How does the client obtain data from the scrcpy service started on the mobile phone?

[HitomiHong]

• [ yes ] I have read the FAQ.
• [ yes ] I have searched in existing issues.

Environment

• OS: Windows
• scrcpy version: 1.18
• installation method: [e.g. manual build, apt, snap, brew, Windows release...]
• device model: Oppo Reno ACE
• Android version: 10

Describe the bug

Hello, I pushed the scrcpy server to the Android phone and started the service.

It looks like the service is indeed started.

[server] INFO: Device: OPPO PCLM10 (Android 10)

I wrote a simple client to get the data pushed by the service, but I can only get dummy byte.

data == >  b'\x00'

The following is the client code I wrote. I wonder if you can help me find out why I can’t get the subsequent data. These three methods are called from top to bottom.

def client_socket():
    # client socket
    client: socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    server_addr = ('127.0.0.1', 27183)
    client.connect(server_addr)

    data = client.recv(1)
    if not len(data):
        raise IOError('no data')
    print('data == > ', data)

    data = client.recv(64).decode("utf-8").rstrip("\x00")
    print('data == > ', data)

    data = client.recv(4).decode("utf-8").rstrip("\x00")
    print('data == > ', data)

In addition, this is my process of pushing the scrcpy service

def push_scrcpy():
    """
    push scrcpy.jar
    """
    # push file to /data/local/tmp
    cmd = r'adb push E:\MySoftware\scrcpy-server.jar /data/local/tmp/scrcpy-server.jar'
    process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    stdout, stderr = process.communicate()

    if process.returncode == 0:
        print('push successfully')

    else:
        print("push error")
        print("error:", stderr.decode())

def forward_scrcpy():
    """
    forward
    """
    cmd = 'adb forward tcp:27183 localabstract:scrcpy'
    try:
        output = subprocess.call(cmd)
        # output = output.decode('utf-8')
        print(output)
    except subprocess.CalledProcessError as e:
        print('forward error:', e)

def start_scrcpy_android():
    """
    start scrcpy server
    """
    cmd = ('adb shell CLASSPATH=/data/local/tmp/scrcpy-server.jar app_process / com.genymobile.scrcpy.Server 1.18 info '
           '1600 20000000 0 -1 true - false true 0 false false - - false')

    process = subprocess.Popen(cmd)
    process.wait()
    print('scrcpy-server end')

Looking forward to your answer very much

[rom1v]

Please read: https://github.com/Genymobile/scrcpy/blob/master/doc/develop.md#protocol