2.2.1.2.1 Transport Protocol: Transport-specific Metadata
These are the values for the Transport Protocol parameter:
IP4: Denotes an IPv4 address in decimal dot notation.
IP6: Denotes an IPv6 address enclosed in square brackets according to the URL syntax for IPv6 addresses defined in [RFC2732].
TA: Denotes transport agnostic for use by receivers implemented with transport agnostic proximity detection. Any remaining values in the string will be ignored.
The following are examples of how the string MAY appear. The first example illustrates the syntax for IPv4 addresses, and the second example illustrates the syntax for IPv6 addresses. The third example illustrates the syntax for transport agnostic proximity detection:
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IP4:192.168.254.2:877 IP6:[FE80::2AA:FF:FE9A:4CA2]:877 TA:
This string MUST NOT be null terminated.