README.md

bluetoothle-codenameone

Bluethooth LE Library for Codename One apps. This Library is based on the excellent cordova plugin from https://github.com/randdusing/cordova-plugin-bluetoothle

##Integration 1)Build the project
2)Place the CN1Bluethooth.cn1lib file in your CN1 project lib.
3)Add the CN1JSON.cn1lib file in your CN1 project lib. (https://github.com/shannah/CN1JSON/)
4)Right click on your CN1 project and select "Refresh Libs" then clean build your project.

Sample of Usage

        final Bluetooth bt = new Bluetooth();
        Form main = new Form("Bluetooth Demo");
        main.setLayout(new BoxLayout(BoxLayout.Y_AXIS));
        main.add(new Button(new Command("enable bluetooth") {

            @Override
            public void actionPerformed(ActionEvent evt) {

                try {
                    if (!bt.isEnabled()) {
                        bt.enable();
                    }
                    if (!bt.hasPermission()) {
                        bt.requestPermission();
                    }
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        }));
        main.add(new Button(new Command("initialize") {

            @Override
            public void actionPerformed(ActionEvent evt) {
                try {
                    bt.initialize(true, false, "bluetoothleplugin");
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }
        }));

	public void scan() 
	{
	
		if(LastConnectedUUID != null)		// String LastConnectedUUID, used to track last connected
		{
			try 
			{
				if(!Display.getInstance().isSimulator()) 
				{
					bt.disconnect(Parent.LastConnectedUUID);
				}
			} catch (IOException ex) {
				LogIt("scan() " + ex.getMessage());
			} catch (Exception ex) {
				LogIt("scan() " + ex.getMessage());
				
			}
		}

		
		FoundDevices.clear();	//     public List<String> FoundDevices

		try 
		{
			if(!Display.getInstance().isSimulator()) 
			{
				bt.startScan(new ActionListener() 
					{  
					@Override
						public void actionPerformed(ActionEvent evt) 
						{
							ScanDeviceFound(evt);
						}
					}, 
					null, 
					true, 
					Bluetooth.SCAN_MODE_LOW_POWER, 
					Bluetooth.MATCH_MODE_STICKY,
					Bluetooth.MATCH_NUM_MAX_ADVERTISEMENT, 
					Bluetooth.CALLBACK_TYPE_ALL_MATCHES);
			}
		} catch (IOException ex) {
				LogIt(ex.getMessage());
		} 

		Timer ScanTimer = new Timer();
		ScanTimer.schedule(new TimerTask() {
					@Override
					public void run() 
					{
						try 
						{
							if(!Display.getInstance().isSimulator())
								bt.stopScan();
						} catch (IOException ex) {
							LogIt(ex.getMessage());
						}                
					}
				}, ScanTimeout);
	}


	
	void ScanDeviceFound(ActionEvent evt)
	{
		try {
			JSONObject res = (JSONObject) evt.getSource();
			if (res.getString("status").equals("scanResult") && res.getString("name").equals("SigmaTau1")) {

					FoundDevices.add(res.getString("address"));					// add uuid to list of found devices
					String[] data = new String[Parent.FoundDevices.size()];		// covert array to list of strings
					FoundDevices.toArray(data);									
					SettingsForm_ScanListPicker.setStrings(data);				// add items to picker
					
				}
			}
		} catch (JSONException ex) {
			LogIt(ex.getMessage());
		}
	}

	

	void Connect(String uuid)
	{
		try {

			if(!Display.getInstance().isSimulator()) 
			{
				bt.connect(
					new ActionListener() 
					{
						@Override
						public void actionPerformed(ActionEvent evt) {
							ConnectCallback((JSONObject) evt.getSource());
						}    
					},uuid);
			}
		} catch (IOException ex) {
			LogIt("Connect: exception");
			LogIt(ex.getMessage());
		}
	}

	void ConnectCallback(JSONObject res)
	{
		try {
			if (res.getString("status").equals("connected")) 
			{
				Connected = true;
				
				Preferences.set("LastConnectedUUID",Parent.LastConnectedUUID);
				try {
					bt.discover(
						new ActionListener() 
						{
							@Override
							public void actionPerformed(ActionEvent evt) {
								LogIt(evt.getSource().toString());			// this has the services the device provides and other information in json

							}    
						},LastConnectedUUID);
				} catch (IOException ex) {
					LogIt("ConnectCallback:bt.discover: exception");
					LogIt( ex.getMessage());
				}
				
			}
			if (res.getString("status").equals("disconnected")) 
			{
				Connected = false;
			}
		} catch (JSONException ex) {
			LogIt("ConnectCallback exception: ");
			LogIt( ex.getMessage());
		}
	}


    void SubscriptToNotifications()
	{
		try {
            bt.subscribe(
                new ActionListener() 
                {
                    @Override
                    public void actionPerformed(ActionEvent evt) {
                        NotificationReceived((JSONObject) evt.getSource());
                    }    
                }, LastConnectedUUID, "1818", "2A63");	// Service and Characteristic
        } catch (IOException ex) {
            LogIt("SubscriptToNotifications: subscribe (exception)" + ex.getMessage() );
        }

	}


    void NotificationReceived(JSONObject res)
	{
		try 
		{
			String b64 = res.getString("value");
			if (b64.length() > 0)
			{
				try {
					byte[] decodedString = Base64.decode(b64.getBytes("UTF-8"));
					/* extract bytes here */
					
				} catch (UnsupportedEncodingException ex) {

				}
					
			}
		}
		catch (JSONException ex) {
		}
	}

	void CalibrateSetValue(int Message, int value)
	{
		byte[] array = new byte[4];		// send four btes

		
		array[0] = 0;
		array[1] = (byte)Message;
		array[2] = (byte)(value / 256);
		array[3] = (byte)(value & 0xff);
		String b64 = Base64.encode(array);
			
			try {
				bt.write(new ActionListener() 
					{
						@Override
						public void actionPerformed(ActionEvent evt) {

						}    
					}, Parent.LastConnectedUUID, "1818", "FF01", b64, false);
			}
			catch (IOException ex) {

			}
	
	}

##Credits

1. Steve Hannah - for the https://github.com/shannah/CN1JSON
2. Rand Dusing - for the https://github.com/randdusing/cordova-plugin-bluetoothle