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K2 Edge Protocol Manual – document version 1.0 – Page 11

4.3. The exid field

The

exid

field in the command string is a mandatory field. This field is reserved for defining a unique

external ID, numeric or

alphanumeric, for

each command. (An easy way to implement this is to use a 32-

bit or 64-bit integer counter and increment the counter value for each new command.) The

exid

field and

value are guaranteed to be left untouched and are returned in the feedback. Using the

exid

field value

found in feedback messages from nexos, it is easy to associate the feedback message with the original

command, which is especially useful when nexos is working on several commands simultaneously.

Keep following rules in mind:

• The exid field is mandatory for all sub commands.

• The

exid

value format is under control of the initiator (numeric, alpha or mixed).

• The

exid

value must be unique for each new command sent to nexos.

• The

exid

field and value are guaranteed to be left untouched and returned through feedback

messages.

• The exid field value is the only way to link feedback messages generated by nexos back to the

original command.

4.4. The inst field

When nexos receives a command to preload a template for playback, a temporary instance of this

template is created. The instance lifetime covers the preload- and playback phase, the instance will

automatically be removed when playback is finally stopped. Each template instance needs a unique

identifier so that commands can address it.

For example: sub command

preload

is used to preload a template instance with instance ID value X;

the following play sub command must specify the same identifier value X, so nexos can locate the

instance. The

inst

field defines a unique template instance identifier value.

Keep following rules in mind:

1. The

inst

field is mandatory for the following sub commands: preload-play, preload and play.

2. The

inst

field value format is numeric.

3. For each preload or preload-play command, a unique

inst

field value must be defined, since

each time these commands are issued a new template instance is created.

4. Note that when working with the preload and play commands (instead of preload-play), the field

values for the play and preload commands must be identical, since both commands will refer to

the same template instance.

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