sending the encoded buffer over UART the python func ParseFromString fails

[Yarden Regev]

Hello,

I am trying to transfer message from type loggerMessage from C to python over UART:

 
        status = pb_encode(&stream, loggerMessage_fields, &message);
        message_length = stream.bytes_written;
        int i=0;
        printf("\r\n");

        for (i = 0; i <message_length; ++i) {
           printf("%x",buffer[i]);
        }

In python when reading this and converting to binary, ParseFromString throws google.protobuf.message.DecodeError: Error parsing message:

    log = loggerMessage_pb2.loggerMessage()

    binary_str = binascii.unhexlify(answer)

    log.ParseFromString((binary_str))

What is the problem with the way I am sending/receiving?

[Yarden Regev]

Note: after trying to encode the same structure through the python API (SerializeToString),  I noticed there was only a slight difference between the API's output and the output I get from the c file.

C:

a481e100102181201032d496d2053657269616c697a6564

API: 

0a04081e1000100218012010320d496d2053657269616c697a6564

As you can see there are some missing 0's, I would like to know what is wrong with the encoding I am doing on my C file

ב-יום שני, 20 במרץ 2023 בשעה 16:24:09 UTC+2, Yarden Regev כתב/ה: