Maximum send file size in SwiftSocket

Question

I want to send a file to iPhone using SwiftSocket. But the maximum size of the sent file is 132 kb.

I want to know what is the limitation for iOS or SwiftSocket?

How to increase the file size limit?

Code for calling the method Send:

switch client.send(data: myData) {
    case .success:
        return readResponse(from: client)
    case .failure(let error):
        appendToTextField(string: String(describing: error))
        return nil
    }

I debugged it. The data sent to the SwiftSocket method Sendis equal to the size of the file and it seems to receive the entire file. I can not find a bottleneck.