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# TraCI/Plane SUMO ID Commands Structure

# General Structure of Plain SUMO ID Commands

All second generation API commands and its answers have the same structure which will be described here.

## Value Retrieval Commands

These commands ask SUMO about a special property value of a certain object.

### Command to SUMO

ubyte | string
variable | SUMO ID
--- | ---

The variable depends on the particular command and selects a special value. They are described in the documentation of the particular command. The SUMO ID is the ID of the object from which you want to know the value. Which type of object it belongs to depends on the particular command.

### Answer from SUMO

ubyte | string | ubyte | <return_type>
variable | SUMO ID | return type of the variable | <VARIABLE_VALUE>
--- | --- | --- | ---

Variable and SUMO ID repeat the values from the command. The return type depends on the variable and can be either a general TraCI data type described here or a special compound type for this variable which is documented with the particular command.

## State Change Commands

These commands are the opposites of the value retrieval commands above. They set a certain value of a particular object.

### Command to SUMO

ubyte | string | ubyte | <value_type>
variable | SUMO ID | type of the value | new value
--- | --- | --- | ---

Additional to variable and SUMO ID like the value retrieval commands we have a value type and the value itself similar to the answer of the value retrieval commands. The allowed types depend on the variable which itself depends on the command. See documentation of the particular command for details.

### Answer from SUMO

The answer to a state change command always consists only of the status response described here. Nothing else will be returned.

This page was last modified on 19 February 2010, at 15:50.