set output [string trim $expect_out(buffer)]
        set pattern "\"Pairing Code:\".+?\"(.+?)\""
        if {![regexp -nocase $pattern $output a found]} {
            # in case not found we will return "" - no need to rise fatal because for CONFERENCE (HRS) we don't have this param in some models
            set found ""
            #fatalError "[self method]:[my getIp] can't found $envParamName"
        }

        $logger logInfo "return: $found"