Python newline \r\n problems

[Matthew Walker]

Hi all,

Trying to push data via USB serial onto python application. Fails intermittently seemingly only ever due to the \r\n combination found within the received bytes (shown below).

Any ideas whats going on here?

Code snippet from application:

            len_ = ser.read_until(size = 2)
            # Unpack as uint16 with big endianness
            bytes_to_read = struct.unpack('>H',len_)[0]
            print("PB bytes incoming: {}".format(bytes_to_read))
            message = bytearray(ser.read(size=bytes_to_read))
            print(message)
            print(message.hex(' '))
            print(len(message))
            try:
                telemetry.ParseFromString(message)
            except:
                 print("Bad decode!")

Cheers,

Matt.                  

[Matthew Walker]

More investigation. Its definitely \r\n that causes this, or specifically the hexadecimal 0d 0a. Whenever this is received in this combination the ParseFromString falls over. Any ideas? I've got no print statements in the C that is sending this binary over USB, and these are received mid message, I suspect due to the line-up of bytes.