Exchange of messages between agents

Up:Tutorial?　　　 　Previous：Humanoid agent operations　　　　　Next：Vision sensor

---

Exchange of messages between agents. †

※This tutorial is valid only for later than v2.1.0.

Sending and receiving messages †

Controller of message sender †

Create a controller for sending messages.

$ cd ~/MyWorld
$ emacs SendController.cpp

This controller send a message "Hello!" to the robot agent every second.

If you want to send a message to all of the agents in the world, you should use broadcastMsg instead of sendMsg.

Old

New

Controller to receive messages †

Create a controller to receive messages.

$ emacs RecvController.cpp

This controller put the agent's hand up if a message "Hello!!" comes. The agent will put the hand down every 0.5 second.

Compiling the controller.

$ ./sigmake.sh SendController.cpp RecvController.cpp

Creating a worldfile †

$ emacs MessageWorld.xml

In this controller, a human avator will send a message to a humanoid agent.

Execution †

$ sigserver.sh -w ./MessageWorld.xml 

First, the avatar agent put a hand down and turn back by onInit function. Then, you can see that the agent put it's hand up every second with receiving a message.

Specification of message reachable area †

This part explains how to specify the maximum length of the reachable area of the message sending function.

Controller of text message sender †

Create another controller to send messages.

$ emacs SendController2.cpp 

SendController2.cpp

The second argument of the broadcastMsg, 300, means that the maximum distance of the message reachable area is 3 meters. If you omit the secnod argument, the message will be reached to all of the agents irrespective of the distance.

This agent keeps on sending a message and moving to z-axis.

Compiling †

$ ./sigmake.sh SendController2.cpp

Modification of the world file †

$ emacs MessageWorld.xml

Modify the MessageWorld.xml to change the controller for sending agent

Old

New

Execution †

$ sigserver.sh -w ./MessageWorld.xml

You can see the agent sending messages with backing away from the receiver. Please check how far the message reaches to the receiver.

Sending message to the SIGViewer †

If the broadcastMsg is used, the message will be reached to all of the agents, SIGViewer and SIGVerse services. The SIGViewer will show the received message as log message.

You can send messages to the SIGViewer using sendMsg. In this case, you should specify a service name which is determined when the SIGViewer connected to the SIGverse server. If the service name is "SIGViewer", the following modification will change the sending target from the agent to the SIGViewer.

SendController.so

Old

New

Up:Tutorial?　　　 　Previous：Humanoid agent operations　　　　　Next：Vision sensor