Function libzt::zts_init_allow_secondary_port

pub unsafe extern "C" fn zts_init_allow_secondary_port(allowed: c_uint) -> c_int

@brief Allow or disallow ZeroTier from automatically selecting a backup port to help get through buggy NAT. This is enabled by default. This port is randomly chosen and should be disabled if you want to control exactly which ports ZeroTier talks on and (iff) you know with absolute certainty that traffic on your chosen primary port is allowed. This is an initialization function that can only be called before zts_node_start().

@param port Port number @return ZTS_ERR_OK if successful, ZTS_ERR_SERVICE if the node experiences a problem, ZTS_ERR_ARG if invalid argument.