function IdRawBuildArp(AHwAddressFormat: word; AProtocolFormat: word; AHwAddressLen: byte; AProtocolLen: byte; AnOpType: word; ASenderHw: TIdEtherAddr; ASenderPr: TIdInAddr; ATargetHw: TIdEtherAddr; ATargetPr: TIdInAddr; const APayload; APayloadSize: integer; var ABuffer): boolean;