2.2.9 POLL Packet
This packet is sent by the server on explicit instructions from the WDS Multicast Application Protocol, as specified in [MS-WDSMA]. This packet is sent on the multicast address. All clients participating in a multicast session MUST reply using a POLLACK packet (section 2.2.10).
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POLLSeqNo |
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BackOff |
AppDataLen |
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AppData (variable) |
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POLLSeqNo (8 bytes): MUST be set to an 8-byte numeric value which is incremented by 1 with every successive POLL packet. The value for the first POLL packet sent by the server MUST be set to 1.
BackOff (2 bytes): Specifies maximum time in millisecond granularity. The client MUST wait for a random time between 0 and BackOff before sending the data specified by AppData to the WDS Multicast Application Protocol, as specified in [MS-WDSMA].
AppDataLen (2 bytes): Specifies the length, in bytes, for the AppData field.
AppData (variable): Specifies the Application Data provided by the WDS Multicast Application Protocol, as specified in [MS-WDSMA]. The protocol acts solely as transport for the Application Data and MUST NOT define the structure for it.