dvrip: add Detect (motion detection) config wrappers

Thin wrappers `get_detect_info()` / `set_detect_info(data)` in both the
sync (`dvrip.py`) and async (`asyncio_dvrip.py`) clients for the
top-level `Detect` config path — per-channel MotionDetect /
HumanDetection (and, on multi-channel NVRs, BlindDetect / LossDetect).

The library already supported this via the generic `get_info("Detect")` /
`set_info("Detect", …)`, but the path and payload shape were undocumented.
README now carries a worked example showing the per-channel-array schema
and the sparse-merge semantics (fields omitted from a SET payload retain
their current value), plus a caveat that AlarmInfo push behaviour is
firmware-dependent — some XM builds emit events to the existing TCP
session, others only to a separately-configured `AlarmServer`, and some
do neither.

Verified on a live XM IPC unit (single-channel, hostname
IVG85HG50PYA-S-2): the canonical OpenIPC "turn motion detection on"
snippet returns `Ret: 100`, round-trip GET shows the change, sparse merge
works (`{"MotionDetect":[{"Level":4}]}` flips only `Level`).

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

README.md

@@ -460,6 +460,43 @@ cloudEnabled = False
 cam.set_info("NetWork.Nat", { "NatEnable" : cloudEnabled })
 ```
 
+## Motion detection
+
+Xiongmai cameras typically do **not** expose ONVIF `AnalyticsService`, so
+motion detection cannot be configured through ONVIF. On some firmwares it
+is also off by default. Configure it directly over the native protocol via
+the `Detect` config path:
+
+```python
+# Inspect current config (per-channel arrays)
+print(cam.get_detect_info())
+# {'HumanDetection': [{'Enable': False, ...}],
+#  'MotionDetect':  [{'Enable': True,
+#                     'EventHandler': {'RecordEnable': True,
+#                                      'AlarmOutEnable': False, ...},
+#                     'Level': 5}]}
+
+# Enable motion detection at sensitivity 5 with event-triggered recording.
+# Sparse payloads are merged — fields you omit keep their current values.
+cam.set_detect_info({
+    "MotionDetect":   [{"Enable": True,
+                        "EventHandler": {"RecordEnable": True},
+                        "Level": 5}],
+    "HumanDetection": [{"Enable": False}],
+})
+```
+
+The equivalent low-level call is `cam.set_info("Detect", ...)` — both
+shapes work; the wrapper just documents the path.
+
+Receiving the events is a separate problem. Some XM firmwares push
+`AlarmInfo` packets over the existing TCP session, so registering
+`setAlarm()` + `alarmStart()` is enough; on others the camera only emits
+to a separately-configured alarm server (see `AlarmServer.py` and the
+`EventHandler.AlarmInfo` / `MsgtoNetEnable` fields). If `setAlarm()`
+silently produces no callbacks even while recordings show motion is
+detected, the camera is likely in the latter group.
+
 ## Add user and change password
 
 ```python

asyncio_dvrip.py

@@ -580,6 +580,14 @@ class DVRIPCam(object):
             code = 1042
         return await self.get_command("Simplify.Encode", code)
 
+    async def get_detect_info(self):
+        """Read 'Detect' config: per-channel MotionDetect / HumanDetection / etc."""
+        return await self.get_info("Detect")
+
+    async def set_detect_info(self, data):
+        """Update 'Detect' config. Sparse payloads are merged with current state."""
+        return await self.set_info("Detect", data)
+
     async def recv_json(self, buf=bytearray()):
         p = compile(b".*({.*})")
 

connect.py

@@ -27,6 +27,13 @@ info["OSDInfo"][0]["OSDInfoWidget"]["PreviewBlend"] = True
 # info["OSDInfo"][0]["OSDInfoWidget"]["RelativePos"] = [6144,6144,8192,8192]
 cam.set_info("fVideo.OSDInfo", info)
 # enc_info = cam.get_info("Simplify.Encode")
+# Motion detection: turn it on and route events into recording.
+# cam.set_detect_info({
+#     "MotionDetect":   [{"Enable": True,
+#                         "EventHandler": {"RecordEnable": True},
+#                         "Level": 5}],
+#     "HumanDetection": [{"Enable": False}],
+# })
 # Alarm example
 def alarm(content, ids):
     print(content)

dvrip.py

@@ -703,6 +703,14 @@ class DVRIPCam(object):
             code = 1042
         return self.get_command("Simplify.Encode", code)
 
+    def get_detect_info(self):
+        """Read 'Detect' config: per-channel MotionDetect / HumanDetection / etc."""
+        return self.get_info("Detect")
+
+    def set_detect_info(self, data):
+        """Update 'Detect' config. Sparse payloads are merged with current state."""
+        return self.set_info("Detect", data)
+
     def recv_json(self, buf=bytearray()):
         p = compile(b".*({.*})")