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====== USBSerial control ======

===== Methods =====
^ Method                              ^ Description                                    ^
| USBSerial.SetOnReceive( callback )  |                                                |
| USBSerial.Start()                   |                                                |
| USBSerial.Stop()                    |                                                |
| USBSerial.Write( p1, mode )         | mode is optional, can be "US-ASCII" (vs UTF8)  |

=====Example=====
//(Example taken from the DroidScript sample section)//
<code javascript>
// Simple serial transmit example. 
// 
// Note: this application only works on devices that support  
// OTG and allow access to external serial devices. 
// 
// Known to work: Nexus7, GalaxyS3/S4, ExperiaZUltra, TescoHudl     
// Don't work: Nexus4, GalaxyS1, AsusMemo 

//Called when application is started. 
function OnStart() 
{ 
	//Create a layout with objects vertically centered. 
	lay = app.CreateLayout( "linear", "VCenter,FillXY" );	 

	//Create a button 1/3 of screen width and 1/4 screen height. 
	btn = app.CreateButton( "Press Me", 0.3, 0.25 ); 
	lay.AddChild( btn ); 
	 
	//Set function to call when button pressed. 
	btn.SetOnTouch( btn_OnTouch ); 
	 
	//Add layout to app.	 
	app.AddLayout( lay ); 
	 
	//Create USB serial object. 
	usb = app.CreateUSBSerial(); 
} 

//Called when user touches our button. 
function btn_OnTouch() 
{ 
	//Send serial text to device. 
	usb.Write( "Hello serial device!" ); 
} </code>
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