nl_tokens: The PDU contains the SNMP request or response fields and a list of VarBinds .
pl_tokens: function PDU ( ) { this . type = asn1ber . pduTypes . GetRequestPDU ; this . reqid = 1 ; this . <mask> = 0 ; this . errorIndex = 0 ; this . varbinds = [ new VarBind ( ) ] ; }