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    <p>I don't know about the Android BLE API, but I can tell you how this is supposed to work with Bluetooth Low Energy.</p> <p>The device name is stored in the GATT server (a local database on the cc2541 device). If you connect to the BLE device you should be able to do a discover to figure out the structure of the database and find the ATT handle for the device name.</p> <p>The GATT server is built up of attributes with a UUID (loosely defining the type of attribute) an attribute handle (the identifier used in this instance of the GATT server) and a value. According to [1] the UUID for the device name is 0x2A00. So you can search by type and find the handle with this UUID.</p> <p>Once you have the UUID it's just a matter of using the GATT client in the Android API to send a write request to this handle with the new value</p> <p>Edit: Looking at the API I think you should use getService(0x18, 0x00) [2] to get the primary service (which should contain the device name) and then writeCharacteristic[3] to update the name.</p> <p>From [4] it looks like the code should look something like this (not tested):</p> <pre><code>public void writeCharacteristic(byte[] value) { BluetoothGattService gap_service = mBluetoothGatt.getService( UUID.fromString("00001800-0000-1000-8000-00805F9B34FB")); if (gap_service == null) { System.out.println("gap_service null";); return; } BluetoothGattCharacteristic dev_name = gap_service.getCharacteristic( UUID.fromString("00002A00-0000-1000-8000-00805F9B34FB")); if (dev_name == null) { System.out.println("dev_name null";); return; } dev_name.setValue(value); boolean status = mBluetoothGatt.writeCharacteristic(dev_name); System.out.println("Write Status: " + status); } </code></pre> <ul> <li>[1] <a href="https://www.bluetooth.org/en-us/specification/assigned-numbers/generic-attribute-profile" rel="nofollow">bluetooth.org</a></li> <li>[2] <a href="http://developer.android.com/reference/android/bluetooth/BluetoothGatt.html#getService%28java.util.UUID%29" rel="nofollow">getService</a></li> <li>[3] <a href="http://developer.android.com/reference/android/bluetooth/BluetoothGatt.html#writeCharacteristic%28android.bluetooth.BluetoothGattCharacteristic%29" rel="nofollow">writeCharacteristic</a></li> <li>[4] <a href="https://devzone.nordicsemi.com/index.php/writing-to-a-characteristic-using-the-android-4-3-api" rel="nofollow">devzone.nordicsemi.com</a></li> </ul>
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    1. POHow to send the text data to CC2541 keyfob via Android 4.3?
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    1. USVegar Westerlund
    1. USVegar Westerlund
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    1. POHow to send the text data to CC2541 keyfob via Android 4.3?
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    1. CO@martin-wun: Have you been able to get it working?
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    2. COTahnks for you, Westerlund. But I still trying to use 0X2A00 to write the device name , not success yet...
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    3. CO@martin-wun: Are you using 0x2a00 as the UUID or the handle? You first need to find the attribute handle for UUID 0x2a00. There are several different ways of doing this, not sure what is easiest on Android. Then when you want to do the write you need to specify the handle, not the UUID.
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