How to command roller shutters with Amazon Echo?

Hardware Home Automation
, ,
1

Hello,
Please help !
I have simple roller shutters motors without encoders
My .items file are :

Rollershutter 	 Kitchen_Blind   "Kitchen Blind"   (Jaluzele, camera_bucatarie) [ "Switchable" ]

My .sitemap file are:

Switch item=Kitchen_Blind label="Kitchen Blind" mappings=[UP="UP", STOP="X", DOWN="DOWN"]

My .rules file are:

rule "Kitchen Blind update"
        when
               Item Kitchen_Blind received command
        then
			var Number command = 0
			if(receivedCommand == DOWN) command = V_DOWN
			if(receivedCommand == UP) command = V_UP
			if(receivedCommand == STOP) command = V_STOP
			
			//println("update: " + command)
            sendCommand(Arduino, "120;30;1;0;24;"+ command +"\n")
end

Amazon Echo discover this device but not send up / down commands