Implement NAT discovery (RFC 5780) at the client#31
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Snowflake clients will now attempt NAT discovery using the provided STUN servers and report their NAT type to the Snowflake broker for matching. The three possibilities for NAT types are: - unknown (the client was unable to determine their NAT type), - restricted (the client has a restrictive NAT and can only be paired with unrestricted NATs) - unrestricted (the client can be paired with any other NAT).
Now when proxies poll, they provide their NAT type to the broker. This introduces a new snowflake heap of just restricted snowflakes that the broker can pull from if the client has a known, unrestricted NAT. All other clients will pull from a heap of snowflakes with unrestricted or unknown NAT topologies.
These unittests need to be updated for the new Version 1.2 messaging specification.
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Snowflake clients will now attempt NAT discovery using the provided STUN
servers and report their NAT type to the Snowflake broker for matching.
The three possibilities for NAT types are:
with unrestricted NATs)