Fix COHN cert default value, useful for multiple camera

demos/python/sdk_wireless_camera_control/open_gopro/demos/gui/livestream.py

@@ -70,6 +70,7 @@ def parse_arguments() -> argparse.Namespace:
     parser.add_argument("ssid", type=str, help="WiFi SSID to connect to.")
     parser.add_argument("password", type=str, help="Password of WiFi SSID.")
     parser.add_argument("url", type=str, help="RTMP server URL to stream to.")
+    parser.add_argument("identifier", type=str, help="GoPro identifier.")
     parser.add_argument("--min_bit", type=int, help="Minimum bitrate.", default=1000)
     parser.add_argument("--max_bit", type=int, help="Maximum bitrate.", default=1000)
     parser.add_argument("--start_bit", type=int, help="Starting bitrate.", default=1000)

demos/python/sdk_wireless_camera_control/open_gopro/gopro_wireless.py

@@ -443,8 +443,10 @@ async def wait_for_cohn_ready(_: Any, status: proto.NotifyCOHNStatus) -> None:
             logger.info("Waiting for COHN to be connected")
             await self.ble_command.cohn_get_status(register=True)
             ip_address, password = await asyncio.wait_for(credentials.get(), timeout)
+            hardware_info = await self.ble_command.get_hardware_info()
+            serial_number = hardware_info.data.serial_number
             cert = (await self.ble_command.cohn_get_certificate()).data.cert
-            self._cohn = CohnInfo(ip_address, "gopro", password, cert)
+            self._cohn = CohnInfo(ip_address, "gopro", password, cert,f"cohn_{serial_number}.crt")
             logger.info(f"Using COHN Credentials: {self._cohn}")
             return True
         except TimeoutError:

demos/python/sdk_wireless_camera_control/open_gopro/models/general.py

@@ -70,7 +70,7 @@ class CohnInfo:
     username: str
     password: str
     certificate: str
-    cert_path: Path = Path("cohn.crt")
+    cert_path: Path 
 
     def __post_init__(self) -> None:
         token = b64encode(f"{self.username}:{self.password}".encode("utf-8")).decode("ascii")