Help for using bglib

[damien-r]

Hello,

I'm trying to use your library to connect to a BLE device, but I can't figure how to read attributes.

I could connect to my port com and scan for devices, and I think I can connect to the device I want, but I can not read attributes.

I use bgapi.send_gap_connect_direct(sender, 1, 0x20, 0x3C, 0x64, 0); to connect to my device, and that leads to receive_gap_connect_direct callback. The problem is that this callback does not give a connection number and the callback receive_connection_status that seems to be the only callback that give the connection number is never called.

And then, which method should I call to read an attribute by uuid?

Could you tell me what I do wrong and help me, please?

Thank you

[pfelgaer]

@damien-raemy Hi, I am trying to integrate a BLE device in a Java application. Did you find a way to do it? Or any other help is also appreciated.

Thanks!

[damien-r]

Hi, sorry, I see your question only now.

First, be sure you use a BLED112 device, otherwise the library won't work.

Then, my problem was, if I remember correctly, that I did not pass corrects arguments to send_gap_connect_direct. You get the values in the receive_gap_scan_response callback. The intervals are available in the data. I made an object to get the data:

AdvertisingData(byte[] data) {
    for (int i = 0; i < data.length; /*increment made in loop*/) {
        byte length = data[i];
        byte type = data[i + 1];
        switch (type) {
            case DEVICE_NAME:
                byte[] deviceNameBytes = Arrays.copyOfRange(data,
                        i + 2, i + length + 1);
                deviceName = new String(deviceNameBytes);
                break;
            case SLAVE_CONNECTION_INTERVAL_RANGE:
                // Intervals seems to be in little endian
                connectionIntervalMin = (((int) data[i + 3]) << 8)
                        + ((int) data[i + 2]);
                connectionIntervalMax = (((int) data[i + 5]) << 8)
                        + data[i + 4];
                break;
        }
        i += length + 1; // +1 because length field is not part of length
    }
}

For the two last arguments, I hard-coded 700 and 0, I don't remember why. Finally, here is how I call the method: bgapi.send_gap_connect_direct(address, addressType, advertisingData.getConnectionIntervalMin(), advertisingData.getConnectionIntervalMax(), 700, 0);

Then, I receive the connection number by the receive_connection_status method.

[damien-r]

I forgot to include the constants :

/**
 * Type that indicate that the data is the device name
 */
private static final int DEVICE_NAME = 0x09;
/**
 * Type that indicate that the section is the connection interval range
 */
private static final int SLAVE_CONNECTION_INTERVAL_RANGE = 0x12;