The original headline is: "MMT Killed My WebSocket Every 5 Minutes — A 6-Character Fix"

Short summary

A crypto trading engine's WebSocket feed from MMT kept dying every 5 minutes due to a keepalive interval set to 10 minutes—longer than the server's 300-second idle timeout. Changing one constant from 10 to 4 minutes fixed the silent 1011 read_error disconnections. The lesson: always know your provider's idle timeout and set keepalive intervals with margin below it.

• •WebSocket died every 5 minutes because keepalive fired at 10 min, exceeding server's 300s idle timeout
• •Fix was changing one constant: 10 min to 4 min keepalive interval
• •Key lesson: keepalive must be shorter than server timeout, with margin

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