ST2110PtpClock.domainNumber property

PTP domain number (0—​127). SMPTE 2059-2 typically uses 127. Defaults to 127. Surfaces in the outgoing SDP ts-refclk:ptp=<version>:<gmid>:<domain>. MTL auto-detects the domain from incoming PTP messages on the wire, so this field is descriptive — set it to whatever your grandmaster advertises.

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