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MTU value available in the BleManager

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Aleksander Nowakowski
2018-04-11 11:36:40 +02:00
parent ead5ca68cd
commit 5f69f9bcf0
1 changed files with 29 additions and 0 deletions
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29
wear/src/main/java/no/nordicsemi/android/nrftoolbox/ble/BleManager.java
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@@ -101,6 +101,10 @@ public class BleManager implements BleProfileApi {
private int mConnectionState = BluetoothGatt.STATE_DISCONNECTED;
/** Last received battery value or -1 if value wasn't received. */
private int mBatteryValue = -1;
/**
* The current MTU (Maximum Transfer Unit). The maximum number of bytes that can be sent in a single packet is MTU-3.
*/
private int mMtu = 23;
private final BroadcastReceiver mBluetoothStateBroadcastReceiver = new BroadcastReceiver() {
@Override
@@ -579,6 +583,31 @@ public class BleManager implements BleProfileApi {
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && enqueue(Request.newMtuRequest(mtu));
}
/**
* Returns the current MTU (Maximum Transfer Unit). MTU specifies the maximum number of bytes that can
* be sent in a single write operation. 3 bytes are used for internal purposes, so the maximum size is MTU-3.
* The value will changed only if requested with {@link #requestMtu(int)} and a successful callback is received.
* If the peripheral requests MTU change, the {@link BluetoothGattCallback#onMtuChanged(BluetoothGatt, int, int)}
* callback is not invoked, therefor the returned MTU value will not be correct.
* Use {@link android.bluetooth.BluetoothGattServerCallback#onMtuChanged(BluetoothDevice, int)} to get the
* callback with right value requested from the peripheral side.
* @return the current MTU value. Default to 23.
*/
protected final int getMtu() {
return mMtu;
}
/**
* This method overrides the MTU value. Use it only when the peripheral has changed MTU and you
* received the {@link android.bluetooth.BluetoothGattServerCallback#onMtuChanged(BluetoothDevice, int)}
* callback. If you want to set MTU as a master, use {@link #requestMtu(int)} instead.
* @param mtu the MTU value set by the peripheral.
*/
protected final void overrideMtu(final int mtu) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
mMtu = mtu;
}
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private boolean internalRequestMtu(final int mtu) {
final BluetoothGatt gatt = mBluetoothGatt;