Raspberry Pi setup as bluetooth speaker

pis/start_bt_discoverable.py

@@ -0,0 +1,50 @@
+#!/usr/bin/python3
+
+import dbus
+import sys
+
+
+def mac_address_to_dbus_path(bus):
+    manager = dbus.Interface(bus.get_object("org.bluez", "/"), "org.freedesktop.DBus.ObjectManager")
+    objects = manager.GetManagedObjects()
+    result = {}
+
+    for path, interfaces in objects.items():
+        for interface, properties in interfaces.items():
+            if not interface == 'org.bluez.Adapter1':
+                continue
+            result[str(properties['Address'])] = str(path)
+    return result
+
+
+def start_discovery(bus, dbus_path):
+    # Make sure the device is powered on
+    adapter = dbus.Interface(bus.get_object("org.bluez", dbus_path), "org.freedesktop.DBus.Properties")
+    adapter.Set("org.bluez.Adapter1", "Powered", dbus.Boolean(1))
+
+    # Get the adapter interface for discovery
+    dbus.Interface(bus.get_object("org.bluez", dbus_path), "org.bluez.Adapter1").StartDiscovery()
+
+
+def set_alias(bus, dbus_path, new_alias):
+    adapter = dbus.Interface(bus.get_object("org.bluez", dbus_path), "org.freedesktop.DBus.Properties")
+    adapter.Set("org.bluez.Adapter1", "Alias", dbus.String(new_alias))
+
+
+def main():
+    mac_address = sys.argv[1]
+    device_name = sys.argv[2]
+
+    bus = dbus.SystemBus()
+    mapping = mac_address_to_dbus_path(bus)
+    try:
+        dbus_path = mapping[mac_address]
+    except KeyError:
+        print("No Device with this MAC address found")
+        exit(1)
+    set_alias(bus, dbus_path, device_name)
+    start_discovery(bus, dbus_path)
+
+
+if __name__ == '__main__':
+    main()