Implement TR-10-9 Section 15 DNS-SD browse strategy#484
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Implement TR-10-9 Section 15 DNS-SD browse strategy#484simonbaren wants to merge 1 commit intosony:masterfrom
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TR-10-9 Section 15 requires IPMX devices to:
- Support both mDNS and unicast DNS for DNS-SD browse operations
- Default to using both methods
- Provide user mechanisms to limit browsing to unicast or mDNS only
- When using both: try unicast DNS first, fall back to mDNS only
if unicast is unsuccessful (no service discovered)
- When multiple results are returned: select by best priority,
failing over to next-best if unresponsive
- Once a service is selected and responsive: perform no further
browse operations for that service type
- If the selected service becomes unresponsive: perform a new
DNS-SD browse and restart selection
Add dns_sd_browse_mode setting ("both"/"unicast"/"mdns") to implement
the required dual-discovery strategy. In "both" mode (default), unicast
DNS is tried first with half the timeout budget; if no records are
found, mDNS fallback gets the remaining half. "unicast" and "mdns"
modes restrict to a single method.
Also filters browse results by domain class to prevent mDNS results
leaking into unicast DNS queries and vice versa.
Signed-off-by: Semyon Barenboym <simonbaren@gmail.com>
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Summary
Implements the DNS-SD browse strategy required by TR-10-9 Section 15 for IPMX device service discovery.
Changes
dns_sd_browse_modesetting ("both"/"unicast"/"mdns") to control DNS-SD browse method"both"(default): try unicast DNS first with half the timeout budget; fall back to mDNS if no services found"unicast": unicast DNS only"mdns": mDNS onlyresolve_serviceto delegate toresolve_service_with the dual-discovery logicMotivation
TR-10-9 Section 15 requires IPMX devices to support both mDNS and unicast DNS for DNS-SD browse operations, defaulting to using both methods. When using both, unicast DNS must be attempted first, with mDNS as a fallback only if unicast is unsuccessful.
Files changed
Development/nmos/settings.h— newdns_sd_browse_modefieldDevelopment/nmos/mdns.cpp— dual-browse logic and domain class filteringhttps://static.vsf.tv/download/technical_recommendations/VSF_TR-10-9_v2_2025-05-13.pdf