Yes, it was permissions problem. I've added the following lines to the 
manifest -
<uses-library android:name="com.android.future.usb.accessory" 
android:required="false" />
<intent-filter>
                <action 
android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED" />
</intent-filter>
<meta-data 
android:name="android.hardware.usb.action.USB_ACCESSORY_ATTACHED" 
android:resource="@xml/accessory_filter" />
(and of course the accessory_filter.xml at the res directory), but it did 
not help.
Only when I've added the internet and bluetooth permissons it worked, 
although I use neither of them. Can you explain it to me?
But anyway, I've just turned on a LED via SMS, after so many trials! I'm so 
happy:)

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