diff --git a/crosspoint_reader/config.py b/crosspoint_reader/config.py
index e23a15a..2765dcf 100644
--- a/crosspoint_reader/config.py
+++ b/crosspoint_reader/config.py
@@ -5,6 +5,7 @@ from qt.core import (
     QDialogButtonBox,
     QFormLayout,
     QHBoxLayout,
+    QLabel,
     QLineEdit,
     QPlainTextEdit,
     QPushButton,
@@ -50,6 +51,12 @@ class CrossPointConfigWidget(QWidget):
 
         layout.addRow('Host', self.host)
         layout.addRow('Port', self.port)
+
+        notice = QLabel('Host and port settings are fallback values used only when the device is not auto-discoverable by UDP broadcast.')
+        notice.setWordWrap(True)
+        notice.setStyleSheet('color: gray; font-style: italic;')
+        layout.addRow('', notice)
+
         layout.addRow('Upload path', self.path)
         layout.addRow('Chunk size', self.chunk_size)
         layout.addRow('', self.debug)
diff --git a/crosspoint_reader/driver.py b/crosspoint_reader/driver.py
index 22b08d1..4dcd78f 100644
--- a/crosspoint_reader/driver.py
+++ b/crosspoint_reader/driver.py
@@ -21,7 +21,7 @@ class CrossPointDevice(DeviceConfig, DevicePlugin):
     description = 'CrossPoint Reader wireless device'
     supported_platforms = ['windows', 'osx', 'linux']
     author = 'CrossPoint Reader'
-    version = (0, 2, 0)
+    version = (0, 1, 3)
 
     # Invalid USB vendor info to avoid USB scans matching.
     VENDOR_ID = [0xFFFF]
@@ -136,7 +136,8 @@ class CrossPointDevice(DeviceConfig, DevicePlugin):
     def _http_post_form(self, path, data, timeout=5):
         url = self._http_base() + path
         body = urllib.parse.urlencode(data).encode('utf-8')
-        req = urllib.request.Request(url, data=body, method='POST')
+        req = urllib.request.Request(url, data=body, method='POST',
+                                     headers={'Content-Type': 'application/x-www-form-urlencoded'})
         try:
             with urllib.request.urlopen(req, timeout=timeout) as resp:
                 return resp.status, resp.read().decode('utf-8', 'ignore')
@@ -250,7 +251,8 @@ class CrossPointDevice(DeviceConfig, DevicePlugin):
         """
         url = self._http_base() + '/mkdir'
         body = urllib.parse.urlencode({'name': name, 'path': path}).encode('utf-8')
-        req = urllib.request.Request(url, data=body, method='POST')
+        req = urllib.request.Request(url, data=body, method='POST',
+                                     headers={'Content-Type': 'application/x-www-form-urlencoded'})
         try:
             with urllib.request.urlopen(req, timeout=5) as resp:
                 resp.read()
@@ -353,11 +355,22 @@ class CrossPointDevice(DeviceConfig, DevicePlugin):
 
 
     def delete_books(self, paths, end_session=True):
-        for path in paths:
-            status, body = self._http_post_form('/delete', {'path': path, 'type': 'file'})
-            if status != 200:
-                raise ControlError(desc=f'Delete failed for {path}: {body}')
-            self._log(f'[CrossPoint] deleted {path}')
+        import json as _json
+        self._log(f'[CrossPoint] deleting {len(paths)} books: {paths}')
+        url = self._http_base() + '/delete'
+        # Server expects form field 'paths' containing a JSON array string
+        body = urllib.parse.urlencode({'paths': _json.dumps(list(paths))}).encode('utf-8')
+        req = urllib.request.Request(url, data=body, method='POST',
+                                    headers={'Content-Type': 'application/x-www-form-urlencoded'})
+        try:
+            with urllib.request.urlopen(req, timeout=10) as resp:
+                self._log(f'[CrossPoint] delete OK: {resp.status}')
+        except urllib.error.HTTPError as exc:
+            err_body = exc.read().decode('utf-8', 'ignore') if exc.fp else ''
+            self._log(f'[CrossPoint] delete error {exc.code}: {err_body}')
+            raise ControlError(desc=f'Delete failed: {exc.code} {err_body}')
+        except Exception as exc:
+            raise ControlError(desc=f'Delete failed: {exc}')
 
     def remove_books_from_metadata(self, paths, booklists):
         def norm(p):
diff --git a/crosspoint_reader/ws_client.py b/crosspoint_reader/ws_client.py
index d87fa0b..288ef02 100644
--- a/crosspoint_reader/ws_client.py
+++ b/crosspoint_reader/ws_client.py
@@ -189,6 +189,21 @@ def _broadcast_from_host(host):
     return '.'.join(parts)
 
 
+def _local_broadcast_addrs():
+    addrs = set()
+    try:
+        for info in socket.getaddrinfo(socket.gethostname(), None, socket.AF_INET):
+            ip = info[4][0]
+            if ip.startswith('127.'):
+                continue
+            bcast = _broadcast_from_host(ip)
+            if bcast:
+                addrs.add(bcast)
+    except Exception:
+        pass
+    return addrs
+
+
 def discover_device(timeout=2.0, debug=False, logger=None, extra_hosts=None):
     ports = [8134, 54982, 48123, 39001, 44044, 59678]
     local_port = 0
@@ -210,6 +225,11 @@ def discover_device(timeout=2.0, debug=False, logger=None, extra_hosts=None):
         pass
 
     targets = []
+    for bcast in _local_broadcast_addrs():
+        _log(logger, debug, f'[CrossPoint WS] discovery subnet broadcast {bcast}')
+        for port in ports:
+            targets.append((bcast, port))
+    # 255.255.255.255 as fallback — works on Linux/Windows, silently fails on macOS
     for port in ports:
         targets.append(('255.255.255.255', port))
     for host in extra_hosts or []:
@@ -240,6 +260,9 @@ def discover_device(timeout=2.0, debug=False, logger=None, extra_hosts=None):
                 text = data.decode('utf-8', 'ignore')
             except Exception:
                 continue
+            if not text.startswith('crosspoint'):
+                _log(logger, debug, f'[CrossPoint WS] discovery ignoring non-crosspoint response: {text}')
+                continue
             semi = text.find(';')
             port = 81
             if semi != -1: