Communication protocol

Message type

Field	Type	Comment
ULID	String	Unique identifier
CMD	Enum	Command
Params	String	Parameters for the command
Result	String	Command result
Data	String	Extra field for commands or resutls
Error	Boolean
ErrorMsg	String	Error message

Communication protocol

     Endpoint                                           Server

                  ULID: Nil, CMD: Register
        +------------------------------------------------>
                                                         |
                                                         | Register and
                  ULID: ulid, Result: OK                 | Generate ULID
        <------------------------------------------------+


                  ULID: ulid, CMD: Ping
        +------------------------------------------------>
                                                         |
                                                         | Check schedule
                  ULID: ulid, CMD: Ping, Result: Pong    |
        <------------------------------------------------+


                  ULID: ulid, CMD: Ping
        +------------------------------------------------>
                                                         |
                                                         | Check schedule
                  ULID: ulid, CMD: Scan, Data: Rules     |
        <------------------------------------------------+
        |         ULID: ulid, CMD: Ping
        |
        +------------------------------------------------>
Execute |         ULID: ulid, CMD: Ping, Result: Pong    |
command |<-----------------------------------------------+
        |
        |         ULID: ulid, CMD: Scan, Result: Result
        +------------------------------------------------>
                                                         |
                                                         | Update report
                  ULID: ulid, CMD: nil, Data: ACK        |
        <------------------------------------------------+

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