Type of Application Message Request being made.
| 0 | = | Retransmission of application messages for the specified Applications | Added EP63
| | [Retransmission] |
| 1 | = | Subscription to the specified Applications | Added EP63
| | [Subscription] |
| 2 | = | Request for the last ApplLastSeqNum published for the specified Applications | Added EP63
| | [RequestLastSeqNum] |
| 3 | = | Request valid set of Applications | Added EP63
| | [RequestApplications] |
| 4 | = | Unsubscribe to the specified Applications | Added EP63
| | [Unsubscribe] |
| 5 | = | Cancel retransmission | Added EP78
| | [CancelRetransmission] |
| 6 | = | Cancel retransmission and unsubscribe to the specified applications | Added EP78
| | [CancelRetransmissionUnsubscribe] |