CODEWITHSUNDEEP
iosgcdasyncsocket
MohamMad Salah
MohamMad Salah

Reputation: 981

GCDAsyncSocket doesn't write once the socket is connected

In my iOS App I use GCDAsyncSocket library to communicate with a local server running on another iPad. So multiple iPads communicate with each other locally, and one of them acts as a server.

When a client connects to the server iPad the following GCDAsyncSocketDelegate triggers: 

func socket(_ sock: GCDAsyncSocket, didConnectToHost host: String, port: UInt16) {
    sock.readData(toLength: UInt(UInt64.byteWidth), withTimeout: -1, tag: 0)
    delay(0.1, queue: socket.delegateQueue, closure: { [weak self] in
        sock.write(dataToSend, withTimeout: -1, tag: 0)
    })

    connected = true
}

Once the client is connected to the server, it writes some data to that socket (server), however, this data doesn't reach the server. But, if I wrap the write call in a delay function then the data will reach its destination.

Here is my delay function:

func delay(_ delay: Double, queue: DispatchQueue?, closure: @escaping () -> ()) {
    let delayTime = DispatchTime.now() + Double(Int64(delay * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC)
    let q = queue ?? DispatchQueue.global()
    q.asyncAfter(deadline: delayTime) {
        closure()
    }
}

What I am missing here?

Upvotes: 0

Views: 149

Answers (0)

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