const github.com/refraction-networking/utls/dicttls.TLS_ECDHE_PSK_WITH_NULL_SHA256

one use

	github.com/refraction-networking/utls/dicttls (current package)
		cipher_suites.go#L224: 	TLS_ECDHE_PSK_WITH_NULL_SHA256               uint16 = 0xC03A