The ROS Master and Slave APIs manage information about the availability of topics and services for ROS, as well as the negotiation of connection transport. They are implemented using XML-RPC and come in a variety of language implementations. 

== API Listings ==

 * [[ROS/Master_API|Master API]] 
 * [[ROS/Parameter Server API|Parameter Server API]]
 * [[ROS/Slave_API|Slave API]]

== Return value format ==

Return values are lists in the format: [statusCode, statusMessage, value]

 * statusCode (int): An integer indicating the completion condition of the method. Current values:
   * -1: ERROR: Error on the part of the caller, e.g. an invalid parameter. In general, this means that the master/slave did not attempt to execute the action.
   * 0: FAILURE: Method failed to complete correctly. In general, this means that the master/slave attempted the action and failed, and there may have been side-effects as a result.
   * 1: SUCCESS: Method completed successfully.
   * Individual methods may assign additional meaning/semantics to statusCode.
 * statusMessage (str): a human-readable string describing the return status
 * value (anytype): return value is further defined by individual API calls.