Add support for passive bluetooth scan

config/config_template.yaml

@@ -16,6 +16,7 @@ basestation:
 
   # ==== FOR V2 BASE STATIONS ONLY ====
   attempt_count_scan: 5  # Int >0. Maximum number of attempts to find Base Stations.
+  scan_type: 'active'  # Enum(active, passive). Type of bluetooth scan to use (see https://github.com/DavidRisch/steamvr_utils/issues/3#issuecomment-768580652).
 
   # ==== FOR V1 BASE STATIONS ONLY ====
   # (change the 'type' (a few lines up) to 'v1')

scripts/basestation_interface/v2_interface.py

@@ -42,7 +42,10 @@ def handleDiscovery(self, dev, is_new_dev, is_new_data):
         delegate = Delegate()
         scanner.withDelegate(delegate)
         try:
-            scanner.scan(2)
+            scanner.scan(
+                timeout=2,
+                passive=self.config.basestation_scan_type() == 'passive'
+            )
         except bluepy.btle.BTLEManagementError as e:
             log.e(e)
             if 'code: 20, error: Permission Denied' in str(e):
@@ -55,6 +58,17 @@ def handleDiscovery(self, dev, is_new_dev, is_new_data):
     sudo setcap 'cap_net_raw,cap_net_admin+eip' /home/$USER/.local/lib/python3.?/site-packages/bluepy/bluepy-helper
     see: https://github.com/IanHarvey/bluepy/issues/313#issuecomment-428324639
                     ''')
+
+            elif 'Failed to execute management command \'pasvend\'' in str(e):
+                raise RuntimeError('''
+Passive bluetooth scan failed. Consider editing your config to set basestation:scan_type to 'active'.
+Original error: {}'''.format(e))
+
+            elif 'Failed to execute management command \'scanend\'' in str(e):
+                raise RuntimeError('''
+Active bluetooth scan failed. Consider editing your config to set basestation:scan_type to 'passive'.
+Original error: {}'''.format(e))
+
             else:
                 raise e
 

scripts/config.py

@@ -51,7 +51,7 @@ def basestation_type(self):
             basestation_type = self.data['basestation']['type']
             valid_types = ['v1', 'v2', 'cmd']
             if basestation_type not in valid_types:
-                raise RuntimeError('Invalid value for basestation.type, valid options: {}'.format(valid_types))
+                raise RuntimeError('Invalid value for basestation:type, valid options: {}'.format(valid_types))
             return basestation_type
 
         return 'v2'
@@ -68,6 +68,16 @@ def basestation_attempt_count_scan(self):
 
         return 5
 
+    def basestation_scan_type(self):
+        if 'basestation' in self.data and 'scan_type' in self.data['basestation']:
+            basestation_scan_type = self.data['basestation']['scan_type']
+            valid_types = ['active', 'passive']
+            if basestation_scan_type not in valid_types:
+                raise RuntimeError('Invalid value for basestation:scan_type, valid options: {}'.format(valid_types))
+            return basestation_scan_type
+
+        return 'active'
+
     def basestation_attempt_count_set(self):
         if 'basestation' in self.data and 'attempt_count_set' in self.data['basestation']:
             return int(self.data['basestation']['attempt_count_set'])
@@ -84,7 +94,7 @@ def basestation_mac_address(self, mode):
             if len(self.data['basestation'][field_name]) > 0:
                 return self.data['basestation'][field_name]
 
-        raise RuntimeError('Value basestation.{} must be set when using V1 Base Stations'.format(field_name))
+        raise RuntimeError('Value basestation:{} must be set when using V1 Base Stations'.format(field_name))
 
     def basestation_id(self, mode):
         if mode not in ['b', 'c']:
@@ -96,7 +106,7 @@ def basestation_id(self, mode):
             if len(self.data['basestation'][field_name]) > 0:
                 return self.data['basestation'][field_name]
 
-        raise RuntimeError('Value basestation.{} must be set when using V1 Base Stations'.format(field_name))
+        raise RuntimeError('Value basestation:{} must be set when using V1 Base Stations'.format(field_name))
 
     def basestation_command(self, target):
         if target not in ['on', 'off']: