ZQ320 Throws connection exception


I am using IMz320 for our lable printing through my own build android application. My code work fine on IMZ320 but when I tried to connect to  ZQ320 printer  and oepn blue tooth connection  It throws following exception.

com.zebra.sdk.comm.ConnectionException: read failed, socket might closed or timeout, read ret: -1

I have updated my libs as well and same issue. Can someone help me please.

Best regards,