fix modbus function

boneio/modbus.py

@@ -93,10 +93,33 @@ def _pymodbus_connect(self) -> bool:
  _LOGGER.error(exception_error)
  return False
 
+ async def read_single_register(
+ self, unit: int, address: int, count: int = 2, method: str = "input"
+ ) -> float | None:
+ """Call sync. pymodbus."""
+ async with self._lock:
+ if not self._pymodbus_connect():
+ _LOGGER.error("Can't connect to Modbus address %s.", address)
+ return None
+ kwargs = {"unit": unit, "count": count} if unit else {}
+ try:
+ result: ReadInputRegistersResponse = self._read_methods[method](
+ address, **kwargs
+ )
+ except ModbusException as exception_error:
+ _LOGGER.error(exception_error)
+ return None
+ if not hasattr(result, REGISTERS):
+ _LOGGER.error(str(result))
+ return None
+ return BinaryPayloadDecoder.fromRegisters(
+ result.registers, byteorder=Endian.Big, wordorder=Endian.Big
+ ).decode_32bit_float()
+
  async def read_multiple_registers(
  self, unit: int, address: int, count: int = 2, method: str = "input"
  ) -> ModbusResponse:
- """Read single or multiple register(s)."""
+ """Call sync. pymodbus."""
  async with self._lock:
  if not self._pymodbus_connect():
  _LOGGER.error("Can't connect to Modbus.")

boneio/version.py

@@ -1,2 +1,2 @@
 # flake8: noqa
-__version__ = "0.7.2dev3"
+__version__ = "0.7.2dev4"