如何在一个端口上侦听并同时从另一个端口广播？ 蟒蛇

Question

I have a python script which works very well at listening for a UDP packet on a port. I already know how to broadcast a UDP packet but the design of my software would require me to be able to listen for a UDP packet and broadcast them at the same time.

How can I listen on one port for UDP packets, whilst the program continues, ultimatly resulting broadcasting of packets?

Simply put, I would like my listening loop....

    print("Listening on port: " + str(self.recvPort))
    while 1:
        data = inSoc.recv(65536)  # 16 bytes
        # Recived some data from the server, Can PROCCESS NOW!
    if not data:
        pass
    else:
        print("Data has arrived!")
        print("[Data] : ", data)

... to continuously run in the background while the script continues its other tasks, one being to broadcast out on a different port.

I know this should be relational to threading, _thread or async however I am unable to get these to work?

I named the loop an async def but it failed due to not having an await

Answer 1

You wouldn't inherently need threading to solve this. I think you should have a look at select https://docs.python.org/2/library/select.html

then you could do something like:

while 1:
    read, _, _ = select.select([inSoc],[],[], 0)
    #if insoc has something for you to read
    for soc in read:
        data = soc.recv(65536)
    #do something else