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Abtin Keshavarzian
a40b42e299
This commit adds new network data service entry definitions to indicate presence of DNS/SRP servers within the Thread mesh and provide info about them. Two service TLV formats are added: `NetworkData::Service::DnsSrpAnycast` indicates that DNS/SRP client on a device can use the associated anycast address with this service TLV to reach the DNS/SRP server. The use of anycast address ensures that the messages are routed to the nearest node which has added such a service entry in the network data. The service TLV data in this model contains a one byte sequence number which is used to notify the SRP clients if they need to re-register with the server(s) (e.g., due server reset/reboot and/or loss of previous registrations). `NetworkData::Service::DnsSrpUnicast` directly provides the IPv6 address and port info for a DNS/SRP server which can be included as part of the service TLV data and/or the server TLV data. Using service TLV data allows the info about a common infrastructure SRP/DNS server to be added by multiple BRs. In the case of server TLV, the IPv6 address info can be optionally omitted (i.e. just a port number is provided) which then causes the associated RLOC/ALOC address of the node who added the service entry to be used as the server's IPv6 address. This commit updates the `Srp::Client` to use the new service entries to discover/select the SRP sever when auto-start mode is enabled. The client prefers and uses a `DnsSrpAnycast` over `DnsSrpUnicast` entries. The `Srp::Server` is also updated to publish its info as `DnsSrpAnycast` entry (using mesh-local address). This commit also updates the `test_network_data` unit test to cover the behavior of newly methods which iterate and parse different service entry formats.