auryan898/Remote-Gamepad-Control-MQTT

Remote Gamepad Control (Using MQTT)

In this repository, there are three files to pay attention to: RemoteGamepadServer.java, RemoteGamepadClient.java, and TestRemoteServerClient.java

• RemoteGamepadServer.java runs on a PC (tested on Windows) and depends on EV3-Gamepad-Control and Eclipse Paho (website , jar).
  It provides a utility to send the input data to MQTT from GameController instances of EV3-Gamepad-Control.

• RemoteGamepadClient.java runs on a client, and depends only on Eclipse Paho (website, jar)
  It provides a utility to read the gamepad input data sent by RemoteGamepadServer.java and store it into a HashMap for later usage.

• TestRemoteServerClient.java is an example code using both client and server at the same time, assuming that your MQTT server is running on your current device at tcp://127.0.0.1:1883

Installation

You'll need to create an MQTT server, such as this one, mosquitto

Download for usage: RemoteGamepadServer.java and RemoteGamepadClient.java onto the server and client respectively.
All source java files can be downloaded and extracted from the Latest Release.
On server-side, the jar itself can be imported as a dependency. It can be imported client-side, but this is untested.

Both server and client need to include Eclipse Paho (website , jar)
Only the server requires EV3-Gamepad-Control as a dependency.

Client-side Usage

This example code is from TestRemoteServerClient.java. First, we setup a RemoteGamepadClient named ryan's pc listening for
the controller data at player1, using the MQTT server at tcp://127.0.0.1:1883. Then the stored data can be accessed any way you like,
for example, printing out the data in a while loop:

RemoteGamepadClient client = new RemoteGamepadClient("ryan's pc", "player1", "tcp://127.0.0.1:1883");
client.start(); // start listening for data sent

while (true) {
    // Access data by calling this HashMap ->
    System.out.println(client.getGamepadValues());
    try {
        Thread.sleep(20);
    } catch (InterruptedException e) {
      // TODO Auto-generated catch block
      client.disconnect();
      e.printStackTrace();
      break;
    }
}

Server-side Usage

This example code is from TestRemoteServerClient.java.

First get the game controller manager and some gamepad controllers to go with it:

manager = GameControllerManager.getInstance();
PhysicalGameController p1 = manager.getPhysicalController(0);
PhysicalGameController p2 = manager.getPhysicalController(1);
AssignableGameController player1 = manager.getAssignableController(new BaseGamepadKeyMapper(),
    "start", "a_button");

Then make a display and show those controllers on the pc screen:

display = new GameControllerDisplay();
display.init();
display.addController(p1);
display.addController(p2);
display.addController(player1);

Now we create the gamepad server and add a controller, with a name (used by gamepad client to read data):

server = new RemoteGamepadServer("tcp://127.0.0.1:1883");
server.addController("player1", player1);
server.connect(); // connect to the mqtt server

Finally, we start an update loop, that udpates the controllers and publishes gamepad data:

while (true) { // this can run in another thread
  try {
    manager.update();
    display.update();
    server.publishAllControllerData();
    Thread.sleep(100);
  } catch (InterruptedException | MqttException e) {
    try {
      server.disconnect();
    } catch (MqttException e1) {
      e1.printStackTrace();
    }
  } finally {
    break;
  }
}