B4R Question B4XSerializator Home Assistant Issues

[rwblinn]

Hi,

trying to implement the Python B4XSerializator (b4x_serializer.py) in Home Assistant with ESP32 BLE (B4R) bi-directional communication.
B4R Type

Type TServerData (Temperature As Int, Humidity As Int, Command As Int, CommandData As Int)

Python DataClass

class ServerData: temperature: int  humidity: int command: int  commanddata: int

Any help appreciated.

Issues
HA receives serialized data, but can not parse

[BLE_SERVER_DHT][process_data] Raw data received: 7E04028606020D1A04FF04FF7F
[BLE_SERVER_DHT][process_data] Error deserializing B4X data: Error -3 while decompressing data: incorrect header check

HA sends data, but B4R receives wrong format

[BLEServer_NewData] buffer=789C9360E4666060882F4E2D2A4B2D4A492C49640172C16225A9B905A9458925A545A9CC0C20410E2091519A9B999259520911610712C9F9B9B9897929CC4C307D50019059605500099A1463, len=76 bytes

B4R Code Snippet Advertise to HA

Type TServerData (Temperature As Int, Humidity As Int, Command As Int, CommandData As Int)
Private ServerData As TServerData
Advertise to HA
ServerData.Temperature = DHT.GetTemperature * 100
ServerData.Humidity = DHT.GetHumidity * 100
ServerData.Command = -1
ServerData.CommandData = -1

'Advertise as serialized objects
Dim data() As Byte = ser.ConvertArrayToBytes(Array(ServerData.Temperature, ServerData.Humidity, ServerData.Command, ServerData.CommandData))
BLEServer_Write(data)

Data advertised:

[TimerDataAdvertising_Tick] data=7E04028606020D1A04FF04FF7F

HA Code Snippets
const.py

@dataclass
class ServerData:
    temperature: int
    humidity: int
    command: int
    commanddata: int

ble_client.py

# Get the global B4X serializer instance
serializer = B4XSerializator(types=[ServerData])
if serializer is None:
    _LOGGER.error(f"{LOGGING_PREFIX}[process_data] B4XSerializer not initialized!")
    return
# Deserialize Objects Received from B4R
try:
    sensor_data = serializer.convert_bytes_to_object(raw_data)
except Exception as e:
    _LOGGER.error(f"{LOGGING_PREFIX}[process_data] Error deserializing B4X data: {e}")
    return
# Assign the objects
temperature = sensor_data.temperature / 100
humidity = sensor_data.humidity / 100
_LOGGER.info(f"{LOGGING_PREFIX}[process_data] Received Temperature: {temperature}°C, Humidity: {humidity}%")

# Serialize Objects send to B4R
# Get the global B4X serializer instance
serializer = B4XSerializator(types=[ServerData])
if serializer is None:
    _LOGGER.error(f"{LOGGING_PREFIX}[write_led_state] B4XSerializer not initialized!")
    return
try:
    serobj = ServerData(temperature=0, humidity=0, command=led, commanddata=state)
    data = serializer.convert_object_to_bytes(obj=serobj)
    await asyncio.sleep(0.1)
    await self._client.write_gatt_char(CHARACTERISTICS_UUID, data)
    _LOGGER.info(f"{LOGGING_PREFIX}[write_led_state] LED state written: " + ", ".join(f"0x{b:02X}" for b in data))
except Exception as e:
    _LOGGER.error(f"{LOGGING_PREFIX}[process_data] Error deserializing B4X data: {e}")
    return
[CODE=b4x]

 

[Erel]

You will not be able to send custom types.
You should instead use B4RSerializator which is less powerful but works with B4R. It shouldn't be too difficult to implement it in Python. I can help if needed.

 

[rwblinn]

Thanks, but the data sent / received are not custom types, but 4 ints using the B4RSerializer from the ESP32 and the B4XSerializer.py from Home Assistant.

Temperature As Int, Humidity As Int, Command As Int, CommandData As Int

B4R > HA (log message HA, b4xserializer.py)
[BLE_SERVER_DHT][process_data] Raw data received: 7E04028606020D1A04FF04FF7F
[BLE_SERVER_DHT][process_data] Error deserializing B4X data: Error -3 while decompressing data: incorrect header check

HA > B4R (log message B4R, b4rserializer)
[BLEServer_NewData] buffer=789C9360E4666060882F4E2D2A4B2D4A492C49640172C16225A9B905A9458925A545A9CC0C20410E2091519A9B999259520911610712C9F9B9B9897929CC4C307D50019059605500099A1463, len=76 bytes

 

[Erel]

B4RSerializator <> B4XSerializator. Different format. It will require implementing it in Python.