3.9 Request Device Topology
Sent by a client to a ENCODER device in order to obtain the set of USB devices in the system. A
DECODER device will send a Negative Acknowledge message in response to this message.
Byte Offset
+-----------------------------------------+-----------------------------------------+
0 | Magic Number |
+ +
2 | |
+-----------------------------------------+-----------------------------------------+
4 | Message ID |
+ +
6 | |
+-----------------------------------------+-----------------------------------------+
8 | Protocol Version = 3 | Command = 4 |
+-----------------------------------------+-----------------------------------------+
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