Fix hybrid/thermal cameras misdetected as doorbells, dropping IVS events

[jaaneo]

Problem

I have a DHI-TPC-BF1241 (hybrid visual+thermal camera) alongside several regular IPC-HFW3849T1-AS-PV cameras. The regular cameras receive line-crossing/region events fine, but the hybrid camera never received any events at all, not even VideoMotion.

Root cause 1: is_doorbell() false positive

def is_doorbell(self) -> bool:
    m = self.model.upper()
    return m.startswith("VTO") or m.startswith("DH-VTO") or (
        "NVR" not in m and m.startswith("DHI")) or ...

Any model starting with DHI- (and not containing NVR) is treated as a doorbell (VTO). That's too broad - it's meant to catch doorbell models like DHI-VTO2211G-P, but it also matches regular cameras that happen to use the common DHI- prefix, like DHI-TPC-BF1241. Once misclassified, the integration opens a VTO connection on port 5000 instead of the normal event stream, which the camera doesn't support, so it silently never receives any events.

Fix: match on the VTO substring instead, which still catches VTO..., DH-VTO..., DHI-VTO..., without matching unrelated DHI- prefixed models.

Root cause 2: channel filter drops IVS events on hybrid cameras

After fixing is_doorbell(), the camera started connecting normally, but cross-line/cross-region events were still silently dropped:

if index != self._channel:
    continue

This filter exists so NVRs/DVRs - where multiple config entries (one per channel) share one event stream - can discard events meant for other channels. But the DHI-TPC-BF1241 reports CrossLineDetection/CrossRegionDetection on an internal sub-channel index (index: 1) that differs from its configured video channel (channel: 0), so this filter dropped them too, even for a single standalone entry with no channel-sharing going on.

Fix: only apply the filter when it's actually needed - i.e. when more than one config entry points at the same device address. A standalone camera (including a hybrid one with only one entry) isn't sharing its event stream with anything else, so there's nothing to filter out.

Testing

• IPC-HFW3849T1-AS-PV (regular camera, unaffected by either bug): confirmed still works and channel filtering still applies correctly since it's unaffected either way.
• DHI-TPC-BF1241 added as a single entry: confirmed is_doorbell() now returns False, event stream connects normally, and CrossRegionDetection/CrossLineDetection events arrive in the debug log with index: 1.
• DHI-TPC-BF1241 split into two entries (one per channel, e.g. visual on channel 0 and thermal on channel 1): confirmed via the recorder history that a cross-region event correctly flips only the thermal-channel entry's sensor and leaves the visual-channel entry's sensor untouched.