从高速公路Android Websocket客户端发送ping消息

Question

I'm using autobahn android web socket library to build my web socket client application. In order to keep the web socket connection alive for a long time, I need to periodically send ping messages from the client.

How can I do that with auotbahn android web socket library?

Answer 1

AutobahnAndroid's WebSocketWriter supports client pong messages, and AutobahnPython claims the following:

explicit processing of Pings/Pongs is unnecessary normally - AutobahnPython will do the right thing under the hood.

However, during execution of a simple chat client-server setup, I observe no such ping/pong heartbeat messages.

From what I have read, it is unclear from both the documentation and the source, what the full requirements are for enabling implicit Autobahn* heartbeats.

My personal solution involves issuing a ping from the server during onConnection and the appropriate onMesssage , and something similar to the following client code onMessage :

if (payload.equals("ping from the server"))) {
    handler.postDelayed(new Runnable() {
        @Override
            public void run() {
                myWebSocket.sendTextMessage("pong from the client");
            }
    }, 1000L);
}

... which schedules a pong response to be sent by the client, 1 second after receiving a ping from the server.

Answer 2

You can use the pull request that I just submitted

https://github.com/tavendo/AutobahnAndroid/pull/67

which adds sendPingMessage(byte[] payload) and onPongMessage(byte[] payl).