bleak.exc.BleakError: Characteristic 0000a001-0000-1000-8000-00805f9b34fb does not support write operations!

[LudoM9]

Hi,

I have this writing issue when I try to change the device mode low power or normal.

Here is the python code I'm using :

  self.device = CalypsoDeviceApi(ble_address=self.ble_address)
  self.device.settings.ble_discovery_timeout = bleDiscoveryTimeout
  self.device.settings.ble_connect_timeout = bleConnectTimeout
  print("Establishing connection with Calypso...")
  self.deviceConnected = False
  i = 1
  attempts = 10
  while not self.deviceConnected and i <= attempts:
      try:
          await self.device.connect()
          self.deviceConnected = True
          print("Connection established Calypso: True")
      except:
          print(f"Connection established Calypso: False {i}/{attempts}")
          i+=1
  await self.device.about()
  await self.device.set_mode(CalypsoDeviceMode.LOW_POWER)

Here is the result :

Establishing connection with Calypso...
TimeoutError: 
Connection established Calypso: False 1/10
TimeoutError: 
Connection established Calypso: False 2/10
Connection established Calypso: True
{
  "info": {
    "ble_address": "E2:7C:BD:0A:22:B6",
    "manufacturer_name": "CALYPSO",
    "model_number": "UP10",
    "serial_number": "22:7C:BD:A:22:B6",
    "hardware_revision": "",
    "firmware_revision": "0.70",
    "software_revision": ""
  },
  "status": {
    "mode": "SLEEP",
    "rate": "HZ_4",
    "compass": "OFF"
  }
}

File "/home/ludom/Rob_Cours/aston-autonomous-sailboat-2023/ASTON2023/Drivers/Calypso/calypso.py", line 161, in _initialization
    await self.device.set_mode(CalypsoDeviceMode.LOW_POWER)        
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/ludom/pyenv/aston/lib/python3.11/site-packages/calypso_anemometer/core.py", line 208, in set_mode
    await self.client.write_gatt_char(
  File "/home/ludom/pyenv/aston/lib/python3.11/site-packages/bleak/__init__.py", line 659, in write_gatt_char
    await self._backend.write_gatt_char(char_specifier, data, response)
  File "/home/ludom/pyenv/aston/lib/python3.11/site-packages/bleak/backends/bluezdbus/client.py", line 854, in write_gatt_char
    raise BleakError(
bleak.exc.BleakError: Characteristic 0000a001-0000-1000-8000-00805f9b34fb does not support write operations!

If anyone knows how to solve this issue, please share it.