[Windows 10] Serial error: FileNotFoundError

Hi. I am trying to subscribe to the GATT data of the MAXREFDES103 eval product from Maxim/ADI. I am able to connect through the native GUI but I receive an error when attempting to connect to the device via ble-serial v. 2.6. I am on Windows 10 and have onboard bluetooth.

`Started deep scan of 80:6F:B0:DA:24:C5`

`Found device 80:6F:B0:DA:24:C5: HSP2SPO2_3_4.6 (out of 1)`
`SERVICE 00001800-0000-1000-8000-00805f9b34fb (Handle: 1): Generic Access Profile`
    ` CHARACTERISTIC 00002a00-0000-1000-8000-00805f9b34fb (Handle: 2):  ['read']`
    ` CHARACTERISTIC 00002a01-0000-1000-8000-00805f9b34fb (Handle: 4):  ['read']`
     `CHARACTERISTIC 00002a04-0000-1000-8000-00805f9b34fb (Handle: 6):  ['read']`
`SERVICE 00001801-0000-1000-8000-00805f9b34fb (Handle: 8): Generic Attribute Profile`
    ` CHARACTERISTIC 00002a05-0000-1000-8000-00805f9b34fb (Handle: 9):  ['indicate']`
`SERVICE 00001523-1212-efde-1523-785feabcd123 (Handle: 11): Nordic LED Button Service`
    ` CHARACTERISTIC 00001027-1212-efde-1523-785feabcd123 (Handle: 12):  ['read', 'write']`
     `CHARACTERISTIC 00001011-1212-efde-1523-785feabcd123 (Handle: 14):  ['notify']`
         `DESCRIPTOR 00002902-0000-1000-8000-00805f9b34fb (Handle: 16): Client Characteristic Configuration`
`SERVICE 0000180d-0000-1000-8000-00805f9b34fb (Handle: 17): Heart Rate`
     `CHARACTERISTIC 00002a37-0000-1000-8000-00805f9b34fb (Handle: 18):  ['notify']`
        ` DESCRIPTOR 00002902-0000-1000-8000-00805f9b34fb (Handle: 20): Client Characteristic Configuration`

`Completed deep scan of 80:6F:B0:DA:24:C5`

`Finished BLE scan`

`C:\Users\...>ble-serial -d 80:6F:B0:DA:24:C5`
`23:11:29.175 | INFO | ble_interface.py: Receiver set up`
`23:11:29.176 | ERROR | main.py: Unexpected Error: SerialException("could not open port '\\\\\\\\.\\\\BLE': FileNotFoundError(2, 'The system cannot find the file specified.', None, 2)")`
`23:11:29.177 | WARNING | main.py: Shutdown initiated`
`23:11:29.178 | INFO | main.py: Shutdown complete.`

I am not sure what causes this error in the third to last line. Can someone help me out?

Also, when I attempt to install the BLE tools as specified at https://github.com/Jakeler/ble-serial/blob/master/README.md I only get to the part where the prompt responds with “Ok.” A new window quickly opens and closes but I don’t see anything. I do have the com0com utility installed in Program Files (x86).

[Jakeler]

See the README, especially the section about finding an connecting a device, there is also a list. Only option for writing on this device is the LED Button Service. I am not sure if that is what you want to do with it. For just reading the heart rate or something you might also disable writing with --permit ro, note that you anyway have to specify the read characteristic, as this is non standard profile.

I am closing this again, since it is getting off topic and the original issue is solved. Feel free to open a new discussion thread if you still have questions about characteristics etc.

[earubin]

No I did not, That got rid of the weird path issue with \\.\BLE. Unfortunately, I now have an issue with the device not having a write characteristic. Do you have the link to the file with all the BLE characteristics?

Error for reference: 18:26:16.759 | ERROR | main.py: Unexpected Error: AssertionError("No characteristic in builtin write list ['0000ff01-0000-1000-8000-00805f9b34fb', '0000ff02-0000-1000-8000-00805f9b34fb', '0000ffe1-0000-1000-8000-00805f9b34fb'] found!\n Please specify one with -w/--write-uuid, see also --help")