Client sends this SNAC when wants to delete offline messages from server. 
But first you should request them from server using 
SNAC(15,02)/003C. If you doesn't delete messages 
server will send them again after client request.
  
|  00 15 | 
  | 
word | 
  | 
SNAC family | 
 
|  00 02 | 
  | 
word | 
  | 
SNAC subtype | 
 
|  00 00 | 
  | 
word | 
  | 
SNAC flags | 
 
|  xx xx xx xx | 
  | 
dword | 
  | 
SNAC request-id | 
 
 
 |  
 |  
|   | 
|  00 01 | 
  | 
word | 
  | 
TLV.Type(1) - encapsulated META_DATA | 
 
|  00 0A | 
  | 
word | 
  | 
TLV.Length | 
 
 
 |  
 |  
|   | 
|  08 00 | 
  | 
word (LE) | 
  | 
data chunk size (TLV.Length-2) | 
 
|  xx xx xx xx | 
  | 
dword (LE) | 
  | 
client uin | 
 
|  3E 00 | 
  | 
word (LE) | 
  | 
data type: delete offline msgs request cmd | 
 
|  xx xx | 
  | 
word (LE) | 
  | 
request sequence number | 
 
 
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