Specific trap type.
Options:                         
1. alarm(2)      -indicates the trap type is alarm trap.
2. maintain(3)   -indicates the trap type is maintain trap.
3. standard(4)   -indicates the trap type is snmp standard trap.
4. topo(5)       -indicates the trap type is topo trap.
5. test(6)       -indicates the trap type is test trap.
6. fault(12)     -indicates the trap type is fault alarm from alarm synchronization.
7. restore(13)   -indicates the trap type is restore alarm from alarm synchronization.
8. unrestored(14)-indicates the trap type is unrestored alarm from alarm synchronization.
9. datachange(15)-indicates the trap type is data change trap.        
          
There are two types of trap in the system:
1. Alarm trap. The alarm trap including alarms and events, options as: alarm(2), fault(12), restore(13) and unrestored(14),
only alarm trap can include hwNotificationType. 
The format of an alarm trap is as follows:  
------------------------------------------------------------------------
    | PDU Type |  RequestID | ErrorStatus | ErrorIndex | Variable-bindings |
------------------------------------------------------------------------  
The format of Variable-bindings in alarm type is as follows:
    ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
    | sysUpTime | snmpTrapOID | TrapSN | InfoLevel | Specific-trap | Agent-addr | AlarmID | AlarmSN | CauseID | Type | Time | AlmText | CauseText | userLabel | Paras... |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------
         
2. Non-alarm trap. The non-alarm trap including the maintain, test, topology and datachange trap, options as: maintain(2), standard(12), topo(13), test(14) and datachange(15). 
The format of a non-alarm trap is as follows:
------------------------------------------------------------------------
    | PDU Type |  RequestID | ErrorStatus | ErrorIndex | Variable-bindings |
------------------------------------------------------------------------    
The format of Variable-bindings in non-alarm trap is as follows:
-------------------------------------------------------------------------------------------------------------------
    | sysUpTime | snmpTrapOID | TrapSN | InfoLevel | Specific-trap | Agent-addr | TrapID | Para-0 | Para-1 | Paras... |
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