Add native Linux controls and tray menu for BTD 700

btd700/demo.py

@@ -0,0 +1,37 @@
+"""Explicit, isolated demonstration device; never opens USB."""
+from .protocol import Command as C, encode
+
+
+class DemoTransport:
+    def __init__(self):
+        self.events = {}
+        self.values = {C.GET_STATE: b'\x03', C.GET_MODE: b'\0\3\1',
+            C.GET_CODECS: b'\x0f', C.GET_CODEC: b'\4', C.GET_LE_STATE: b'\1',
+            C.GET_QUALITY: b'\2\2', C.GET_TRANSPORTS: b'\1',
+            C.GET_BROADCAST: b'\1\2\0', C.GET_NAME: b'BTD700 Demo'+bytes(21),
+            C.GET_KEY: bytes(16), C.GET_VERSION: b'\3\x0b\0'}
+
+    def request(self, command, payload=b''):
+        encode(command, payload)
+        if command in self.values:
+            return self.values[command]
+        if command == C.SET_MODE:
+            self.values[C.GET_MODE] = payload + b'\1'
+        elif command == C.SET_CODEC:
+            self.values[C.GET_CODEC] = payload
+        elif command == C.SET_CONNECTION:
+            self.values[C.GET_STATE] = b'\2' if payload[0] else b'\1'
+        elif command == C.SET_BROADCAST:
+            self.values[C.GET_BROADCAST] = payload
+        elif command == C.SET_NAME:
+            self.values[C.GET_NAME] = (payload or b'BTD700 Demo').ljust(32, b'\0')
+        elif command == C.SET_KEY:
+            self.values[C.GET_KEY] = payload.ljust(16, b'\0')
+        elif command == C.FACTORY_RESET:
+            self.__init__()
+        else:
+            raise TimeoutError('Nicht unterstützte Demo-Abfrage')
+        return b''
+
+    def close(self):
+        pass