WebSocket Ping/Pong

[Martin Konecny]

Hi,

I'm trying to implement a system where the client WebSocket sends a ping, and receives a pong. This wasn't working so I took a look through the source code. It appears the module supports only sending pings, and not responding to a ping with a pong.

I also noticed that if the client sends a message after enabling "push_stream_websocket_allow_publish", then the module will send back two messages after the client writes to it: an echo of the original message as well as a ping.

I'm thinking of implementing a PING/PING  echo system simply by keeping "push_stream_websocket_allow_publish" enabled and writing messages from the client, and waiting for the module to echo it back.

Are there any caveats or side-effects I should be wary about by enabling "push_stream_websocket_allow_publish" ? Can this be abused by clients for other purposes than an echo?

[Martin Konecny]

It looks like I misinterpreted the purpose of "push_stream_websocket_allow_publish", as it looks like it will publish to other websockets users as well.

Would be nice to have PONG response have a PING from the client as I believe the client is usually the receiver, and it's difficult for the client to know whether the connection is still active if the client doesn't send anything.

[Wandenberg Peixoto]

Hi Martin,

can you give a try to websocket_improvments branch.

It already implement the PONG response to a PING message, and other things.

Kind regards,

Wandenberg

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