> *Refer to* [*README*](../README.md) *for main instruction file*
 
 # MCOP - MCPTT App Development
 
 ## What is MCOP?
 
 **MCOP** (Mission Critical Open Platform) is a project that defines the first prototype of open source **MCPTT** (Mission Critical Push-To-Talk) client.
 
 This client allows the interoperability among different vendors thanks to a multilevel API.
 
 ## Architecture
 
 Three main modules define the architecture: 
 
 * **MCOP SDK**:
 
 	This module contains all the MCPTT logic, and allows the use of other additional modules that increase its functionality. 
 
 * **MCOP Integration Plugins**:
 
 	Additional modules or Android services with their own API, known by the MCOP SDK module, offering device specific or MCPTT network required functionalities. 
 
 * **End User Interface**:
 
 	GUI (Graphical User Interface) that uses the MCOP SDK services without having to develop the whole MCPTT logic. *(Min. level of Android SDK: API 17)*.
 
 ![ThreMainModules](../images/threemainmodules.png)
 
 ## App Developing Steps
 
 * **0. MCOP SDK and AIDLs**: The SDK defines two AIDLs and one Constant class:
 
 	* **IMCOPsdk**: From Client to SDK.
 
 	* **IMCOPCallBack**: From SDK to Client.
 
 	* **ConstantsMCOP**: defines the constants to use in the AIDLs.
 
 * **1. Configure Manifest**: Indicate the necessary permissions for the application.
 
 		<uses-permission android:name="android.permission.INTERNET" />

     	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
     	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     	<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
     	<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
     	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     	<uses-permission android:name="android.permission.CAMERA" />
     	<uses-permission android:name="android.permission.WAKE_LOCK" />
     	<uses-permission android:name="android.permission.RECORD_AUDIO" />
     	<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
     	<uses-permission android:name="android.permission.VIBRATE" />
     	<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
     	<uses-permission android:name="android.permission.WRITE_SETTINGS" />
     	<uses-permission android:name="android.permission.DISABLE_KEYGUARD" />
     	<uses-permission android:name="android.permission.READ_CONTACTS" />
     	<uses-permission android:name="android.permission.WRITE_CONTACTS" />
     	<uses-permission android:name="android.permission.READ_PHONE_STATE" />
     	<uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS" />
     	<uses-permission android:name="android.permission.CALL_PHONE" />
     	<uses-permission android:name="android.permission.RAISED_THREAD_PRIORITY" />
     	<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     	<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

 
 * **2. Require the explicit acceptance of some of the permissions.**
 
 	The client should explicitly accept some permissions:
 
 	* Manifest.permission.ACCESS\_FINE\_LOCATION
 
 	* Manifest.permission.READ\_PHONE\_STATE
 
 	* Manifest.permission.ACCESS\_COARSE\_LOCATION
 
 	* Manifest.permission.CAMERA
 
 	* Manifest.permission.RECORD\_AUDIO
 

 		![Allow audio](../images/images_allow1RecordAudio.png)

 
 * **3. Bind to MCOP SDK**:
 
 	In this version of MCOP SDK, it is necessary to send **“currentProfile”** to the service:
 
 		Intent serviceIntent = new Intent()
 			.setComponent(new ComponentName(
 				"org.mcopenplatform.muoapi",
 				"org.mcopenplatform.muoapi.MCOPsdk"));

 		serviceIntent.putExtra("PROFILE_SELECT",currentProfile);
 		

 		try{
                 ComponentName componentName;
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                     componentName = this.startForegroundService(serviceIntent);
                 } else {
                     componentName = this.startService(serviceIntent);
                 }
                 if(componentName==null){
                     Log.e(TAG,"Starting Error: "+componentName.getPackageName());
                 }else if(serviceIntent==null){
                     Log.e(TAG,"serviceIntent Error: "+componentName.getPackageName());
                 }else if(mConnection==null){
                     Log.e(TAG,"mConnection Error: "+componentName.getPackageName());
                 }else{
 
                 }
             }catch (Exception e){
                 if(BuildConfig.DEBUG)Log.w(TAG,"Error in start service: "+e.getMessage());
             }

 
 	Wait for the service to bind:
 
 	* Save the return value from the Service (this is the AIDL Interface to be used by the Client to communicate with the Service).
 
 	* Register the callback for asynchronous communication from the Service to the Client:
 
 			mConnection = new ServiceConnection() {
 			
 			@Override

                 public void onServiceConnected(ComponentName className, IBinder service) {
                     mService = IMCOPsdk.Stub.asInterface(service);
 
                     try {
                         mService.registerCallback(mMCOPCallback);
                     } catch (RemoteException e) {
                         e.printStackTrace();
                     }
                     isConnect=true;
 
                     // Auto Registration
                     if (autoRegister) {
                         final Handler handler = new Handler();
                         handler.postDelayed(new Runnable() {
                             @Override
                             public void run() {
                                 register();
                             }
                         }, DEFAULT_REGISTER_DELAY);
                     }
                 }

 
 	* Definition of the registered callback:
 
 		* This is the point where communications from the Server to the Client will be received:
 
 				mMCOPCallback=new IMCOPCallback.Stub() {
 					@Override
 					public void handleOnEvent(final List<Intent> actionList) throws RemoteException {
 						runOnUiThread(new Runnable() {
 							@Override
 							public void run() {
 								for(Intent action:actionList){
 									int codeError=-1;
 									int eventTypeInt=-1;
 									String stringError=null;
 									String sessionID=null;
 									if(action!=null &&
 										action.getAction()!=null &&
 										!action.getAction().trim().isEmpty())
 											try {
 												switch (ConstantsMCOP.ActionsCallBack.fromString(action.getAction())){
 												...
 												}
 											}catch (Exception ex){
 												Log.e(TAG,"Event Action Error: "+action.getAction()+" error:"+ex.getMessage());
 											}
 									}
 								}
 							});
 						}
 					};
 
 
 * **4. Perform any action in the MCOP SDK and receive the result**.
 
 	Example:
 
 		if(mService!=null)
 			mService.makeCall(
 				selGroup, //DEFAULT_GROUP,
 				ConstantsMCOP.CallEventExtras.CallTypeEnum.Audio.getValue()|
 				ConstantsMCOP.CallEventExtras.CallTypeEnum.WithFloorCtrl.getValue()| 
 				ConstantsMCOP.CallEventExtras.CallTypeEnum.PrearrangedGroup.getValue()
 			);