bt_gatt_write_value_noresp HowTo convert ascii uint8_t string *.

my C knowledge is very poor and so I have a question.

use case:

Crystal APP

connected to a custom equipment

Find services and connect to services: OK

Characteristics of the found Services

Record the reading for the notification Service: OK - all notifications are coming through

now, I also have to WRITE a feature using

int bt_gatt_write_value_noresp(int instance, uint16_t handle, uint16_t offset, const uint8_t *data, int size)

This is the command that I want to write to the device as a String:

"$HTMEA, 1, 7 * 7F\r\n".

How to convert this string ascii uint8_t *?

and what is the length (size)?

using the. toAscii() I take a ByteArray and there is a. constData() which gives me a char *- but it does not help.

looked at BT THE Primer, examples of applications and blogs, but did not find an example where a QString will be converted and sent to the device.

the other way back to recall notice where the uint8_t * was transformed into a QString, I found in the sample application and this heart rate monitor market.

thx for help

overdraft.

First, I had to get the hexadecimal value of my request chain.

QString theRequest = "$HTMEA,1,,7*7F\r\n";const int characteristicLen = theRequest.size();uint8_t *characteristicBuffer = (uint8_t *) alloca(characteristicLen + 1);QString theRequestAsHex = theRequest.toAscii().toHex();

so I found some utilities BT THE sample applications to help me turn this into uint8_t *.

Utilities::hexToIntArray(theRequestAsHex, characteristicBuffer);

The following methods of the utility:

const QString Utilities::HEX_CHARS = QString("0123456789ABCDEF");
uint8_t Utilities::hexToInt(QChar c1, QChar c2) {
    c1 = c1.toUpper();
    c2 = c2.toUpper();
    uint8_t result = 0;
    result = HEX_CHARS.indexOf(c1) * 16;
    result = result + HEX_CHARS.indexOf(c2);
    return result;
}
void Utilities::hexToIntArray(QString hex_string, uint8_t* output) {
    const size_t numdigits = hex_string.length() / 2;
    for (size_t i = 0; i != numdigits; ++i) {
        output[i] = hexToInt(hex_string.at(2 * i), hex_string.at(2 * i + 1));
    }
}

Thanks to the old guys BlackBerry John Murray and Martin Woolley, for all their great stuff on BT, BTLE and NFC.

Tags: BlackBerry Developers

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