2.2.3.1 Incoming Data PDU (MSG_SNDIN_DATA_INCOMING)
The Incoming Data PDU is sent by the client to indicate that the next packet sent MUST either be a Data PDU or a Sound Formats PDU. This PDU is used for diagnostic purposes. The time used to transmit a Data PDU/Sound Formats PDU can be found out by comparing the time between receiving a Data PDU/Sound Formats PDU and receiving an Incoming Data PDU. The server MAY use this time and the data size of a Data PDU/Sound Formats PDU to calculate how fast the network is transmitting data. The result of this calculation MAY then be used to determine the audio format to use.
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Header (1 byte): An SNDIN_PDU header (section 2.2.1). The MessageId field of the SNDIN_PDU header MUST be set to MSG_SNDIN_DATA_INCOMING (0x05).