Python3 input() break when incoming message is received

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Python

What I'm looking to do is wait for a user input to send commands to a server. However, as input() is a blocking statement, I want to exit out of that statement if an incoming message from the server is received.

Currently I have two threads.

Thread 1:

def user_input():
    global terminate
    global cmd

    while True:
        time.sleep(10)
        tLock.acquire()
        uInput = input("Enter: ")
        if(uInput == "1"):
            terminate = 1
            break
        if uInput == "2":
            mySock.mysend(cmd.getShutdown())
        if uInput == "3":
            mySock.mysend(cmd.getStartUp())
        if uInput == "4":
            mySock.mysend(cmd.getReset())

        tLock.release()

Thread 2:

tLock.acquire()
    mySock = MySocket()
    mySock.connect()
    tLock.release()
    s1 = threading.Thread(target=user_input)
    s1.start()

    while(1):

        if mySock.dataCheck():
            tLock.acquire()
            incoming = mySock.myreceive()

            if len(incoming) > 0:
                
                print("Incoming: ", incoming)
                tLock.release()
                out = cmd.parse(incoming)

                if len(out) > 0:
                    tLock.acquire()
                    mySock.mysend(out)
                    tLock.release()

        if(terminate):
            break

What I have tried:

I know I can generate a signal using signal() to create a timeout for input, but I would like to generate a signal when

if mySock.dataCheck():

is tripped. This function checks if there is any data is incoming. At that point I want to exit the input() statement and then lock out the input thread. I want to get rid of the 10 second delay I'm using to wait for any incoming messages.

Any insight?