The data field of the SNMP message contains the SNMP PDU. For example, an SNMP get-request PDU is defined as follows:SNMP-Message ::= SEQUENCE { version INTEGER { version-1 (0)}, community OCTET STRING, data ANY }
GetRequest-PDU ::= [0] IMPLICIT SEQUENCE { request-id RequestID, -- 4 byte integer to match requests and responses error-status ErrorStatus, error-index ErrorIndex, -- both single byte integers, = 0 in requests, error status in responses variable-bindings VarBindList -- list of desired object identifiers as name/value pairs