Based on PCAP analysis of official Mi Home app traffic:
- Official app sends PING every ~1 second
- Previous 5-second interval was too slow, causing connection resets
Simply reduce keepalive timeout from 5s to 1s.
Based on PCAP analysis of official Mi Home app traffic, the keepalive
mechanism was incorrect:
Before (broken):
- Sent PING every 5s only when receiving data
- Responded to PING with PONG
After (fixed):
- Send PING every 1 second independently via dedicated goroutine
- Don't respond to PING with PONG (official app doesn't either)
- Both sides send PING bidirectionally as heartbeats
The official app sends 199 PING messages and 0 PONG messages in a
typical session. This fix matches that behavior.
Fixes connection resets after prolonged streaming sessions with
Xiaomi cameras using the CS2 P2P protocol.
Johnnybyzhang
Alex X