# NVR HiWatch DS-N316(D) Fix Progress

## Problem
All 13 XM cameras (53H20AF) cycle online/offline every ~30 seconds on NVR.
NVR IP: 192.168.1.123, FW: V4.76.015 build 250210
Network: 192.168.1.x (Знаменское, через Cudy router 100.70.54.204 Netbird)

## Camera List
1:192.168.1.42, 2:192.168.1.69, 3:192.168.1.101, 4:192.168.1.40, 5:192.168.1.64
6:192.168.1.70, 7:192.168.1.20, 8:192.168.1.58, 9:192.168.1.57, 10:192.168.1.56
11:192.168.1.63, 12:192.168.1.47, 13:192.168.1.41

## Key Discovery: DVR-IP Protocol Works!
- XM camera admin password: empty (""), XM hash: tlJwpbo6
- Login: EncryptType=MD5, PassWord=tlJwpbo6, UserName=admin, port 34567
- msg_id 1000=login, 1042=config_get, 1040=config_set
- TCPMaxConn: 10 (connection limit theory WRONG)
- RTSP accepts ANY auth (Basic, no auth, wrong creds) — auth NOT the issue

## What Was Tried & Failed
- Disabling sub-stream (VideoEnable=false) → NVR still tries stream 102, gets accessFroDeviceStreamFailure
- Anonymous RTSP (Anonymity=true) → still cycles
- HIKVISION protocol → online=true but no video (can't get device params)
- Custom Protocol → badXmlContent (400)
- streamType=main → NVR returns 400 (only "auto" supported)
- PUT /ISAPI/Streaming/channels → notSupport
- ONVIF DeleteProfile → camera ignores
- SetVideoEncoderConfiguration → camera closes connection
- Different passwords → no effect
- MTU change → no effect

## Current NVR State
- CH1 still has 192.168.1.42 configured (camera is FROZEN — ports closed, pings OK, needs power cycle)
- All other 12 cameras are alive

## Root Cause Investigation
- NVR error: accessFroDeviceStreamFailure (stream access fails)
- RTSP DESCRIBE works fine from client (200 OK)
- Camera accepts any RTSP auth
- Issue may be in SETUP/PLAY phase or RTP transport
- NVR does ONVIF → gets RTSP URL → tries DESCRIBE/SETUP/PLAY → fails after ~20-30s

## SSH Tunnels Pattern
```bash
ssh -o StrictHostKeyChecking=no -o ConnectTimeout=10 -o ServerAliveInterval=10 -L LOCAL:REMOTE_IP:REMOTE_PORT root@100.70.54.204 -N -f
```

## Key Scripts
- /root/nvr_clean_test.py — full test: DVR-IP config + NVR add + monitor
- /root/xm_full_explore.py — explore camera settings via DVR-IP
- /root/xm_disable_substream.py — disable/enable sub-stream
- /root/xm_fix_rtsp.py — change RTSP anonymity settings

## Next Steps
1. Do full RTSP session (SETUP+PLAY) to verify stream actually works
2. Check if NVR uses TCP or UDP for RTP transport
3. Maybe try adding camera with empty password ("12345678" - 8 char minimum for NVR)
4. Consider: maybe NVR ONVIF GetStreamUri returns different URL than direct ONVIF query
5. Camera 192.168.1.42 needs physical power cycle