Optional attributes' values are not cleared

[Yasmine Safi]

Hello,

I am not sure if this is the right place to ask this question.
we are currently running a python application that receives json messages, parse it according to the given dict using ParseDict , serialize it SerializeToString and send it.

# encode.py
payload = ParseDict(data, data_t_v1())
raw_payload = payload.SerializeToString()

This what we have in proto file:

//data.proto syntax = "proto2";

message data_t_v1 {
 required uint32 id = 1;
 optional uint32 offset = 2;
 optional uint32 multiplier = 3;
 optional uint32 mask = 4;
 }

However, I have an issue concerning the values of optional attributes. Here is what happens:
Step 1- sending the message with the optional values

data = {
"id": 1,
"offset": 2,
"multiplier":10,
"mask": 4294967295 }

Step 2- sending the same message without the optional values

data = {
"id": 1 }

The issue happens here: ParseDict is returning a dict with the optional attributes having the old value that I set in step 1.

I would like to know if there is a way to clear old optional values when they are not set.
Thanks in advance. and Please let me know if you need additional information