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How fast are orders executed How fast are orders executed compared to FIX APIs

The package Google.ProtocolBuffers 2.6 targets the .NET Framework 4.6, is it possible to upgrade this example to work with .NET Standard?

This code
txtMessages.Text += "Send: " + OpenApiMessagesPresentation.ToString(msg);
txtMessages.Text += Environment.NewLine;
It is better to write this way：
txtMessages.AppendText("Send: " + OpenApiMessagesPresentation.ToString(msg) + Environment.NewLine);

After the textbox appended text, it will stay in the first line.
It is not convenient to observe the information.
After rewriting, it will stay in the last line.

Hi, I am trying to repeat the examples but in Rust an faced a little issue that i cannot find following.
In tutorial it is said that message frame structure is following

 +--------------------------+-----------------------------------------+  
 | Message Length (4 bytes) | Serialized ProtoMessage object (byte[]) |  
 +--------------------------+-----------------------------------------+  
                            |<---------- Message Length ------------->|

But i cannot find is method length is Big or Little Endian.
I've tried both variant and both gives me empty response
for example i am sending following message

let msg = ProtoOAGetAccountListByAccessTokenReq{
        payloadType: ProtoOAPayloadType::PROTO_OA_GET_ACCOUNTS_BY_ACCESS_TOKEN_REQ,
        accessToken: Cow::from(ACCESS_TOKEN),
    };

and then i can get a response and decode it but a structure has empty(default) fields

ProtoOAGetAccountListByAccessTokenRes {
    payloadType: PROTO_OA_GET_ACCOUNTS_BY_ACCESS_TOKEN_RES,
    accessToken: "",
    permissionScope: None,
    ctidTraderAccount: [],
}

when I read from stream

let mut length: [u8; 4] = [0x00; 4];
    stream.read_exact(&mut length)?;
    println!("received bytes = {:?}, length = {:?}", length, i32::from_le_bytes(length));

I get following bytes and converted into length

received bytes = [21, 3, 1, 0], length = 66325

that is i am receiving some response, but it looks like it is empty(default) response message

could you help me with this?
Thank you.

Do all brokers cTrades allow connection to a Fix APIs In real accounts ? (Fondex ,FxPro,Pepperstone ,RoboForex ,IC Market ,...)
Without personal confirmation from them via Email ?