document websocket connection heartbeat interval

[Bryan Stitt]

I am using python's aiohttp library to handle websockets instead of your typescript library because I am just building a quick prototype and I know python better than javascript/typescript.

I have the subscribe command working and returning a bunch of orders, but 60 seconds after connecting, I get an error about an unclosed client session.

After some tinkering, I realized that I need to enable heartbeats to keep the connection alive. I changed my command to be async with http_session.ws_connect(relay_url, heartbeat=30) as ws:.

Heartbeats being necessary (and their recommended interval) should probably be added to the docs.

[Brandon Millman]

@wysenynja which API are you connected to?

[Bryan Stitt]

RadarRelay.

Side note: is there a list of all the public open relays somewhere?