# File lib/net/snmp.rb, line 125
        def initialize args={}
            @version = args[:version] || 0
            @community = args[:community] || "public"
            @pdu_type = args[:pdu_type] # leave nil unless specified; there's no reasonable default value.
            @error_status = args[:error_status] || 0
            @error_index = args[:error_index] || 0
            @variables = args[:variables] || []
        end