serial sync recv interval

[banana-sun]

The stress test: I used FUNC code 0x15 to transmit the file, tested it 30 times with different baud rates, and found no incomplete received frames.
RTU function unavailable: Compared with the modified file, in the original processing, we can see that the size has been modified in ModbusSerialClient/recv. This will lead to later check errors, resulting in RTU function unavailable. There is no log now. The source code check (pymodbus/transaction. py/ModbusTransactionManager/_recv) is attached.

            read_min = self.client.framer.recvPacket(min_size)
            if len(read_min) != min_size:
                msg_start = "Incomplete message" if read_min else "No response"
                raise InvalidMessageReceivedException(
                    f"{msg_start} received, expected at least {min_size} bytes "
                    f"({len(read_min)} received)"
                )

[janiversen]

you still have a formatting issue (black).

[banana-sun]

I think running ./check_ci.sh requires some environment.
./check_ci.sh: line 8: codespell: command not found "codespell" command filed with exit code 127.

[janiversen]

Well it does expect you to read the README, and install requirements.txt, as this is needed for all development in this project.

[janiversen]

LGTM, thanks.