BNETDocs
C>S 0x15 SID_CHECKAD
Message Id:0x15
Message Name:SID_CHECKAD
Direction:Client to Server
Used By:Diablo II, Diablo II Lord of Destruction
Diablo Retail, Diablo Shareware
Starcraft Japanese, Starcraft Broodwar
Starcraft Shareware, Starcraft Original
Warcraft II BNE, Warcraft III The Frozen Throne
Warcraft III Reign of Chaos
Format:

(UINT32) Platform ID
(UINT32) Product ID
(UINT32) ID of last displayed banner
(UINT32) Current time

Remarks

Requests ad banner information from Battle.net.

Official clients send this packet every 20 seconds (give or take). You do not have to send this at all.

In addition, Battle.net will not reply unless any of the fields above are updated from the last time you checked. If you have never checked before, Battle.net will always reply back.

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