ble_demo for 6pm

ble_demo.java

package com.sixpmplc.ble_demo;

import android.annotation.TargetApi;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattDescriptor;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothProfile;
import android.bluetooth.le.BluetoothLeScanner;
import android.bluetooth.le.ScanCallback;
import android.bluetooth.le.ScanFilter;
import android.bluetooth.le.ScanResult;
import android.bluetooth.le.ScanSettings;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

@TargetApi(21)
public class MainActivity extends ActionBarActivity {
    private BluetoothAdapter mBluetoothAdapter;
    private int REQUEST_ENABLE_BT = 1;
    private Handler mHandler;
    private static final long SCAN_PERIOD = 30000;
    private BluetoothLeScanner mLEScanner;
    private ScanSettings settings;
    private List<ScanFilter> filters;
    private BluetoothGatt mGatt;
    private BluetoothDevice mDevice;

    // setup UI handler
    private final static int UPDATE_DEVICE = 0;
    private final static int UPDATE_VALUE = 1;
    private final Handler uiHandler = new Handler() {
        public void handleMessage(Message msg) {
            final int what = msg.what;
            final String value = (String) msg.obj;
            switch(what) {
                case UPDATE_DEVICE: updateDevice(value); break;
                case UPDATE_VALUE: updateValue(value); break;
            }
        }
    };

    private void updateDevice(String devName){
        TextView t=(TextView)findViewById(R.id.dev_type);
        t.setText(devName);
    }

    private void updateValue(String value){
        TextView t=(TextView)findViewById(R.id.value_read);
        t.setText(value);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mHandler = new Handler();
        if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
            Toast.makeText(this, "BLE Not Supported",
                    Toast.LENGTH_SHORT).show();
            finish();
        }
        final BluetoothManager bluetoothManager =
                (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
        mBluetoothAdapter = bluetoothManager.getAdapter();

    }

    @Override
    protected void onResume() {
        super.onResume();
        if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) {
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
        } else {
            if (Build.VERSION.SDK_INT >= 21) {
                mLEScanner = mBluetoothAdapter.getBluetoothLeScanner();
                settings = new ScanSettings.Builder()
                        .setScanMode(ScanSettings.SCAN_MODE_LOW_LATENCY)
                        .build();
                filters = new ArrayList<ScanFilter>();
            }
            scanLeDevice(true);
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (mBluetoothAdapter != null && mBluetoothAdapter.isEnabled()) {
            scanLeDevice(false);
        }
    }

    @Override
    protected void onDestroy() {
        if (mGatt == null) {
            return;
        }
        mGatt.close();
        mGatt = null;
        super.onDestroy();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_ENABLE_BT) {
            if (resultCode == Activity.RESULT_CANCELED) {
                //Bluetooth not enabled.
                finish();
                return;
            }
        }
        super.onActivityResult(requestCode, resultCode, data);
    }

    private void scanLeDevice(final boolean enable) {
        if (enable) {
            mHandler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    if (Build.VERSION.SDK_INT < 21) {
                        mBluetoothAdapter.stopLeScan(mLeScanCallback);
                    } else {
                        mLEScanner.stopScan(mScanCallback);

                    }
                }
            }, SCAN_PERIOD);
            if (Build.VERSION.SDK_INT < 21) {
                mBluetoothAdapter.startLeScan(mLeScanCallback);
            } else {
                mLEScanner.startScan(filters, settings, mScanCallback);
            }
        } else {
            if (Build.VERSION.SDK_INT < 21) {
                mBluetoothAdapter.stopLeScan(mLeScanCallback);
            } else {
                mLEScanner.stopScan(mScanCallback);
            }
        }
    }


    private ScanCallback mScanCallback = new ScanCallback() {
        @Override
        public void onScanResult(int callbackType, ScanResult result) {
            Log.i("callbackType", String.valueOf(callbackType));
            String devicename = result.getDevice().getName();

            if (devicename != null){
                if (devicename.startsWith("TAIDOC")){
                    Log.i("result", "Device name: "+devicename);
                    Log.i("result", result.toString());
                    BluetoothDevice btDevice = result.getDevice();
                    connectToDevice(btDevice);
                }
            }

        }

        @Override
        public void onBatchScanResults(List<ScanResult> results) {
            for (ScanResult sr : results) {
                Log.i("ScanResult - Results", sr.toString());
            }
        }

        @Override
        public void onScanFailed(int errorCode) {
            Log.e("Scan Failed", "Error Code: " + errorCode);
        }
    };

    private BluetoothAdapter.LeScanCallback mLeScanCallback =
            new BluetoothAdapter.LeScanCallback() {
                @Override
                public void onLeScan(final BluetoothDevice device, int rssi,
                                     byte[] scanRecord) {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            Log.i("onLeScan", device.toString());
                            connectToDevice(device);
                        }
                    });
                }
            };

    public void connectToDevice(BluetoothDevice device) {
        if (mGatt == null) {
            Log.d("connectToDevice", "connecting to device: "+device.toString());
            this.mDevice = device;
            mGatt = device.connectGatt(this, false, gattCallback);
            scanLeDevice(false);// will stop after first device detection
        }
    }

    private final BluetoothGattCallback gattCallback = new BluetoothGattCallback() {


        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            Log.i("onConnectionStateChange", "Status: " + status);
            switch (newState) {
                case BluetoothProfile.STATE_CONNECTED:
                    Log.i("gattCallback", "STATE_CONNECTED");

                    //update UI
                    Message msg = Message.obtain();

                    String deviceName = gatt.getDevice().getName();
                    switch (deviceName){
                        case "TAIDOC TD1261":
                            deviceName = "Thermo";
                            break;
                        case "TAIDOC TD8255":
                            deviceName = "SPO2";
                            break;
                        case "TAIDOC TD4279":
                            deviceName = "SPO2";
                            break;
                    }

                    msg.obj = deviceName;
                    msg.what = 0;
                    msg.setTarget(uiHandler);
                    msg.sendToTarget();

                    gatt.discoverServices();
                    break;
                case BluetoothProfile.STATE_DISCONNECTED:
                    Log.e("gattCallback", "STATE_DISCONNECTED");
                    Log.i("gattCallback", "reconnecting...");
                    BluetoothDevice mDevice = gatt.getDevice();
                    mGatt = null;
                    connectToDevice(mDevice);
                    break;
                default:
                    Log.e("gattCallback", "STATE_OTHER");
            }

        }

        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status) {
            mGatt = gatt;
            List<BluetoothGattService> services = gatt.getServices();
            Log.i("onServicesDiscovered", services.toString());
            BluetoothGattCharacteristic therm_char = services.get(2).getCharacteristics().get(0);

            for (BluetoothGattDescriptor descriptor : therm_char.getDescriptors()) {
                descriptor.setValue( BluetoothGattDescriptor.ENABLE_INDICATION_VALUE);
                mGatt.writeDescriptor(descriptor);
            }

            //gatt.readCharacteristic(therm_char);
            gatt.setCharacteristicNotification(therm_char, true);

        }

        @Override
        public void onCharacteristicRead(BluetoothGatt gatt,
                                         BluetoothGattCharacteristic
                                                 characteristic, int status) {
            Log.i("onCharacteristicRead", characteristic.toString());
            byte[] value=characteristic.getValue();
            String v = new String(value);
            Log.i("onCharacteristicRead", "Value: " + v);
            //gatt.disconnect();
        }

        @Override
        public void onCharacteristicChanged(BluetoothGatt gatt,
                                         BluetoothGattCharacteristic
                                                 characteristic) {
            float char_float_value = characteristic.getFloatValue(BluetoothGattCharacteristic.FORMAT_FLOAT,1);
            Log.i("onCharacteristicChanged", Float.toString(char_float_value));


            String deviceName = gatt.getDevice().getName();
            String value = null;
            switch (deviceName){
                case "TAIDOC TD1261":
                    value = Float.toString(char_float_value);
                    break;
                case "TAIDOC TD8255":
                    value = Float.toString(char_float_value*10);
                    break;
            }

            //update UI
            Message msg = Message.obtain();
            msg.obj = value;
            msg.what = 1;
            msg.setTarget(uiHandler);
            msg.sendToTarget();



            //gatt.disconnect();
        }

    };
}

Can you send me service code for this BLE?

I have small doubt. I would like to know whether pair occur with button click on xml (or) first the device has to paired with the mobile device.

Can you send me service code for this BLE?

Have you successfully sent/receive data?