Handling Exchange WebSocket Data and Reconnection in FMZ
Summary
This guide explains how to use FMZ’s Dial function to connect to cryptocurrency exchange WebSocket feeds, subscribe to channels, read messages, and manage multiple connections. It contrasts WebSocket streams with REST calls, noting the potential advantages of lower latency and fewer REST rate-limit constraints alongside interruptions and less straightforward handling. The examples describe compressed feeds, automatic or manual reconnection, and different read behaviors for queued, latest, or nonblocking messages.
For multiple exchanges, the guide recommends polling each connection without blocking so one quiet feed does not prevent processing another. It also suggests watching for stale updates and periodically comparing stream data with REST responses, since a heartbeat alone may not guarantee that useful market data is arriving. An event-driven framework can process incoming ticks while limiting trade and account-query frequency. The article is implementation guidance, not a trading strategy or performance study; exchange protocols and message formats vary, and the code examples are illustrative rather than a universal connector.
Key ideas
- WebSocket streams can provide lower-latency market updates, but they can disconnect and require careful handling.
- Choose read behavior based on whether the strategy needs queued history or only the newest quote.
- Poll multiple connections without blocking so data from one venue does not stall another.
- Monitor update freshness and compare stream values with REST data when checking for stale or inaccurate feeds.
- Limit trading and account requests in event-driven loops to control request frequency.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.