2.2.3.1 Filter-Updated PDU (OD_FILTER_STATE_UPDATED)
The Filter-Updated PDU (OD_FILTER_STATE_UPDATED) is used to inform the participants whether application filtering is enabled, as specified in section 3.2.5.1.3.
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HDR (4 bytes): The common PDU header (as specified in section 2.2.1). The Type field of the common PDU header MUST be set to ODTYPE_FILTER_STATE_UPDATED (0x0001).
Flags (1 byte): An 8-bit, unsigned char that represents a set of bit flags, in little-endian format, that indicate the state of the filter. A bit is true (or set) if its value is 1. This field MUST be composed of the bitwise OR of one or more of the following values.
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Value
Meaning
FILTER_ENABLED
0x0001
The filter is enabled. If this bit is 0 then the filter is disabled.