Ensure that the current working directory is the root directory of the project.

Generate an APP key by SHA3-256 for the device.

Generate a random runtime code.

Generate a serial number by uuid v4 and custom rule(24 bits + 5 bits(-)).

Get the private key bytes from the local file.

Check if the given data is all not empty except the excluded fields.

Overwrite the default logger of Gin Framework.

Sign the given message with specified hashing method.

Convert the time unit string to time.Duration.

Gracefully shutdown the server.

The buffer for testing mode.