On android, How to send data to HM-10?

I connected to hm-10 from android well.
Hm-10 is not flicking anymore.

but after connected,

How can I send String data to Hm-10?

private ScanCallback mScanCallback = new ScanCallback() {

        @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
        @Override
        public void onScanResult(int callbackType, ScanResult result) {
            System.out.println("BLE// onScanResult");
            super.onScanResult(callbackType, result);

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                Log.e("action","this name : "+result.getDevice().getName());
                Log.e("action","this addr : "+result.getDevice().getAddress());
                Log.e("action","this getuuid is : "+result.getDevice().getUuids());
            }

            if(result.getDevice().getAddress().equals("0C:B2:B7:7B:B2:BB")){
                BluetoothDevice btDevice = result.getDevice();
                Log.e("action","BB sending. : "+btDevice.toString());
                connectToDevice(btDevice);

                return;
            }

        }

        @Override
        public void onBatchScanResults(List<ScanResult> results) {
            System.out.println("BLE// onBatchScanResults");
            Log.e("action","onBatchScanResults");
            for (ScanResult sr : results) {
                Log.e("action", "testing..."+sr.toString());
            }
        }

        @Override
        public void onScanFailed(int errorCode) {
            System.out.println("BLE// onScanFailed");
            Log.e("action", "Error Code: " + errorCode);
        }

    };
    
------------------------------------------
    public void connectToDevice(BluetoothDevice device)
    {

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
                Log.e("action","connectToDevice");
                bluetoothGatt = device.connectGatt(this, false, mainGattCallback);
            }
            scanLeDevice(false);// will stop after first device detection
    }

--------

     private final BluetoothGattCallback mainGattCallback = new BluetoothGattCallback()
    {
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState)
        {
            switch (newState)
            {
                case BluetoothProfile.STATE_CONNECTED:
                    Log.e("action", "CONNECTED");

                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
                        gatt.discoverServices();
                    }
                    break;
                case BluetoothProfile.STATE_DISCONNECTED:
                    Log.e("action", "DISCONNECTED");
                    break;
                default:
                    Log.e("action", "STATE_OTHER");
            }
        }
        public void onServicesDiscovered(BluetoothGatt gatt, int status)
        {

        }
        public void onCharacteristicRead(BluetoothGatt gatt,
                                         BluetoothGattCharacteristic
                                                 characteristic, int status)
        {

        }
    };

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