ui_pri communication concept service robotics group institute of system engineering and robotics...

UI_PRI Communication Concept

Service Robotics Group

Institute of System Engineering and Robotics

Bulgarian Academy of Sciences


Introduction

The primary goal of user interface communication layer is to provide flexible, reliable and network bandwidth optimized connectivity between the UI_PRI and ROS infrastructure of the Care-o-Bot robot.


Types of data:

Mapping and Navigation

Robot control & Robot Feedback (via the DM)

User Feedback on exceptions

Objects visualisation (General DB and Object DB)

Video Streams (Robot Cameras Feed)

3D data and Point Cloud Data (TBD)


Communication Structure


Rosbridge

Node that provides dynamic socket and web-socket based access to the full capabilities of ROS.

Easy access from any remote device supporting sockets and JSON via single TCP port (default 9090).

Current features and limitations: Can create ROS topics (with some restrictions of the

data types) Can publish data to ROS topics; Can subscribe and read data from ROS topics; Can call any available ROS services; Cannot create own ROS services;


Mixed Reality Server

Uses a single TCP port (default 8080)

Streams the robot camera video feeds;

Merges mapping data, robot position and objects into single consistent and time synchronized stream;

Provides easy interface to other nodes to draw information on the map via a topic;


Robot task control and communication with the Decision Making (DM) component

The user can execute any task via the DM in the UI_PRI/srs_control_task/goal

The user will be notified about the result of the task/srs_control_task/result

In case of exception/error in task execution the DM will ask the user to provide new map location, object or action

/interface_cmd


Communication with the Databases and other ROS nodes.

UI_PRI can fetch available object data form the General or Object databases via standard ROS communication.

Using flexibility of the rosbridge additional communication with other nodes is possible

Test Webinterface

A simple HTML5 webinterface was created in order to test communication path via the rosbridge and different ROS nodes functionality.

Advantages:

No compilation/installation required - as the javascript programming code is interpreted. This allows very rapid testing of different conditions

Platform independent – can be tested on varius systems and network setups

Robot Mapping & Movement

Robot Navigation andDecission making (DM) component testing


Thank You!Presented by Georgi Angelov

ui_pri communication concept service robotics group institute of system engineering and robotics...

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