This is a single file library which is handy when dissecting custom protocols over UDP. Given a list of ports to bind to, UdpRecv will set up sockets accordingly and proceed to trigger callbacks on every packet received.
A simple example would be to simply pretty print the contents of each packet received over a range of ports:
from udprecv import UdpRecv
from pprint import pprint
recv = UdpRecv(range(1900, 1910))
test.add_callback(lambda src, msg: pprint(msg))
test.start()
test.join()
A reader function can be provided in order to parse the received packet data before the callback is called:
import json
recv = UdpRecv([666,])
test.add_reader(json.loads)
test.add_callback(lambda src, msg: json.dumps(msg))
For a more fleshed out example of the above use case, take a look at jsonrecv, a command line tool to pretty print JSON packets arriving over UDP.
When adding callbacks, a filter function can be provided to limit what incoming messages get processed. The below example calls handle_func whenever the JSON object has a field type equal to value:
test.add_reader(json.loads)
test.add_callback(handle_func, lambda x: x.get('type') == 'value')
UdpRecv is written with IPv6 in mind, and supports IPv4 seamlessly by mapping IPv4 addresses to IPv6. By default, UdpRecv binds to all addresses (::, the IPv6 equivalent of 0.0.0.0).