The unique device Note: It has to be 16-64 printable (non-control) ASCII characters. It also must be globally unique. Consider using vendor-MAC-ID-device-model. For example: "myEndpoint.host.com"
The secret Pre-Shared Key Note: It is not case sensitive; 4a is same as 4A, and it is allowed with or without 0x in the beginning. The minimum length of the secret is 128 bits and maximum 256 bits. For example: "4a4a4a4a4a4a4a4a4a4a4a4a4a4a4a4a"