append(quint8(144));

    server->sendMessage(hexString);

ahsan737

@KroMignon
@jsulm Thanks for your kind suggestions. the program crash was because of the invalid pointer. I've fixed that and then the following command did the rest of work

    QByteArray hexString= QByteArray::fromHex("00021b5390");
    socket->write(hexString);