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Command: assign-id
Assign new ID to client, or fetch current ID
Purpose: assigning ID to clients so server can respond to that client
Compulsivity: manditory (core infrastructure)
More documentation: doc/messages
Reference implementation: mds-server
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Command: intercept
Sign up for reception of message
Optional header: Stop
Stop reception of messages if `yes`
Optional header: Priority
Signed 64-bit integer of reception priority (reversed of order)
Optional header: Modifying
Send message asynchronously and await modification if `yes`
Optional header: Length
Length of the message
Message: list of headers and header–value-pairs that qualifies
a message for reception, all messages qualifies if this
list is empty
Purpose: filter received message for clients and servers
Purpose: assigned interception order for modification of messages
Compulsivity: manditory (core infrastructure)
More documentation: doc/messages
Reference implementation: mds-server
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Command: echo
Echo back a message
Required header: Client ID
Your ID, provided by `ID assignment`
in response to `Command: assign-id`
Optional header: Length
Length of the message
Message: message to echo
Purpose: debugging and testing
Purpose: network heartbeat
Compulsivity: recommended for network enabled servers
Reference implementation: mds-echo
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Command: register
Register availability of a command for which you implement a service
Required header: Client ID
Your ID, provided by `ID assignment`
in response to `Command: assign-id`
Conditionally required header: Length
Required if: `Action: list`
Length of the message
Optional header: Action
Remove availability for registry if `remove`.
Wait until listed commands are available if `wait`.
Send a list of availability commands if `list`.
Message: List of values for the header `Command` that you implement
Purpose: Identify supported display server operations
Purpose: Initialisation process synchronisation
Compulsivity: highly recommended (infrastructure), programs may
stall a bit from time to time without it, or at
initialisation depending on the program's implementation
Reference implementation: mds-registry
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