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UART mutual authentication test
This test creates a (D)TLS server and a client on one device and checks if they can perform a TLS handshake and exchange a message. The test uses UART as the physical layer of communication channel and, since it runs on a single ESP32, it expects two UART ports interconnected as per below:
+------------------------+
| ESP32 |
| |
| UART-1 UART-2 |
+---25---26------4---5---+
| | | |
| +-------+ |
+----------------+
The test runs in two configurations: TLS and DTLS.